Package.PrecedenceConstraints Properti

Definisi

Ruang nama:

Microsoft.SqlServer.Dts.Runtime

Rakitan:

Microsoft.SqlServer.ManagedDTS.dll

Mendapatkan koleksi PrecedenceConstraint objek. Bidang ini hanya-baca.

public:
 property Microsoft::SqlServer::Dts::Runtime::PrecedenceConstraints ^ PrecedenceConstraints { Microsoft::SqlServer::Dts::Runtime::PrecedenceConstraints ^ get(); };

public Microsoft.SqlServer.Dts.Runtime.PrecedenceConstraints PrecedenceConstraints { get; }

member this.PrecedenceConstraints : Microsoft.SqlServer.Dts.Runtime.PrecedenceConstraints

Public ReadOnly Property PrecedenceConstraints As PrecedenceConstraints

Nilai Properti

PrecedenceConstraints

Koleksi PrecedenceConstraint objek.

Penerapan

PrecedenceConstraints

Contoh

Contoh kode berikut menambahkan dua tugas ke paket, dan menempatkan prioritas yang membatasi di antaranya. Kemudian menghitung jumlah batasan dalam koleksi paket.

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  

Contoh Output:

Precedence constraints in package = 1

Keterangan

Mengembalikan kumpulan PrecedenceConstraint objek yang berisi informasi tentang kondisi yang harus terjadi sebelum langkah dapat dirilis untuk dieksekusi. Untuk informasi selengkapnya tentang batasan prioritas, lihat Batasan Prioritas.