FileIOPermission-Klasse

Steuert den Zugriff auf Dateien und Ordner. Diese Klasse kann nicht vererbt werden.

Namespace: System.Security.Permissions
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class FileIOPermission
    Inherits CodeAccessPermission
    Implements IUnrestrictedPermission
'Usage
Dim instance As FileIOPermission

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public sealed class FileIOPermission : CodeAccessPermission, IUnrestrictedPermission

[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class FileIOPermission sealed : public CodeAccessPermission, IUnrestrictedPermission

/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class FileIOPermission extends CodeAccessPermission implements IUnrestrictedPermission

SerializableAttribute 
ComVisibleAttribute(true) 
public final class FileIOPermission extends CodeAccessPermission implements IUnrestrictedPermission

Hinweise

Diese Berechtigung unterscheidet zwischen den folgenden vier Typen von E/A-Dateizugriff, die durch FileIOPermissionAccess bereitgestellt werden:

• Read: Lesezugriff auf den Dateiinhalt oder auf Informationen über die Datei, z. B. deren Größe oder den Zeitpunkt der letzten Änderung.

• Write: Schreibzugriff auf den Inhalt der Datei oder auf Informationen über die Datei, um z. B den Dateinamen ändern zu können. Lässt außerdem Löschen und Überschreiben zu.

• Append: Nur die Möglichkeit zum Schreiben am Dateiende. Kein Lesezugriff.

• PathDiscovery: Zugriff auf die Informationen im Pfad selbst. Dies schützt vertrauliche Informationen im Pfad, z. B. Benutzernamen, oder Informationen zur Verzeichnisstruktur, die im Pfad erkennbar sind. Dieser Wert gewährt keinen Zugriff auf Dateien oder Ordner, die durch den Pfad dargestellt werden.

Alle diese Berechtigungen sind von einander unabhängig. Dies bedeutet, dass ein bestimmter Typ von Zugriffsberechtigung keine andere Berechtigung voraussetzt. Eine Write-Berechtigung z. B. setzt keine Read-Berechtigung oder Append-Berechtigung voraus. Wenn mehrere Berechtigungen gewährt werden sollen, können diese mithilfe der bitweisen OR-Operation verknüpft werden, wie im folgenden Codebeispiel gezeigt. Dateiberechtigungen werden in Form von eindeutigen, absoluten Pfaden definiert. Aufrufe sollten immer mit eindeutigen Dateipfaden durchgeführt werden.

FileIOPermission beschreibt geschützte Operationen für Dateien und Ordner. Die File-Klasse bietet sicheren Zugriff auf Dateien und Ordner. Die Sicherheitsüberprüfung des Zugriffs erfolgt bei der Erstellung des Handles für die Datei. Die sich aus der Sicherheitsüberprüfung ergebende Leistungsbeeinträchtigung wird verringert, wenn die Überprüfung zur Erstellungszeit durchgeführt wird. Das Öffnen einer Datei ist ein einmaliger Vorgang, während Lese- und Schreibvorgänge in einer geöffneten Datei mehrmals erfolgen können. Sobald die Datei geöffnet ist, werden keine weiteren Überprüfungen durchgeführt. Das Objekt wird möglicherweise missbraucht, wenn es an einen nicht vertrauenswürdigen Aufrufer übergeben wird. Dateihandles sollten z. B. nicht in öffentlichen globalen statischen Feldern gespeichert werden, in denen Code mit geringeren Berechtigungen auf die Handles zugreifen kann.

FileIOPermissionAccess gibt Aktionen an, die für die Datei oder den Ordner ausgeführt werden können. Darüber hinaus können diese Aktionen mit der bitweisen OR-Operation zu komplexen Instanzen verbunden werden.

Beim Zugriff auf einen Ordner wird ebenfalls der Zugriff auf die darin enthaltenen Dateien sowie auf sämtliche Dateien und Ordner in den untergeordneten Ordnern gewährt. Beispielsweise wird beim Read-Zugriff auf C:\Ordner1\ auch Read-Zugriff auf C:\Ordner1\Datei1.txt, C:\Ordner1\Ordner2\, C:\Ordner1\Ordner2\Datei2.txt usw. gewährt.

Beispiel

Die folgenden Beispiele veranschaulichen den von FileIOPermission verwendeten Code. Nach den folgenden beiden Zeilen Code stellt das Objekt f die Berechtigung zum Lesen aller Dateien auf den lokalen Datenträgern des Clientcomputers dar.

Dim f As New FileIOPermission(PermissionState.None)
f.AllLocalFiles = FileIOPermissionAccess.Read

FileIOPermission f = new FileIOPermission(PermissionState.None);
f.AllLocalFiles = FileIOPermissionAccess.Read;

FileIOPermission^ f = gcnew FileIOPermission( PermissionState::None );
f->AllLocalFiles = FileIOPermissionAccess::Read;

FileIOPermission f = new FileIOPermission(PermissionState.None);
f.set_AllLocalFiles(FileIOPermissionAccess.Read);

Nach den folgenden beiden Zeilen Code stellt das Objekt f2 die Berechtigung zum Lesen von C:\test_r und zum Lesen und Schreiben in C:\example\out.txt dar. Read und Write stellen die Berechtigungen für Dateien und Ordner wie bereits beschrieben dar.

Dim f2 As New FileIOPermission(FileIOPermissionAccess.Read, "C:\test_r")
f2.AddPathList(FileIOPermissionAccess.Write Or _
   FileIOPermissionAccess.Read, "C:\example\out.txt")

FileIOPermission f2 = new FileIOPermission(FileIOPermissionAccess.Read, "C:\\test_r");
f2.AddPathList(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, "C:\\example\\out.txt");

FileIOPermission^ f2 = gcnew FileIOPermission( FileIOPermissionAccess::Read,"C:\\test_r" );
f2->AddPathList( (FileIOPermissionAccess) (FileIOPermissionAccess::Write | FileIOPermissionAccess::Read), "C:\\example\\out.txt" );

FileIOPermission f2 = 
    new FileIOPermission(FileIOPermissionAccess.Read, "C:\\test_r");
f2.AddPathList(FileIOPermissionAccess.Write | 
    FileIOPermissionAccess.Read, "C:\\example\\out.txt");

Im folgenden Beispiel werden viele der FileIOPermission-Member veranschaulicht.

Imports System
Imports System.Security
Imports System.Security.Permissions
Imports System.Collections
Imports Microsoft.VisualBasic

<Assembly: CLSCompliant(True)> 

Public Class FileIOPermissionDemo

    ' IsSubsetOf determines whether the current permission is a subset of the specified permission.
    ' This method compares various FileIOPermission paths with FileIOPermissionAccess set to AllAccess.
    Private Function IsSubsetOfDemo() As Boolean

        Dim returnValue As Boolean = True
        Dim fileIO1 As String = ""
        Dim fileIO2 As String = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission

        Dim fileIOGen1 As New FileIOGenerator()
        Dim fileIOGen2 As New FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess, fileIO1)
            End If

            Console.WriteLine("**********************************************************" & ControlChars.Lf)

            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)
                If fileIO2 = "" Then
                    fileIOPerm2 = New FileIOPermission(PermissionState.None)
                Else
                    fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.AllAccess, fileIO2)
                End If
                Dim firstPermission As String = IIf(fileIO1 = "" Or fileIO1 Is Nothing, "null", fileIO1)
                Dim secondPermission As String = IIf(fileIO2 = "" Or fileIO2 Is Nothing, "null", fileIO2)
                If fileIOPerm2 Is Nothing Then
                    GoTo ContinueWhile2
                End If
                Try
                    If fileIOPerm1.IsSubsetOf(fileIOPerm2) Then

                        Console.WriteLine((firstPermission & " is a subset of " & secondPermission & ControlChars.Lf))
                    Else
                        Console.WriteLine((firstPermission & " is not a subset of " & secondPermission & ControlChars.Lf))
                    End If

                Catch e As Exception
                    Console.WriteLine(IIf("An exception was thrown for subset :" & fileIO1 = "", "null", IIf(fileIO1 & ControlChars.Lf & fileIO2 = "", "null", fileIO2 & ControlChars.Lf & e.ToString())))
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While
        Return returnValue
    End Function 'IsSubsetOfDemo

    ' Union creates a new permission that is the union of the current permission and the specified permission.
    Private Function UnionDemo() As Boolean

        Dim returnValue As Boolean = True

        Dim fileIO1 As String = ""
        Dim fileIO2 As String = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission
        Dim fileIOPerm3 As IPermission

        Dim fileIOGen1 As New FileIOGenerator()
        Dim fileIOGen2 As New FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read, fileIO1)
            End If
            Console.WriteLine("**********************************************************" & ControlChars.Lf)
            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)

                Try
                    If fileIO2 = "" Then
                        fileIOPerm2 = New FileIOPermission(PermissionState.None)
                    Else
                        fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.Read, fileIO2)
                    End If
                    Dim firstPermission As String = IIf(fileIO1 = "" Or fileIO1 Is Nothing, "null", fileIO1)
                    Dim secondPermission As String = IIf(fileIO2 = "" Or fileIO2 Is Nothing, "null", fileIO2)
                    fileIOPerm3 = CType(fileIOPerm1.Union(fileIOPerm2), FileIOPermission)
                    fileIOPerm3 = fileIOPerm1.Union(fileIOPerm2)

                    If fileIOPerm3 Is Nothing Then
                        Console.WriteLine(("The union of " & firstPermission & "  and " & secondPermission & " is null."))
                    Else
                        Console.WriteLine(("The union of " & firstPermission & "  and " & secondPermission & " = " & ControlChars.Lf & ControlChars.Tab & CType(fileIOPerm3, FileIOPermission).GetPathList(FileIOPermissionAccess.Read)(0)))
                    End If
                Catch e As Exception
                    Console.WriteLine(("An exception was thrown for union " & e.ToString()))
                    returnValue = False
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While


        Return returnValue
    End Function 'UnionDemo

    ' Intersect creates and returns a new permission that is the intersection of the current 
    ' permission and the permission specified.
    Private Function IntersectDemo() As Boolean

        Dim returnValue As Boolean = True

        Dim fileIO1 As String = ""
        Dim fileIO2 As String = ""
        Dim fileIOPerm1, fileIOPerm2, fileIOPerm3 As FileIOPermission

        Dim fileIOGen1 As New FileIOGenerator()
        Dim fileIOGen2 As New FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read, fileIO1)
            End If
            Console.WriteLine("**********************************************************" & ControlChars.Lf)
            fileIOGen2.ResetIndex()

            While fileIOGen2.CreateFilePath(fileIO2)
                If fileIO2 = "" Then
                    fileIOPerm2 = New FileIOPermission(PermissionState.None)
                Else
                    fileIOPerm2 = New FileIOPermission(FileIOPermissionAccess.Read, fileIO2)
                End If
                Dim firstPermission As String = IIf(fileIO1 = "" Or fileIO1 Is Nothing, "null", fileIO1)
                Dim secondPermission As String = IIf(fileIO2 = "" Or fileIO2 Is Nothing, "null", fileIO2)
                Try

                    fileIOPerm3 = CType(fileIOPerm1.Intersect(fileIOPerm2), FileIOPermission)
                    If Not (fileIOPerm3 Is Nothing) AndAlso Not (fileIOPerm3.GetPathList(FileIOPermissionAccess.Read) Is Nothing) Then

                        Console.WriteLine(("The intersection of " & firstPermission & "  and " & ControlChars.Lf & ControlChars.Tab & secondPermission & " = " & ControlChars.Lf & ControlChars.Tab & CType(fileIOPerm3, FileIOPermission).GetPathList(FileIOPermissionAccess.Read)(0)))
                    Else
                        Console.WriteLine(("The intersection of " & firstPermission & "  and " & secondPermission & " is null."))
                    End If
                Catch e As Exception
                    Console.WriteLine(("An exception was thrown for intersection " & e.ToString()))
                    returnValue = False
                End Try
ContinueWhile2:
            End While
ContinueWhile1:
        End While

        Return returnValue
    End Function 'IntersectDemo

    'Copy creates and returns an identical copy of the current permission.
    Private Function CopyDemo() As Boolean
        Dim returnValue As Boolean = True
        Dim fileIO1 As String = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission
        Dim fileIOGen1 As New FileIOGenerator()
        Dim fileIOGen2 As New FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read, fileIO1)
            End If
            Console.WriteLine("**********************************************************" & ControlChars.Lf)
            fileIOGen2.ResetIndex()
            Try
                fileIOPerm2 = CType(fileIOPerm1.Copy(), FileIOPermission)
                If Not (fileIOPerm2 Is Nothing) Then
                    Console.WriteLine(("Result of copy = " & fileIOPerm2.ToString() & ControlChars.Lf))
                Else
                    Console.WriteLine("Result of copy is null. " & ControlChars.Lf)
                End If
            Catch e As Exception
                If (True.ToString()) Then
                    If fileIO1 = "" Then
                        Console.WriteLine("The target FileIOPermission is empty, copy failed.")

                    Else
                        Console.WriteLine(e.ToString())
                    End If
                End If
                GoTo ContinueWhile1
            End Try
ContinueWhile1:
        End While
        Return returnValue
    End Function 'CopyDemo

    ' ToXml creates an XML encoding of the permission and its current state; 
    ' FromXml reconstructs a permission with the specified state from the XML encoding. 
    Private Function ToFromXmlDemo() As Boolean

        Dim returnValue As Boolean = True

        Dim fileIO1 As String = ""
        Dim fileIOPerm1, fileIOPerm2 As FileIOPermission

        Dim fileIOGen1 As New FileIOGenerator()
        Dim fileIOGen2 As New FileIOGenerator()

        fileIOGen1.ResetIndex()
        While fileIOGen1.CreateFilePath(fileIO1)
            If fileIO1 = "" Then
                fileIOPerm1 = New FileIOPermission(PermissionState.None)
            Else
                fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.Read, fileIO1)
            End If
            Console.WriteLine("********************************************************" & ControlChars.Lf)
            fileIOGen2.ResetIndex()
            Try
                fileIOPerm2 = New FileIOPermission(PermissionState.None)
                fileIOPerm2.FromXml(fileIOPerm1.ToXml())
                Console.WriteLine(("Result of ToFromXml = " & fileIOPerm2.ToString() & ControlChars.Lf))

            Catch e As Exception
                Console.WriteLine(("ToFromXml failed :" & fileIOPerm1.ToString() & e.ToString()))
                GoTo ContinueWhile1
            End Try
ContinueWhile1:
        End While

        Return returnValue
    End Function 'ToFromXmlDemo

    ' AddPathList adds access for the specified files and directories to the existing state of the permission.
    ' SetPathList sets the specified access to the specified files and directories, replacing the existing state 
    ' of the permission.
    ' GetPathList gets all files and directories that have the specified FileIOPermissionAccess.
    Private Function SetGetPathListDemo() As Boolean
        Try
            Console.WriteLine("********************************************************" & ControlChars.Lf)

            Dim fileIOPerm1 As FileIOPermission
            Console.WriteLine("Creating a FileIOPermission with AllAccess rights for 'C:\Examples\Test\TestFile.txt")
            fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\Examples\Test\TestFile.txt")
            Console.WriteLine("Adding 'C:\Temp' to the write access list, and " & ControlChars.Lf & " 'C:\Examples\Test' to read access.")
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\Temp")
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\Examples\Test")
            Dim paths As String() = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
            Console.WriteLine("Read access before SetPathList = ")
            Dim path As String
            For Each path In paths
                Console.WriteLine((ControlChars.Tab & path))
            Next path
            Console.WriteLine("Setting the read access list to " & ControlChars.Lf & "'C:\Temp'")
            fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\Temp")
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read)
            Console.WriteLine("Read access list after SetPathList = ")
            For Each path In paths
                Console.WriteLine((ControlChars.Tab & path))
            Next path

            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write)
            Console.WriteLine("Write access list after SetPathList = ")
            For Each path In paths
                Console.WriteLine((ControlChars.Tab & path))
            Next path

            Dim pathList() As String
            pathList = fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)

        Catch e As ArgumentException
            ' FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
            Console.WriteLine(("An ArgumentException occurred as a result of using AllAccess. " & "This property cannot be used as a parameter in GetPathList " & "because it represents more than one type of file variable access. : " & ControlChars.Lf & e.ToString()))
        End Try

        Return True
    End Function 'SetGetPathListDemo

    ' The AllFiles property gets or sets the permitted access to all files.
    ' The AllLocalFiles property gets or sets the permitted access to all local files.
    Private Function AllFilesDemo() As Boolean
        Try
            Console.WriteLine("********************************************************" & ControlChars.Lf)

            Dim fileIOPerm1 As FileIOPermission
            Console.WriteLine("Creating a FileIOPermission and adding read access for all files")
            fileIOPerm1 = New FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\Examples\Test\TestFile.txt")
            fileIOPerm1.AllFiles = FileIOPermissionAccess.Read
            Console.WriteLine("AllFiles access = " & fileIOPerm1.AllFiles.ToString())
            Console.WriteLine("Adding AllAccess rights for local files.")
            fileIOPerm1.AllLocalFiles = FileIOPermissionAccess.AllAccess
            Console.WriteLine("AllLocalFiles access = " & fileIOPerm1.AllLocalFiles.ToString())

        Catch e As ArgumentException
            Console.WriteLine(e.ToString())
            Return False
        End Try

        Return True
    End Function 'AllFilesDemo

    ' Invoke all demos.
    Public Function RunDemo() As Boolean

        Dim ret As Boolean = True
        Dim retTmp As Boolean
        ' Call the IsSubsetOfPath demo.
        retTmp = IsSubsetOfDemo()
        If retTmp Then
            Console.Out.WriteLine("IsSubsetOf demo completed successfully.")
        Else
            Console.Out.WriteLine("IsSubsetOf demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the Union demo.
        retTmp = UnionDemo()
        If retTmp Then
            Console.Out.WriteLine("Union demo completed successfully.")
        Else
            Console.Out.WriteLine("Union demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the Intersect demo.  
        retTmp = IntersectDemo()
        If retTmp Then
            Console.Out.WriteLine("Intersect demo completed successfully.")
        Else
            Console.Out.WriteLine("Intersect demo failed.")
        End If
        ret = retTmp AndAlso ret


        ' Call the Copy demo.
        retTmp = CopyDemo()
        If retTmp Then
            Console.Out.WriteLine("Copy demo completed successfully.")
        Else
            Console.Out.WriteLine("Copy demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the ToFromXml demo.  
        retTmp = ToFromXmlDemo()
        If retTmp Then
            Console.Out.WriteLine("ToFromXml demo completed successfully.")
        Else
            Console.Out.WriteLine("ToFromXml demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the SetGetPathList demo. 
        retTmp = SetGetPathListDemo()
        If retTmp Then
            Console.Out.WriteLine("SetGetPathList demo completed successfully.")
        Else
            Console.Out.WriteLine("SetGetPathList demo failed.")
        End If
        ret = retTmp AndAlso ret

        ' Call the AllFiles demo.   
        retTmp = AllFilesDemo()
        If retTmp Then
            Console.Out.WriteLine("AllFiles demo completed successfully.")
        Else
            Console.Out.WriteLine("AllFiles demo failed.")
        End If
        ret = retTmp AndAlso ret

        Return ret
    End Function 'RunDemo

    ' Test harness.
    Public Overloads Shared Sub Main(ByVal args() As [String])
        Try
            Dim democase As New FileIOPermissionDemo()
            Dim ret As Boolean = democase.RunDemo()
            If ret Then
                Console.Out.WriteLine("FileIOPermission demo completed successfully.")
                Console.Out.WriteLine("Press the Enter key to exit.")
                Dim consoleInput As String = Console.ReadLine()
                System.Environment.ExitCode = 100
            Else
                Console.Out.WriteLine("FileIOPermission demo failed.")
                Console.Out.WriteLine("Press the Enter key to exit.")
                Dim consoleInput As String = Console.ReadLine()
                System.Environment.ExitCode = 101
            End If
        Catch e As Exception
            Console.Out.WriteLine("FileIOPermission demo failed")
            Console.WriteLine(e.ToString())
            Console.Out.WriteLine("Press the Enter key to exit.")
            Dim consoleInput As String = Console.ReadLine()
            System.Environment.ExitCode = 101
        End Try
    End Sub 'Main
End Class 'FileIOPermissionDemo


' This class generates FileIOPermission objects.

Friend Class FileIOGenerator


    Private myFile As String() = {"C:\Examples\Test\TestFile.txt", "C:\Examples\Test\", "C:\Examples\Test\..", "C:\Temp"}

    Private myAccess As FileIOPermissionAccess() = {FileIOPermissionAccess.AllAccess, FileIOPermissionAccess.Append, FileIOPermissionAccess.NoAccess, FileIOPermissionAccess.PathDiscovery, FileIOPermissionAccess.Read, FileIOPermissionAccess.Write}

    Private fileIndex As Integer = 0


    Public Sub New()

        ResetIndex()
    End Sub 'New


    Public Sub ResetIndex()
        fileIndex = 0
    End Sub 'ResetIndex

    ' Create a file path.
    Public Function CreateFilePath(ByRef file As String) As Boolean

        If fileIndex = myFile.Length Then

            file = ""
            fileIndex &= 1
            Return True
        End If
        If fileIndex > myFile.Length Then
            file = ""
            Return False
        End If

        file = myFile(fileIndex)
        fileIndex = fileIndex + 1

        Try
            Return True
        Catch e As Exception
            Console.WriteLine(("Cannot create FileIOPermission: " & file & " " & e.ToString()))
            file = ""
            Return True
        End Try
    End Function
End Class

using System;
using System.Security;
using System.Security.Permissions;
using System.Collections;

[assembly: CLSCompliant(true)]

public class FileIOPermissionDemo
{
    // IsSubsetOf determines whether the current permission is a subset of the specified permission.
    // This method compares various FileIOPermission paths with FileIOPermissionAccess set to AllAccess.
    private bool IsSubsetOfDemo()
    {

        bool returnValue = true;

        string fileIO1, fileIO2;
        FileIOPermission fileIOPerm1, fileIOPerm2;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath(out fileIO1 ))
        {
            if(fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess, fileIO1);

            Console.WriteLine("**********************************************************\n");

            fileIOGen2.ResetIndex();

            while (fileIOGen2.CreateFilePath(out fileIO2))
            {
                if (fileIO2 == "")
                    fileIOPerm2 = new FileIOPermission(PermissionState.None);
                else
                    fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.AllAccess, fileIO2);
                string firstPermission = fileIO1 == "" | fileIO1 == null ? "null" : fileIO1;
                string secondPermission = fileIO2 == "" | fileIO2 == null ? "null" : fileIO2;
                if (fileIOPerm2 == null) continue;
                try
                {
                    if (fileIOPerm1.IsSubsetOf(fileIOPerm2))
                    {

                        Console.WriteLine(firstPermission + " is a subset of " + secondPermission + "\n");
                    }
                    else
                    {
                        Console.WriteLine(firstPermission + " is not a subset of " + secondPermission + "\n");
                    }

                }
                catch (Exception e)
                {
                    Console.WriteLine("An exception was thrown for subset :" + fileIO1 == "" ? "null" : fileIO1 + "\n" +
                        fileIO2 == "" ? "null" : fileIO2 + "\n" + e);
                }
            }
        }
        return returnValue;
    }

    // Union creates a new permission that is the union of the current permission and the specified permission.
    private bool UnionDemo()
    {

        bool returnValue = true;

        string fileIO1, fileIO2;
        FileIOPermission fileIOPerm1, fileIOPerm2;
        IPermission fileIOPerm3;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath( out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO1);
            if (fileIO1 == null) continue;

            Console.WriteLine("**********************************************************\n");
            fileIOGen2.ResetIndex();

            while (fileIOGen2.CreateFilePath( out fileIO2 ))
            {
                if (fileIO2 == "")
                    fileIOPerm2 = new FileIOPermission(PermissionState.None);
                else
                    fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO2);
                try
                {
                    string firstPermission = fileIO1 == "" | fileIO1 == null ? "null" : fileIO1;
                    string secondPermission = fileIO2 == "" | fileIO2 == null ? "null" : fileIO2;
                    fileIOPerm3 = (FileIOPermission)fileIOPerm1.Union(fileIOPerm2);
                    fileIOPerm3 = fileIOPerm1.Union(fileIOPerm2);

                    if (fileIOPerm3 == null)
                    {
                        Console.WriteLine("The union of " + firstPermission + " and " + secondPermission + " is null.");
                    }
                    else
                    {
                        Console.WriteLine("The union of " + firstPermission + " and " + secondPermission +
                            " = \n\t" + ((FileIOPermission)fileIOPerm3).GetPathList(FileIOPermissionAccess.Read)[0]);
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine("An exception was thrown for union " + e);
                    returnValue = false;
                }

            }

        }

        return returnValue;

    }

    // Intersect creates and returns a new permission that is the intersection of the current
    // permission and the permission specified.
    private bool IntersectDemo()
    {

        bool returnValue = true;

        string fileIO1, fileIO2;
        FileIOPermission fileIOPerm1, fileIOPerm2, fileIOPerm3;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath(out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO1);

            Console.WriteLine("**********************************************************\n");
            fileIOGen2.ResetIndex();

            while (fileIOGen2.CreateFilePath( out fileIO2 ))
            {
                if (fileIO2 == "")
                    fileIOPerm2 = new FileIOPermission(PermissionState.None);
                else
                    fileIOPerm2 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO2);
                string firstPermission = fileIO1 == "" | fileIO1 == null ? "null" : fileIO1;
                string secondPermission = fileIO2 == "" | fileIO2 == null ? "null" : fileIO2;
                try
                {

                    fileIOPerm3 = (FileIOPermission)fileIOPerm1.Intersect(fileIOPerm2);
                    if (fileIOPerm3 != null && fileIOPerm3.GetPathList(FileIOPermissionAccess.Read) != null)
                    {

                        Console.WriteLine("The intersection of " + firstPermission + " and \n\t" + secondPermission +
                            " = \n\t" + ((FileIOPermission)fileIOPerm3).GetPathList(FileIOPermissionAccess.Read)[0]);
                    }
                    else
                    {
                        Console.WriteLine("The intersection of " + firstPermission + " and " + secondPermission + " is null.");
                    }
                }
                catch (Exception e)
                {
                    Console.WriteLine("An exception was thrown for intersection " + e);
                    returnValue = false;
                }
            }
        }

        return returnValue;

    }

    //Copy creates and returns an identical copy of the current permission.
    private bool CopyDemo()
    {
        bool returnValue = true;
        string fileIO1;
        FileIOPermission fileIOPerm1, fileIOPerm2;
        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath( out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO1);

            Console.WriteLine("**********************************************************\n");
            fileIOGen2.ResetIndex();
            try
            {
                fileIOPerm2 = (FileIOPermission)fileIOPerm1.Copy();
                if (fileIOPerm2 != null)
                {
                    Console.WriteLine("Result of copy = " + fileIOPerm2.ToString() + "\n");
                }
                else
                {
                    Console.WriteLine("Result of copy is null. \n");
                }
            }
            catch (Exception e)
            {
                {
                    if (fileIO1 == "")
                    {
                        Console.WriteLine("The target FileIOPermission is empty, copy failed.");

                    }
                    else
                        Console.WriteLine(e);
                }
                continue;
            }
        }
        return returnValue;
    }

    // ToXml creates an XML encoding of the permission and its current state;
    // FromXml reconstructs a permission with the specified state from the XML encoding.
    private bool ToFromXmlDemo()
    {

        bool returnValue = true;

        string fileIO1;
        FileIOPermission fileIOPerm1, fileIOPerm2;

        FileIOGenerator fileIOGen1 = new FileIOGenerator();
        FileIOGenerator fileIOGen2 = new FileIOGenerator();

        fileIOGen1.ResetIndex();
        while (fileIOGen1.CreateFilePath( out fileIO1 ))
        {
            if (fileIO1 == "")
                fileIOPerm1 = new FileIOPermission(PermissionState.None);
            else
                fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.Read, fileIO1);

            Console.WriteLine("********************************************************\n");
            fileIOGen2.ResetIndex();
            try
            {
                fileIOPerm2 = new FileIOPermission(PermissionState.None);
                fileIOPerm2.FromXml(fileIOPerm1.ToXml());
                Console.WriteLine("Result of ToFromXml = " + fileIOPerm2.ToString() + "\n");

            }
            catch (Exception e)
            {
                Console.WriteLine("ToFromXml failed :" + fileIOPerm1.ToString() + e);
                continue;
            }
        }

        return returnValue;

    }

    // AddPathList adds access for the specified files and directories to the existing state of the permission.
    // SetPathList sets the specified access to the specified files and directories, replacing the existing state
    // of the permission.
    // GetPathList gets all files and directories that have the specified FileIOPermissionAccess.
    private bool SetGetPathListDemo()
    {
        try
        {
            Console.WriteLine("********************************************************\n");

            FileIOPermission fileIOPerm1;
            Console.WriteLine("Creating a FileIOPermission with AllAccess rights for 'C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\\Examples\\Test\\TestFile.txt");
            Console.WriteLine("Adding 'C:\\Temp' to the write access list, and \n 'C:\\Examples\\Test' to read access.");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, "C:\\Examples\\Test");
            string[] paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
            Console.WriteLine("Read access before SetPathList = ");
            foreach (string path in paths)
            {
                Console.WriteLine("\t" + path);
            }
            Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
            fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
            Console.WriteLine("Read access list after SetPathList = ");
            foreach (string path in paths)
            {
                Console.WriteLine("\t" + path);
            }

            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
            Console.WriteLine("Write access list after SetPathList = ");
            foreach (string path in paths)
            {
                Console.WriteLine("\t" + path);
            }

            Console.WriteLine("Write access = \n" +
                fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess));

        }
        catch (ArgumentException e)
        {
            // FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
            Console.WriteLine("An ArgumentException occurred as a result of using AllAccess. "
                + "This property cannot be used as a parameter in GetPathList "
                + "because it represents more than one type of file variable access. : \n" + e);
        }

        return true;
    }

    // The AllFiles property gets or sets the permitted access to all files.
    // The AllLocalFiles property gets or sets the permitted access to all local files.
    private bool AllFilesDemo()
    {
        try
        {
            Console.WriteLine("********************************************************\n");

            FileIOPermission fileIOPerm1;
            Console.WriteLine("Creating a FileIOPermission and adding read access for all files");
            fileIOPerm1 = new FileIOPermission(FileIOPermissionAccess.AllAccess, "C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1.AllFiles = FileIOPermissionAccess.Read;
            Console.WriteLine("AllFiles access = " + fileIOPerm1.AllFiles);
            Console.WriteLine("Adding AllAccess rights for local files.");
            fileIOPerm1.AllLocalFiles = FileIOPermissionAccess.AllAccess;
            Console.WriteLine("AllLocalFiles access = " + fileIOPerm1.AllLocalFiles);

        }
        catch (ArgumentException e)
        {
            Console.WriteLine(e);
            return false;
        }

        return true;
    }

    // Invoke all demos.
    public bool RunDemo()
    {

        bool ret = true;
        bool retTmp;
        // Call the IsSubsetOfPath demo.
        if (retTmp = IsSubsetOfDemo()) Console.Out.WriteLine("IsSubsetOf demo completed successfully.");
        else Console.Out.WriteLine("IsSubsetOf demo failed.");
        ret = retTmp && ret;

        // Call the Union demo.
        if (retTmp = UnionDemo()) Console.Out.WriteLine("Union demo completed successfully.");
        else Console.Out.WriteLine("Union demo failed.");
        ret = retTmp && ret;

        // Call the Intersect demo.
        if (retTmp = IntersectDemo()) Console.Out.WriteLine("Intersect demo completed successfully.");
        else Console.Out.WriteLine("Intersect demo failed.");
        ret = retTmp && ret;


        // Call the Copy demo.
        if (retTmp = CopyDemo()) Console.Out.WriteLine("Copy demo completed successfully.");
        else Console.Out.WriteLine("Copy demo failed.");
        ret = retTmp && ret;

        // Call the ToFromXml demo.
        if (retTmp = ToFromXmlDemo()) Console.Out.WriteLine("ToFromXml demo completed successfully.");
        else Console.Out.WriteLine("ToFromXml demo failed.");
        ret = retTmp && ret;

        // Call the SetGetPathList demo.
        if (retTmp = SetGetPathListDemo()) Console.Out.WriteLine("SetGetPathList demo completed successfully.");
        else Console.Out.WriteLine("SetGetPathList demo failed.");
        ret = retTmp && ret;

        // Call the AllFiles demo.
        if (retTmp = AllFilesDemo()) Console.Out.WriteLine("AllFiles demo completed successfully.");
        else Console.Out.WriteLine("AllFiles demo failed.");
        ret = retTmp && ret;

        return (ret);

    }
    // Test harness.
    public static void Main(String[] args)
    {
        try
        {
            FileIOPermissionDemo democase = new FileIOPermissionDemo();
            bool ret = democase.RunDemo();
            if (ret)
            {
                Console.Out.WriteLine("FileIOPermission demo completed successfully.");
                Console.Out.WriteLine("Press the Enter key to exit.");
                string consoleInput = Console.ReadLine();
                System.Environment.ExitCode = 100;
            }
            else
            {
                Console.Out.WriteLine("FileIOPermission demo failed.");
                Console.Out.WriteLine("Press the Enter key to exit.");
                string consoleInput = Console.ReadLine();
                System.Environment.ExitCode = 101;
            }
        }
        catch (Exception e)
        {
            Console.Out.WriteLine("FileIOPermission demo failed");
            Console.WriteLine(e.ToString());
            Console.Out.WriteLine("Press the Enter key to exit.");
            string consoleInput = Console.ReadLine();
            System.Environment.ExitCode = 101;
        }
    }
}


// This class generates FileIOPermission objects.

internal class FileIOGenerator
{


    private string[] myFile =
{
    "C:\\Examples\\Test\\TestFile.txt",
    "C:\\Examples\\Test\\",
    "C:\\Examples\\Test\\..",
    "C:\\Temp"
};

    private FileIOPermissionAccess[] myAccess =
{
    FileIOPermissionAccess.AllAccess,
    FileIOPermissionAccess.Append,
    FileIOPermissionAccess.NoAccess,
    FileIOPermissionAccess.PathDiscovery,
    FileIOPermissionAccess.Read,
    FileIOPermissionAccess.Write
};

    private int fileIndex = 0;

    public FileIOGenerator()
    {

        ResetIndex();
    }

    public void ResetIndex()
    {
        fileIndex = 0;
    }

    // Create a  file path string.
    public bool CreateFilePath( out string file )
    {

        if (fileIndex == myFile.Length)
        {

            file = "";
            fileIndex++;
            return true;

        }
        if (fileIndex > myFile.Length)
        {
            file = "";
            return false;
        }

        file = myFile[fileIndex++];

        try
        {
            return true;
        }
        catch (Exception e)
        {
            Console.WriteLine("Cannot create FileIOPermission: " + file + " " + e);
            file = "";
            return true;
        }
    }
}

using namespace System::Runtime::InteropServices;
using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Collections;

// This class generates FileIOPermission objects.

[assembly:CLSCompliant(true)];
private ref class FileIOGenerator
{
private:
   array<String^>^myFile;
   array<FileIOPermissionAccess>^myAccess;
   int fileIndex;

public:
   FileIOGenerator()
   {
      array<String^>^tempFile = {"C:\\Examples\\Test\\TestFile.txt","C:\\Examples\\Test\\","C:\\Examples\\Test\\..","C:\\Temp"};
      myFile = tempFile;
      array<FileIOPermissionAccess>^ tempAccess = {FileIOPermissionAccess::AllAccess,FileIOPermissionAccess::Append,FileIOPermissionAccess::NoAccess,FileIOPermissionAccess::PathDiscovery,FileIOPermissionAccess::Read,FileIOPermissionAccess::Write};
      myAccess = tempAccess;
      ResetIndex();
   }

   void ResetIndex()
   {
      fileIndex = 0;
   }


   // Create a file path.
   bool CreateFilePath(  [Out]interior_ptr<String^> file )
   {
      if ( fileIndex == myFile->Length )
      {
         
  
          *file = "";
         fileIndex++;
         return true;
      }

      if ( fileIndex > myFile->Length )
      {
          *file = "";
         return false;
      }

       *file = myFile[ fileIndex++ ];
      try
      {
         return true;
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "Cannot create FileIOPermission: {0} {1}",  *file, e );
          *file = "";
         return true;
      }

   }

};

public ref class FileIOPermissionDemo
{
private:

   // IsSubsetOf determines whether the current permission is a subset of the specified permission.
   // This method compares various FileIOPermission paths with FileIOPermissionAccess set to AllAccess.
   bool IsSubsetOfDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      String^ fileIO2;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath(  &fileIO1 ) )
      {
          if (fileIO1 == "")
              fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::AllAccess, fileIO1);

         Console::WriteLine( "**********************************************************\n" );
         fileIOGen2->ResetIndex();
         while ( fileIOGen2->CreateFilePath( &fileIO2 ) )
         {
            if (fileIO2 == "")
                fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
            else
              fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::AllAccess, fileIO2);
            String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr ? "null" : fileIO1;
            String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr ? "null" : fileIO2;
            if ( fileIOPerm2 == nullptr )
                        continue;
            try
            {
               if ( fileIOPerm1->IsSubsetOf( fileIOPerm2 ) )
               {
                  Console::WriteLine( "{0} is a subset of {1}\n", firstPermission, secondPermission );
               }
               else
               {
                  Console::WriteLine( "{0} is not a subset of {1}\n", firstPermission, secondPermission );
               }
            }
            catch ( Exception^ e ) 
            {
               Console::WriteLine( "An exception was thrown for subset :{0}\n{1}\n{2}", (fileIO1->Equals( "" ) ? "null" : fileIO1), (fileIO2->Equals( "" ) ? "null" : fileIO2), e );
            }

         }
      }

      return returnValue;
   }


   // Union creates a new permission that is the union of the current permission and the specified permission.
   bool UnionDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      String^ fileIO2;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      IPermission^ fileIOPerm3;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath(  &fileIO1 ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO1);

         Console::WriteLine( "**********************************************************\n" );
         fileIOGen2->ResetIndex();
         while ( fileIOGen2->CreateFilePath(  &fileIO2 ) )
         {
             if (fileIO2 == "")
                 fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
            else
              fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO2);
            try
            {
               if ( fileIOPerm2 == nullptr )
                              continue;
               String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr ? "null" : fileIO1;
               String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr ? "null" : fileIO2;
               fileIOPerm3 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Union( fileIOPerm2 ));
               fileIOPerm3 = fileIOPerm1->Union( fileIOPerm2 );
               if ( fileIOPerm3 == nullptr )
               {
                  Console::WriteLine( "The union of {0}  and {1} is null.", firstPermission, secondPermission );
               }
               else
               {
                  Console::WriteLine( "The union of {0}  and {1} = \n\t{2}", firstPermission, secondPermission, (dynamic_cast<FileIOPermission^>(fileIOPerm3))->GetPathList( FileIOPermissionAccess::Read )[ 0 ] );
               }
            }
            catch ( Exception^ e ) 
            {
               Console::WriteLine( "An exception was thrown for union {0}", e );
               returnValue = false;
            }

         }
      }

      return returnValue;
   }


   // Intersect creates and returns a new permission that is the intersection of the current 
   // permission and the permission specified.
   bool IntersectDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      String^ fileIO2;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOPermission^ fileIOPerm3;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath ( &fileIO1  ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO1);

         Console::WriteLine( "**********************************************************\n" );
         fileIOGen2->ResetIndex();
         while ( fileIOGen2->CreateFilePath( &fileIO2  ) )
         {
            if (fileIO2 == "")
                fileIOPerm2 = gcnew FileIOPermission(PermissionState::None);
            else
              fileIOPerm2 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO2);
            String^ firstPermission = fileIO1 == "" || fileIO1 == nullptr ? "null" : fileIO1;
            String^ secondPermission = fileIO2 == "" || fileIO2 == nullptr ? "null" : fileIO2;
            try
            {
               fileIOPerm3 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Intersect( fileIOPerm2 ));
               if ( fileIOPerm3 != nullptr && fileIOPerm3->GetPathList( FileIOPermissionAccess::Read ) != nullptr )
               {
                  Console::WriteLine( "The intersection of {0}  and \n\t{1} = \n\t{2}", firstPermission, secondPermission, (dynamic_cast<FileIOPermission^>(fileIOPerm3))->GetPathList( FileIOPermissionAccess::Read )[ 0 ] );
               }
               else
               {
                  Console::WriteLine( "The intersection of {0}  and {1} is null.", firstPermission, secondPermission );
               }
            }
            catch ( Exception^ e ) 
            {
               Console::WriteLine( "An exception was thrown for intersection {0}", e );
               returnValue = false;
            }

         }
      }

      return returnValue;
   }


   //Copy creates and returns an identical copy of the current permission.
   bool CopyDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath( &fileIO1 ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO1);

         Console::WriteLine( "**********************************************************\n" );
         fileIOGen2->ResetIndex();
         try
         {
            fileIOPerm2 = dynamic_cast<FileIOPermission^>(fileIOPerm1->Copy());
            if ( fileIOPerm2 != nullptr )
            {
               Console::WriteLine( "Result of copy = {0}\n", fileIOPerm2 );
            }
            else
            {
               Console::WriteLine( "Result of copy is null. \n" );
            }
         }
         catch ( Exception^ e ) 
         {
            {
               if ( fileIO1->Equals( "" ) )
               {
                  Console::WriteLine( "The target FileIOPermission is empty, copy failed." );
               }
               else
                              Console::WriteLine( e );
            }
            continue;
         }

      }

      return returnValue;
   }


   // ToXml creates an XML encoding of the permission and its current state; 
   // FromXml reconstructs a permission with the specified state from the XML encoding. 
   bool ToFromXmlDemo()
   {
      bool returnValue = true;
      String^ fileIO1;
      FileIOPermission^ fileIOPerm1;
      FileIOPermission^ fileIOPerm2;
      FileIOGenerator^ fileIOGen1 = gcnew FileIOGenerator;
      FileIOGenerator^ fileIOGen2 = gcnew FileIOGenerator;
      fileIOGen1->ResetIndex();
      while ( fileIOGen1->CreateFilePath( &fileIO1 ) )
      {
         if (fileIO1 == "")
             fileIOPerm1 = gcnew FileIOPermission(PermissionState::None);
          else
              fileIOPerm1 = gcnew FileIOPermission(FileIOPermissionAccess::Read, fileIO1);

         Console::WriteLine( "********************************************************\n" );
         fileIOGen2->ResetIndex();
         try
         {
            fileIOPerm2 = gcnew FileIOPermission( PermissionState::None );
            fileIOPerm2->FromXml( fileIOPerm1->ToXml() );
            Console::WriteLine( "Result of ToFromXml = {0}\n", fileIOPerm2 );
         }
         catch ( Exception^ e ) 
         {
            Console::WriteLine( "ToFromXml failed :{0}{1}", fileIOPerm1, e );
            continue;
         }

      }

      return returnValue;
   }


   // AddPathList adds access for the specified files and directories to the existing state of the permission.
   // SetPathList sets the specified access to the specified files and directories, replacing the existing state 
   // of the permission.
   // GetPathList gets all files and directories that have the specified FileIOPermissionAccess.
   bool SetGetPathListDemo()
   {
      try
      {
         Console::WriteLine( "********************************************************\n" );
         FileIOPermission^ fileIOPerm1;
         Console::WriteLine( "Creating a FileIOPermission with AllAccess rights for 'C:\\Examples\\Test\\TestFile.txt" );
         
         fileIOPerm1 = gcnew FileIOPermission( FileIOPermissionAccess::AllAccess,"C:\\Examples\\Test\\TestFile.txt" );
         
         Console::WriteLine( "Adding 'C:\\Temp' to the write access list, and \n 'C:\\Examples\\Test' to read access." );
         fileIOPerm1->AddPathList( FileIOPermissionAccess::Write, "C:\\Temp" );
         fileIOPerm1->AddPathList( FileIOPermissionAccess::Read, "C:\\Examples\\Test" );
         array<String^>^paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
         Console::WriteLine( "Read access before SetPathList = " );
         IEnumerator^ myEnum = paths->GetEnumerator();
         while ( myEnum->MoveNext() )
         {
            String^ path = safe_cast<String^>(myEnum->Current);
            Console::WriteLine( "\t{0}", path );
         }

         Console::WriteLine( "Setting the read access list to \n'C:\\Temp'" );
         fileIOPerm1->SetPathList( FileIOPermissionAccess::Read, "C:\\Temp" );
         paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Read );
         Console::WriteLine( "Read access list after SetPathList = " );
         IEnumerator^ myEnum1 = paths->GetEnumerator();
         while ( myEnum1->MoveNext() )
         {
            String^ path = safe_cast<String^>(myEnum1->Current);
            Console::WriteLine( "\t{0}", path );
         }

         paths = fileIOPerm1->GetPathList( FileIOPermissionAccess::Write );
         Console::WriteLine( "Write access list after SetPathList = " );
         IEnumerator^ myEnum2 = paths->GetEnumerator();
         while ( myEnum2->MoveNext() )
         {
            String^ path = safe_cast<String^>(myEnum2->Current);
            Console::WriteLine( "\t{0}", path );
         }

         Console::WriteLine( "Write access = \n{0}", fileIOPerm1->GetPathList( FileIOPermissionAccess::AllAccess ) );
      }
      catch ( ArgumentException^ e ) 
      {
         
         // FileIOPermissionAccess.AllAccess can not be used as a parameter for GetPathList.
         Console::WriteLine( "An ArgumentException occurred as a result of using AllAccess. This property cannot be used as a parameter in GetPathList because it represents more than one type of file variable access. : \n{0}", e );
      }

      return true;
   }


   // The AllFiles property gets or sets the permitted access to all files.
   // The AllLocalFiles property gets or sets the permitted access to all local files.
   bool AllFilesDemo()
   {
      try
      {
         Console::WriteLine( "********************************************************\n" );
         FileIOPermission^ fileIOPerm1;
         Console::WriteLine( "Creating a FileIOPermission and adding read access for all files" );
         fileIOPerm1 = gcnew FileIOPermission( FileIOPermissionAccess::AllAccess,"C:\\Examples\\Test\\TestFile.txt" );
         fileIOPerm1->AllFiles = FileIOPermissionAccess::Read;
         Console::WriteLine( "AllFiles access = {0}", fileIOPerm1->AllFiles );
         Console::WriteLine( "Adding AllAccess rights for local files." );
         fileIOPerm1->AllLocalFiles = FileIOPermissionAccess::AllAccess;
         Console::WriteLine( "AllLocalFiles access = {0}", fileIOPerm1->AllLocalFiles );
      }
      catch ( ArgumentException^ e ) 
      {
         Console::WriteLine( e );
         return false;
      }

      return true;
   }


public:

   // Invoke all demos.
   bool RunDemo()
   {
      bool ret = true;
      bool retTmp;
      
      // Call the IsSubsetOfPath demo.
      if ( retTmp = IsSubsetOfDemo() )
            Console::WriteLine( "IsSubsetOf demo completed successfully." );
      else
            Console::WriteLine( "IsSubsetOf demo failed." );

      ret = retTmp && ret;
      
      // Call the Union demo.
      if ( retTmp = UnionDemo() )
            Console::WriteLine( "Union demo completed successfully." );
      else
            Console::WriteLine( "Union demo failed." );

      ret = retTmp && ret;
      
      // Call the Intersect demo. 
      if ( retTmp = IntersectDemo() )
            Console::WriteLine( "Intersect demo completed successfully." );
      else
            Console::WriteLine( "Intersect demo failed." );

      ret = retTmp && ret;
      
      // Call the Copy demo. 
      if ( retTmp = CopyDemo() )
            Console::WriteLine( "Copy demo completed successfully." );
      else
            Console::WriteLine( "Copy demo failed." );

      ret = retTmp && ret;
      
      // Call the ToFromXml demo. 
      if ( retTmp = ToFromXmlDemo() )
            Console::WriteLine( "ToFromXml demo completed successfully." );
      else
            Console::WriteLine( "ToFromXml demo failed." );

      ret = retTmp && ret;
      
      // Call the SetGetPathList demo. 
      if ( retTmp = SetGetPathListDemo() )
            Console::WriteLine( "SetGetPathList demo completed successfully." );
      else
            Console::WriteLine( "SetGetPathList demo failed." );

      ret = retTmp && ret;
      
      // Call the AllFiles demo. 
      if ( retTmp = AllFilesDemo() )
            Console::WriteLine( "AllFiles demo completed successfully." );
      else
            Console::WriteLine( "AllFiles demo failed." );

      ret = retTmp && ret;
      return (ret);
   }

};


// Test harness.
int main()
{
   try
   {
      FileIOPermissionDemo^ democase = gcnew FileIOPermissionDemo;
      bool ret = democase->RunDemo();
      if ( ret )
      {
         Console::WriteLine( "FileIOPermission demo completed successfully." );
         Console::WriteLine( "Press the Enter key to exit." );
         Console::ReadLine();
         System::Environment::ExitCode = 100;
      }
      else
      {
         Console::WriteLine( "FileIOPermission demo failed." );
         Console::WriteLine( "Press the Enter key to exit." );
         Console::ReadLine();
         System::Environment::ExitCode = 101;
      }
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "FileIOPermission demo failed" );
      Console::WriteLine( e );
      Console::WriteLine( "Press the Enter key to exit." );
      Console::ReadLine();
      System::Environment::ExitCode = 101;
   }

}

// This sample demonstrates the IsSubsetOf, Union, Intersect, Copy, 
// ToXml, FromXml, GetPathList and SetPathList methods, and the 
// AllFiles and AllLocalFiles properties
// of the FileIOPermission class.

import System.*;
import System.Security.*;
import System.Security.Permissions.*;
import System.Collections.*;

/** @assembly CLSCompliant(true)
 */

public class FileIOPermissionDemo
{
    // IsSubsetOf determines whether the current permission is a 
    // subset of the specified permission.
    // This method compares various FileIOPermission paths with 
    // FileIOPermissionAccess set to AllAccess.
    private boolean IsSubsetOfDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1] ;
        String fileIO2[] = new String[1] ;
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1] ;
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1] ;
        
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, 
            FileIOPermissionAccess.AllAccess)) {
            if (fileIOPerm1[0] == null) {
                continue ;
            }         
            Console.WriteLine("***********************" 
                + "***********************************\n");
            fileIOGen2.ResetIndex();
            
            while(fileIOGen2.CreateFilePath(fileIOPerm2, fileIO2, 
                FileIOPermissionAccess.AllAccess)) {
                String firstPermission = (fileIO1[0].equals("") == 
                    true | fileIO1[0] == null) ? "null" : fileIO1[0];
                String secondPermission = (fileIO2[0].equals("") == 
                    true | fileIO2[0] == null) ? "null" : fileIO2[0];
                if (fileIOPerm2[0] == null) {
                    continue ;
                }
                try {
                    if (fileIOPerm1[0].IsSubsetOf(fileIOPerm2[0])) {
                        Console.WriteLine((firstPermission 
                            + " is a subset of " 
                            + secondPermission + "\n"));
                    }
                    else {
                        Console.WriteLine((firstPermission 
                            + " is not a subset of " 
                            + secondPermission + "\n"));
                    }
                } 
                catch(System.Exception e) {
                    Console.WriteLine(("An exception was thrown for subset :" 
                        + ((fileIO1[0].equals("") == true) ? 
                        "null" : (fileIO1[0] + "\n" 
                        + ((fileIO2[0].equals("") == true) ? 
                        "null" : fileIO2[0]) + "\n" + e))));
                }
            }
        }
        return returnValue ;
    } //IsSubsetOfDemo   

    // Union creates a new permission that is the union of the current 
    // permission and the specified permission.
    private boolean UnionDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        String fileIO2[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
        
        IPermission fileIOPerm3;
        
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, 
            fileIO1, FileIOPermissionAccess.Read)) {
            if (fileIO1[0] == null) {
                continue ;
            }
            Console.WriteLine("*****************************" 
                + "*****************************\n");
            fileIOGen2.ResetIndex();
            
            while(fileIOGen2.CreateFilePath(fileIOPerm2, 
                fileIO2, FileIOPermissionAccess.Read)) {
                try {
                    if (fileIOPerm2[0] == null) {
                        continue ;
                    }
                    
                    String firstPermission = (fileIO1[0].equals("")==
                        true | fileIO1[0] == null) ? "null" : fileIO1[0];
                    String secondPermission = (fileIO2[0].equals("") == 
                        true | fileIO2[0] == null) ? "null" : fileIO2[0];
                    fileIOPerm3 =((FileIOPermission)(fileIOPerm1[0].
                        Union(fileIOPerm2[0])));
                    fileIOPerm3 = fileIOPerm1[0].Union(fileIOPerm2[0]);
                    
                    if (fileIOPerm3 == null) {
                        Console.WriteLine(("The union of " 
                            + firstPermission + " and " 
                            + secondPermission 
                            + " is null."));
                    }
                    else {
                        Console.WriteLine(("The union of " + firstPermission 
                            + " and " + secondPermission + " = \n\t" 
                            + ((FileIOPermission)(fileIOPerm3)).
                            GetPathList(FileIOPermissionAccess.Read).
                            get_Item( 0)));
                    }
                }
                catch(System.Exception e) {
                    Console.WriteLine(("An exception was " 
                        + "thrown for union " + e));
                    returnValue = false;
                }
            }
        }
        return returnValue ;
    } //UnionDemo    

    // Intersect creates and returns a new permission that is 
    // the intersection of the current
    // permission and the permission specified.
    private boolean IntersectDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        String fileIO2[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm3;
        
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, 
            FileIOPermissionAccess.Read)) {
            if (fileIO1[0] == null) {
                continue ;
            }
            Console.WriteLine("***************************" 
                + "*******************************\n");
            fileIOGen2.ResetIndex();
            
            while(fileIOGen2.CreateFilePath(fileIOPerm2, fileIO2, 
                FileIOPermissionAccess.Read)) {
                if ( fileIOPerm2[0] == null  ) {
                    continue ;
                }
                String firstPermission = (fileIO1[0].equals("") == 
                    true | fileIO1[0] == null) ? "null" : fileIO1[0];
                String secondPermission = (fileIO2[0].equals("") == 
                    true | fileIO2[0] == null) ? "null" : fileIO2[0];
                try {
                    fileIOPerm3 =((FileIOPermission)(fileIOPerm1[0].
                    Intersect(fileIOPerm2[0])));
                    if (fileIOPerm3  != null && 
                        fileIOPerm3.GetPathList(FileIOPermissionAccess.Read)
                        != null) {
                        Console.WriteLine(("The intersection of " 
                            + firstPermission + " and \n\t" 
                            + secondPermission + " = \n\t" 
                            + ((FileIOPermission)(fileIOPerm3)).
                            GetPathList(FileIOPermissionAccess.Read).
                            get_Item( 0)));
                    }
                    else {
                        Console.WriteLine(("The intersection of " 
                            + firstPermission + " and " 
                            + secondPermission + " is null."));
                    }
                }
                catch(System.Exception e) {
                    Console.WriteLine(("An exception was " 
                        + "thrown for intersection " + e));
                        returnValue = false;
                }
            }
        }
        return returnValue ;
    } //IntersectDemo    

    //Copy creates and returns an identical copy of the current permission.
    private boolean CopyDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];
        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, 
            FileIOPermissionAccess.Read)) {
                if (fileIO1 == null) {
                    continue ;
                }
                Console.WriteLine("**********************************" 
                + "************************\n");
                fileIOGen2.ResetIndex();
                try {
                    fileIOPerm2[0] =((FileIOPermission)(fileIOPerm1[0].Copy()));
                    if (fileIOPerm2[0]  != null) {
                        Console.WriteLine(("Result of copy = " 
                        + fileIOPerm2[0].ToString() + "\n"));
                    }
                    else {
                        Console.WriteLine("Result of copy is null. \n");
                    }
                }
                catch(System.Exception e) {
                    if (fileIO1[0].Equals("")) {
                        Console.WriteLine("The target FileIOPermission " 
                            + "is empty, copy failed.");
                    }
                    else {
                        Console.WriteLine(e);
                    }
                }
                continue ;
            }
        return returnValue ;
    } //CopyDemo   

    // ToXml creates an XML encoding of the permission and its current state;
    // FromXml reconstructs a permission with the specified state from the XML
    // encoding.
    private boolean ToFromXmlDemo() 
    {
        boolean returnValue = true;
        String fileIO1[] = new String[1];
        FileIOPermission fileIOPerm1[] = new FileIOPermission[1];
        FileIOPermission fileIOPerm2[] = new FileIOPermission[1];

        FileIOGenerator fileIOGen1 =  new FileIOGenerator();
        FileIOGenerator fileIOGen2 =  new FileIOGenerator();
        
        fileIOGen1.ResetIndex();
        while(fileIOGen1.CreateFilePath(fileIOPerm1, fileIO1, 
            FileIOPermissionAccess.Read)) {
            if (fileIOPerm1[0] == null) {
                continue ;
            }
            Console.WriteLine("**********************************" 
                + "**********************\n");
            fileIOGen2.ResetIndex();
            try {
                fileIOPerm2[0] = new FileIOPermission(PermissionState.None);
                fileIOPerm2[0].FromXml(fileIOPerm1[0].ToXml());
                Console.WriteLine(("Result of ToFromXml = " 
                    + fileIOPerm2[0].ToString() + "\n"));
            } 
            catch(System.Exception  e) {
                Console.WriteLine(("ToFromXml failed :" 
                    + fileIOPerm1[0].ToString() + e));
                continue ;
            }
        }
        return returnValue ;
    } //ToFromXmlDemo    

    // AllAccess
    // AddPathList adds access for the specified files and directories to the 
    // existing state of the permission.
    // SetPathList sets the specified access to the specified files and 
    // directories, replacing the existing state of the permission.
    // GetPathList gets all files and directories that have the specified 
    // FileIOPermissionAccess.
    private boolean SetGetPathListDemo() 
    {
        try {
            Console.WriteLine("****************************" 
                + "****************************\n");
            FileIOPermission fileIOPerm1;
            
            Console.WriteLine("Creating a FileIOPermission with AllAccess " 
                + "rights for 'C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1 = new FileIOPermission(
                FileIOPermissionAccess.AllAccess, 
                "C:\\Examples\\Test\\TestFile.txt");

            Console.WriteLine("Adding 'C:\\Temp' to the write access " 
                + "list, and \n " +    "'C:\\Examples\\Test' to read access.");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Write, "C:\\Temp");
            fileIOPerm1.AddPathList(FileIOPermissionAccess.Read, 
                "C:\\Examples\\Test");
            String paths[] = fileIOPerm1.GetPathList(
                FileIOPermissionAccess.Read);
            Console.WriteLine("Read access before SetPathList = ");
            for (int iCtr = 0; iCtr < paths.length; iCtr++) {
                String path = paths[iCtr];
                Console.WriteLine(("\t" + path));
            }

            Console.WriteLine("Setting the read access list to \n'C:\\Temp'");
            fileIOPerm1.SetPathList(FileIOPermissionAccess.Read, "C:\\Temp");
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Read);
            Console.WriteLine("Read access list after SetPathList = ");
            for (int iCtr = 0; iCtr < paths.length; iCtr++) {
                String path = paths[iCtr];
                Console.WriteLine(("\t" + path));
            }            
            
            paths = fileIOPerm1.GetPathList(FileIOPermissionAccess.Write);
            Console.WriteLine("Write access list after SetPathList = ");
            for (int iCtr = 0; iCtr < paths.length; iCtr++) {
                String path = paths[iCtr];
                Console.WriteLine(("\t" + path));
            }            
            Console.WriteLine(("Write access = \n" 
                + fileIOPerm1.GetPathList(FileIOPermissionAccess.AllAccess)));
        }
        catch(ArgumentException e){
            // FileIOPermissionAccess.AllAccess can not be used as a 
            // parameter for GetPathList.
            Console.WriteLine(("An ArgumentException occurred as a result " 
                + "of using AllAccess. " + "This property cannot be used as a " 
                + "parameter in GetPathList " 
                + "because it represents more than one type of " 
                + "file variable access. : \n" + e));
        }
        return true ;
    } //SetGetPathListDemo   

    // The AllFiles property gets or sets the permitted access to all files.
    // The AllLocalFiles property gets or sets the permitted access to 
    // all local files.
    private boolean AllFilesDemo() 
    {
        try {
            Console.WriteLine("***************************************" 
                + "*****************\n");
            
            FileIOPermission fileIOPerm1;
            Console.WriteLine("Creating a FileIOPermission and adding " 
                + "read access for all files");
            fileIOPerm1 = new FileIOPermission(
                FileIOPermissionAccess.AllAccess, 
                "C:\\Examples\\Test\\TestFile.txt");
            fileIOPerm1.set_AllFiles ( FileIOPermissionAccess.Read);
            Console.WriteLine(("AllFiles access = " 
                + fileIOPerm1.get_AllFiles()));
            Console.WriteLine("Adding AllAccess rights for local files.");
            fileIOPerm1.set_AllLocalFiles (FileIOPermissionAccess.AllAccess);
            Console.WriteLine(("AllLocalFiles access = " 
                + fileIOPerm1.get_AllLocalFiles()));
        } 
        catch(ArgumentException e) {
            Console.WriteLine(e);
            return false ;
        }
        return true ;
    } //AllFilesDemo

    // Invoke all demos.
    public boolean RunDemo() 
    {
        boolean ret = true;
        boolean retTmp;
        // Call the IsSubsetOfPath demo.
        if (retTmp = IsSubsetOfDemo()) {
            Console.get_Out().WriteLine("IsSubsetOf demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("IsSubsetOf demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the Union demo.
        if (retTmp = UnionDemo()) {
            Console.get_Out().WriteLine("Union demo completed successfully.");
        }
        else {
            Console.get_Out().WriteLine("Union demo failed.");
        }
        ret = retTmp && ret;
        // Call the Intersect demo.
        if (retTmp = IntersectDemo()) {
            Console.get_Out().WriteLine("Intersect demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("Intersect demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the Copy demo.
        if (retTmp = CopyDemo()) {
            Console.get_Out().WriteLine("Copy demo completed successfully.");
        }
        else {
            Console.get_Out().WriteLine("Copy demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the ToFromXml demo.
        if (retTmp = ToFromXmlDemo()) {
            Console.get_Out().WriteLine("ToFromXml demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("ToFromXml demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the SetGetPathList demo.
        if (retTmp = SetGetPathListDemo()) {
            Console.get_Out().WriteLine("SetGetPathList demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("SetGetPathList demo failed.");
        }
        ret = retTmp && ret;
        
        // Call the AllFiles demo.
        if (retTmp = AllFilesDemo()) {
            Console.get_Out().WriteLine("AllFiles demo completed " 
                + "successfully.");
        }
        else {
            Console.get_Out().WriteLine("AllFiles demo failed.");
        }
        ret = retTmp && ret;      
        return ret ;
    } //RunDemo

    // Test harness.
    public static void main(String[] args)
    {
        try {
            FileIOPermissionDemo democase =  new FileIOPermissionDemo();
            boolean ret = democase.RunDemo();
            if (ret) {
                Console.get_Out().WriteLine("FileIOPermission demo " 
                    + "completed successfully.");
                Console.get_Out().WriteLine("Press the Enter key to exit.");
                String consoleInput = Console.ReadLine();
                System.Environment.set_ExitCode(100);
            }
            else {
                Console.get_Out().WriteLine("FileIOPermission demo failed.");
                Console.get_Out().WriteLine("Press the Enter key to exit.");
                String consoleInput = Console.ReadLine();
                System.Environment.set_ExitCode(101);
            }
        }
        catch(System.Exception e) {
            Console.get_Out().WriteLine("FileIOPermission demo failed");
            Console.WriteLine(e.ToString());
            Console.get_Out().WriteLine("Press the Enter key to exit.");
            String consoleInput = Console.ReadLine();
            System.Environment.set_ExitCode(101);
        }
    } //main
} //FileIOPermissionDemo

// This class generates FileIOPermission objects.
class FileIOGenerator
{
    private String myFile[] =  {"C:\\Examples\\Test\\TestFile.txt", 
        "C:\\Examples\\Test\\", "C:\\Examples\\Test\\..", "C:\\Temp"};   
    private FileIOPermissionAccess myAccess[] = {
        FileIOPermissionAccess.AllAccess, 
        FileIOPermissionAccess.Append, 
        FileIOPermissionAccess.NoAccess, 
        FileIOPermissionAccess.PathDiscovery, 
        FileIOPermissionAccess.Read, 
        FileIOPermissionAccess.Write};   
    
    private int fileIndex = 0;

    public FileIOGenerator() 
    {
        ResetIndex();
    } //FileIOGenerator

    public void ResetIndex() 
    {
        fileIndex = 0;
    } //ResetIndex   

    // Create a FileIOPermission using FileIOPermissionAccess 
    // that is passed in.
    public boolean CreateFilePath(FileIOPermission fileIOPerm[], String file[], 
        FileIOPermissionAccess fpa) 
    {
        if (fileIndex == myFile.length) {
            fileIOPerm[0] = new FileIOPermission(PermissionState.None);

            file[0] = "";
            fileIndex++;
            return true ;
        }
        if (fileIndex > myFile.length) {
            fileIOPerm[0] = null;
            file[0] = "";
            return false ;
        }
        file[0] = myFile[fileIndex++];
        
        try {
            fileIOPerm[0] = new FileIOPermission(fpa, file[0]);
            return true ;
        }
        catch(System.Exception e) {
            Console.WriteLine(("Cannot create FileIOPermission: " 
                + file[0] + " " + e));
            fileIOPerm[0] = new FileIOPermission(PermissionState.None);
            file[0] = "";
            return true ;
        }
    } //CreateFilePath
} //FileIOGenerator 

Vererbungshierarchie

System.Object
   System.Security.CodeAccessPermission
    System.Security.Permissions.FileIOPermission

Threadsicherheit

Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.

Plattformen

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

FileIOPermission-Member
System.Security.Permissions-Namespace
FileIOPermissionAccess
FileIOPermissionAttribute

Weitere Ressourcen

Sicherheitsberechtigungen
Anfordern von Berechtigungen