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ForEachLoop.PrecedenceConstraints Özelliği

Döndürür bir PrecedenceConstraints koleksiyon tüm ilişkili önceliği kısıtlamaları içeren ForEachLoop.

Ad Alanı:  Microsoft.SqlServer.Dts.Runtime
Derleme:  Microsoft.SqlServer.ManagedDTS (Microsoft.SqlServer.ManagedDTS içinde.dll)

Sözdizimi

'Bildirim
Public ReadOnly Property PrecedenceConstraints As PrecedenceConstraints
    Get
'Kullanım
Dim instance As ForEachLoop
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

Uygulamalar

IDTSSequence.PrecedenceConstraints

Açıklamalar

Derlemedeki nesneleri yürütme sırasını tarafından belirlenen PrecedenceConstraints eklenen kapsayıcı.PrecedenceConstraintsYürütme dallanma esas başarı, başarısızlık veya bir yürütülebilir dosya içinde tamamlanmadan izin koleksiyon.

Örnekler

Aşağıdaki kod örneği oluşturur bir ForEachLoop kullanarak bazı özelliklerini ayarlar ve Properties koleksiyon.İki görevi eklenen Executables koleksiyon, ve bunlar arasında bir öncelik kısıtlaması konur.

// Create the package.
Package package = new Package();
// Add variables.
package.Variables.Add("Id", false, "User", 0);

// Create ForEachLoop task
Executables executables = package.Executables;
ForEachLoop forEachLoop = executables.Add("STOCK:FOREACHLOOP") as ForEachLoop;

// The ForEachLoop is a container. Add some task executables and
// create a precedence constraint. The tasks can run when
// certain conditions in the loop are met.
TaskHost thLoopMail = (TaskHost)forEachLoop.Executables.Add("STOCK:SendMailTask");
TaskHost thLoopInsert = (TaskHost)forEachLoop.Executables.Add("STOCK:BulkInsertTask");
Executables loopExecs = forEachLoop.Executables;
Console.WriteLine("Number of Executables in ForLoop: {0}", loopExecs.Count);

// Like other containers, precedence constraints can be set on the
// contained tasks.
PrecedenceConstraint pc = forEachLoop.PrecedenceConstraints.Add((Executable)thLoopMail, thLoopInsert);
PrecedenceConstraints pcs = forEachLoop.PrecedenceConstraints;
Console.WriteLine("Number of precedence constraints: {0}", pcs.Count);

' Create the package.
Dim package As Package =  New Package() 
' Add variables.
package.Variables.Add("Id", False, "User", 0)
 
' Create ForEachLoop task
Dim executables As Executables =  package.Executables 
Dim forEachLoop As ForEachLoop =  executables.Add("STOCK:FOREACHLOOP") as ForEachLoop 
 
' The ForEachLoop is a container. Add some task executables and
' create a precedence constraint. The tasks can run when
' certain conditions in the loop are met.
Dim thLoopMail As TaskHost = CType(forEachLoop.Executables.Add("STOCK:SendMailTask"), TaskHost)
Dim thLoopInsert As TaskHost = CType(forEachLoop.Executables.Add("STOCK:BulkInsertTask"), TaskHost)
Dim loopExecs As Executables =  forEachLoop.Executables 
Console.WriteLine("Number of Executables in ForLoop: {0}", loopExecs.Count)
 
' Like other containers, precedence constraints can be set on the
' contained tasks.
Dim pc As PrecedenceConstraint =  forEachLoop.PrecedenceConstraints.Add(CType(thLoopMail,thLoopInsert, Executable)) 
Dim pcs As PrecedenceConstraints =  forEachLoop.PrecedenceConstraints 
Console.WriteLine("Number of precedence constraints: {0}", pcs.Count)

Örnek Çıktı:

ForLoop içindeki Yürütülebilirler sayısı: 2

Öncelik kısıtlamaları sayısı: 1