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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)

public PrecedenceConstraints PrecedenceConstraints { get; }

Property Value

Type: Microsoft.SqlServer.Dts.Runtime.PrecedenceConstraints
The collection of the PrecedenceConstraint objects.

Implements

IDTSSequence.PrecedenceConstraints

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

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