PropertyInfo.GetIndexParameters-Methode

Artikel
08/20/2007

Gibt beim Überschreiben in einer abgeleiteten Klasse ein Array aller Indexparameter für die Eigenschaft zurück.

Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public MustOverride Function GetIndexParameters As ParameterInfo()
'Usage
Dim instance As PropertyInfo
Dim returnValue As ParameterInfo()

returnValue = instance.GetIndexParameters

public abstract ParameterInfo[] GetIndexParameters ()

public:
virtual array<ParameterInfo^>^ GetIndexParameters () abstract

public abstract ParameterInfo[] GetIndexParameters ()

public abstract function GetIndexParameters () : ParameterInfo[]

Rückgabewert

Ein Array vom Typ ParameterInfo, das die Parameter für die Indizes enthält.

Hinweise

Extrahieren Sie alle benötigten Parameterinformationen aus dem zurückgegebenen Array.

Um die GetIndexParameters-Methode zu verwenden, rufen Sie zunächst den Type der Klasse ab. Über Type rufen Sie PropertyInfo ab. Verwenden Sie die GetIndexParameters-Methode aus PropertyInfo.

Beispiel

Im folgenden Beispiel werden die Indexparameter der angegebenen Eigenschaft angezeigt.

Imports System
Imports System.Reflection
Imports System.Collections
Imports Microsoft.VisualBasic

' A test class that has some properties.
Public Class MyProperty

    ' Define a simple string property.
    Private myCaption As String = "A Default caption"
    Public Property Caption() As String
        Get
            Return myCaption
        End Get
        Set(ByVal Value As String)
            If myCaption <> value Then
                myCaption = value
            End If
        End Set
    End Property

    ' A very limited indexed default property that gets or
    ' sets one of four string values.
    Private strings() As String = {"abc", "def", "ghi", "jkl"}
    Public Default Property Item(ByVal Index As Integer) As String
        Get
            Return strings(Index)
        End Get
        Set
            strings(Index) = Value
        End Set 
    End Property
End Class

Public Class Example

    Public Shared Function Main() As Integer

        ' Get the type and PropertyInfo.
        Dim t As Type = GetType(MyProperty)
        Dim pi As PropertyInfo = t.GetProperty("Caption")

        ' Get an array containing the parameters (if any).
        Dim params As ParameterInfo() = pi.GetIndexParameters()
        Console.WriteLine(vbCrLf & t.FullName & "." & pi.Name & _
           " has " & params.GetLength(0) & " parameters.")

        ' Display a property that has parameters.
        pi = t.GetProperty("Item")
        params = pi.GetIndexParameters()
        Console.WriteLine(t.FullName & "." & pi.Name & _
           " has " & params.GetLength(0) & " parameters.")
        For Each p As ParameterInfo In params
            Console.WriteLine("   Parameter: " & p.Name)
        Next

        Return 0
    End Function
End Class

' This example produces the following output:
' MyProperty.Caption has 0 parameters.
' MyProperty.Item has 1 parameters.
'    Parameter: Index

using System;
using System.Reflection;
 
// A class that contains some properties.
public class MyProperty   
{
    // Define a simple string property.
    private string caption = "A Default caption";
    public string Caption
    {
        get{return caption;}
        set {if(caption!=value) {caption = value;}
        }
    }

    // A very limited indexer that gets or sets one of four 
    // strings.
    private string[] strings = {"abc", "def", "ghi", "jkl"};
    public string this[int Index]    
    {
        get
        {
            return strings[Index];
        }
        set
        {
            strings[Index] = value;
        }
    }
}
 
class Mypropertyinfo
{
    public static int Main()
    {
        // Get the type and PropertyInfo.
        Type t = Type.GetType("MyProperty");
        PropertyInfo pi = t.GetProperty("Caption");
 
        // Get the public GetIndexParameters method.
        ParameterInfo[] parms = pi.GetIndexParameters();
        Console.WriteLine("\r\n" + t.FullName + "." + pi.Name
            + " has " + parms.GetLength(0) + " parameters.");
 
        // Display a property that has parameters. The default 
        // name of an indexer is "Item".
        pi = t.GetProperty("Item");
        parms = pi.GetIndexParameters();
        Console.WriteLine(t.FullName + "." + pi.Name + " has " + 
            parms.GetLength(0) + " parameters.");
        foreach( ParameterInfo p in parms )
        {
            Console.WriteLine("   Parameter: " + p.Name);
        }

        return 0;
    }
}
/*
 This example produces the following output:
 MyProperty.Caption has 0 parameters.
 MyProperty.Item has 1 parameters.
    Parameter: Index
 */

using namespace System;
using namespace System::Reflection;

// A class that contains some properties.
public ref class MyProperty
{
private:

   // Define a simple string property.
   String^ caption;

public:

   property String^ Caption 
   {
      String^ get()
      {
         return caption;
      }

      void set( String^ value )
      {
         if ( caption != value )
         {
            caption = value;
         }
      }

   }

private:

   // A very limited indexer that gets or sets one of four 
   // strings.
   array<String^>^strings;

public:
   MyProperty()
   {
      array<String^>^temp0 = {"abc","def","ghi","jkl"};
      strings = temp0;
   }


   property String^ Item [int]
   {
      String^ get( int Index )
      {
         return strings[ Index ];
      }

      void set( int Index, String^ value )
      {
         strings[ Index ] = value;
      }

   }

};

int main()
{
   
   // Get the type and PropertyInfo.
   Type^ t = Type::GetType( "MyProperty" );
   PropertyInfo^ pi = t->GetProperty( "Caption" );
   
   // Get the public GetIndexParameters method.
   array<ParameterInfo^>^parms = pi->GetIndexParameters();
   Console::WriteLine( "\n{0}.{1} has {2} parameters.", t->FullName, pi->Name, parms->GetLength( 0 ) );
   
   // Display a property that has parameters. 
   pi = t->GetProperty( "Item" );
   parms = pi->GetIndexParameters();
   Console::WriteLine( "{0}.{1} has {2} parameters.", t->FullName, pi->Name, parms->GetLength( 0 ) );
   for ( int i = 0; i < parms->GetLength( 0 ); i++ )
   {
      Console::WriteLine( "    Parameter: {0}", parms[ i ]->Name );

   }
   return 0;
}

/*
 This example produces the following output:
 MyProperty.Caption has 0 parameters.
 MyProperty.Item has 1 parameters.
    Parameter: Index
 */

import System.*;
import System.Reflection.*;

// A class that contains some properties.
public class MyProperty
{
    // Define a simple string property.
    private String caption = "A Default caption";

    /** @property 
     */
    public String get_Caption()
    {
        return caption ;
    } //get_Caption
    /** @property 
     */
    public void set_Caption ( String value )
    {
        if (caption != value) {
            caption = value;
        }
    } //set_Caption
   
    // A very limited indexer that gets or sets one of four 
    // strings.
    private String strings[] =  {"abc", "def", "ghi", "jkl"};
    /** @property 
     */
    public String get_Item(int Index)
    {
        return strings[Index] ;
    } //get_Item
    /** @property 
     */
    public void set_Item (int Index,String value)
    {
        strings[Index] = value;
    } //set_Item
} //MyProperty

class MyPropertyInfo
{   
    public static void main(String[] args)
    {
        // Get the type and PropertyInfo.
        Type t = Type.GetType("MyProperty");
        PropertyInfo pi = t.GetProperty("Caption");

        // Get the public GetIndexParameters method.
        ParameterInfo parms[] = pi.GetIndexParameters();
        Console.WriteLine(("\r\n" + t.get_FullName() + "." + pi.get_Name() 
            + " has " + parms.GetLength(0) + " parameters."));

        // Display a property that has parameters. The default 
        // name of an indexer is "Item".
        pi = t.GetProperty("Item");
        parms = pi.GetIndexParameters();
        Console.WriteLine((t.get_FullName() + "." + pi.get_Name() + " has " 
            + parms.GetLength(0) + " parameters."));

        for(int iCtr=0; iCtr< parms.length; iCtr++) {
            ParameterInfo p = parms[iCtr];
            Console.WriteLine(("   Parameter: " + p.get_Name()));
        }
    } //main
} //MyPropertyInfo
/*
This example produces the following output:
MyProperty.Caption has 0 parameters.
MyProperty.Item has 1 parameters.
Parameter: Index
*/

import System;
import System.Reflection;
 
//Make a property
 public class Myproperty   
 {
    private var caption : String = "A Default caption";
    public function get Caption() : String {
        return caption;
    }
    public function set Caption(value:String) {
        if(caption!=value) caption = value;
    }
 }
 
 class Mypropertyinfo
 {
    public static function Main() : void
       {
       Console.WriteLine ("\nReflection.PropertyInfo");
 
       //Get the type and PropertyInfo
       var MyType : Type = Type.GetType("Myproperty");
       var Mypropertyinfo : PropertyInfo = MyType.GetProperty("Caption");
 
       //Get the public GetIndexParameters Method
       var Myparameterinfoarray : ParameterInfo[] =
          Mypropertyinfo.GetIndexParameters();
       Console.Write ("\n" + MyType.FullName + "." + Mypropertyinfo.Name
          + " has " + Myparameterinfoarray.GetLength(0) + " parameters");
     }
 }
 Mypropertyinfo.Main();
 /*
 Produces the following output
 
 Reflection.PropertyInfo
 Myproperty.Caption has 0 parameters
 */

.NET Framework-Sicherheit

ReflectionPermission beim Laden mit später Bindung durch Mechanismen wie Type.InvokeMember. Zugeordnete Enumeration: ReflectionPermissionFlag.MemberAccess.
ReflectionPermission zum Reflektieren von nicht sichtbaren Objekten. Zugeordnete Enumeration: ReflectionPermissionFlag.TypeInformation

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, 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.

Freigeben über

PropertyInfo.GetIndexParameters-Methode

Syntax

Rückgabewert

Hinweise

Beispiel

.NET Framework-Sicherheit

Plattformen

Versionsinformationen

.NET Framework

.NET Compact Framework

Siehe auch

Referenz

Zusätzliche Ressourcen