Package.PrecedenceConstraints Property
Gets the collection of the PrecedenceConstraint objects. This field is read-only.
Namespace: Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in Microsoft.SqlServer.ManagedDTS.dll)
Syntax
'Declaration
Public ReadOnly Property PrecedenceConstraints As PrecedenceConstraints
Get
'Usage
Dim instance As Package
Dim value As PrecedenceConstraints
value = instance.PrecedenceConstraints
public PrecedenceConstraints PrecedenceConstraints { get; }
public:
virtual property PrecedenceConstraints^ PrecedenceConstraints {
PrecedenceConstraints^ get () sealed;
}
abstract PrecedenceConstraints : PrecedenceConstraints
override PrecedenceConstraints : PrecedenceConstraints
final function get PrecedenceConstraints () : PrecedenceConstraints
Property Value
Type: Microsoft.SqlServer.Dts.Runtime.PrecedenceConstraints
The collection of the PrecedenceConstraint objects.
Implements
IDTSSequence.PrecedenceConstraints
Remarks
Returns the collection of PrecedenceConstraint objects that contain information about conditions that must occur before a step can be released for execution. For more information about precedence constraints, see Precedence Constraints.
Examples
The following code example adds two tasks to the package, and places a precedence constraing between them. It then counts the number of constraints in the package collection.
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
using Microsoft.SqlServer.Dts.Tasks.FileSystemTask;
namespace DataFlow_Conceptual
{
class Program
{
static void Main(string[] args)
{
Package p = new Package();
// Add a File System task.
Executable eFileTask1 = p.Executables.Add("STOCK:FileSystemTask");
TaskHost thFileHost1 = eFileTask1 as TaskHost;
// Add a second File System task.
Executable eFileTask2 = p.Executables.Add("STOCK:FileSystemTask");
TaskHost thFileHost2 = eFileTask2 as TaskHost;
// Put a precedence constraint between the tasks.
// Set the constraint to be that thFileTask2 cannot run
// unless thFileTask1 completes.
PrecedenceConstraint pcFileTasks = p.PrecedenceConstraints.Add((Executable)thFileHost1, (Executable) thFileHost2);
pcFileTasks.Value = DTSExecResult.Completion;
// Return and show the count of precedence constraints in the package.
PrecedenceConstraints pCons = p.PrecedenceConstraints;
Console.WriteLine("Precedence constraints in package = {0}", pCons.Count);
}
}
}
Imports System
Imports System.Collections.Generic
Imports System.Text
Imports Microsoft.SqlServer.Dts.Runtime
Namespace Package_API
Class Program
Shared Sub Main(ByVal args() As String)
Dim app As Application = New Application()
Dim pkg As Package = New Package()
pkg = app.LoadPackage("C:\Program Files\Microsoft SQL Server\100\Samples\Integration Services\Package Samples\CalculatedColumns Sample\CalculatedColumns\CalculatedColumns.dtsx", Nothing)
' Show the package type
Console.WriteLine("The package type is {0}", pkg.PackageType)
End Sub
End Class
End Namespace
Sample Output:
Precedence constraints in package = 1