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Package.PrecedenceConstraints Property

Returns the collection of PrecedenceConstraint objects. This field is read-only.

Namespace: Microsoft.SqlServer.Dts.Runtime
Assembly: Microsoft.SqlServer.ManagedDTS (in microsoft.sqlserver.manageddts.dll)

public PrecedenceConstraints PrecedenceConstraints { get; }
/** @property */
public final PrecedenceConstraints get_PrecedenceConstraints ()

public final function get PrecedenceConstraints () : PrecedenceConstraints

Property Value

A PrecedenceConstraints collection that contains PrecedenceConstraint objects.

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.


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);

        }
    }
}

Sample Output:

Precedence constraints in package = 1

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server 2005.

Target Platforms

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