HOW TO：建立共用物件及設定其大小和逾時限制

衍生自 System.EnterpriseServices.ServicedComponent 類別的類別可以使用 COM+ 物件共用，以免除從頭開始啟動物件的額外負擔。相反地，物件啟動時會從集區取出。如需詳細資訊，請參閱物件共用。

建立共用物件並設定其大小和逾時限制

1. 定義衍生自 System.EnterpriseServices.ServicedComponent 類別的類別，然後將 ObjectPoolingAttribute 屬性套用至該類別。例如，以下程式碼定義名為 TestObjectPooling 的類別，並為該類別設定 MinPoolSize、MaxPoolSize 和 CreationTimeout 屬性。

   <ObjectPooling(MinPoolSize := 2, MaxPoolSize := 5, _
   CreationTimeout := 20000)> _
   Public Class TestObjectPooling 
   Inherits ServicedComponent
   End Class 
   

   [ObjectPooling(Enabled=true, MinPoolSize=2, MaxPoolSize=5, CreationTimeout=20000)]
   public class TestObjectPooling : ServicedComponent
   {
   }
   

2. 覆寫 System.EnterpriseServices.ServicedComponent 類別的 Activate、Deactivate 和 CanBePooled 方法。

3. 在用戶端應用程式中測試共用物件：

   1. 為共用物件類別建立執行個體，並呼叫共用物件的方法。例如，以下程式碼會建立 TestObjectPooling 類別的執行個體並呼叫 Perform 方法。

      Public Class App
          Overloads Public Shared Sub Main(args() As String)
             Dim order As New TestObjectPooling()
                  order.Perform()
      
      

      public class App
      {
          public static int Main(string[] args)
          {
             TestObjectPooling order = new TestObjectPooling();
             order.Perform();
      
      

   2. 呼叫 DisposeObject 方法，將物件傳回集區。

      ServicedComponent.DisposeObject (order)
      

      ServicedComponent.DisposeObject (order);
      

範例

<ObjectPooling(MinPoolSize := 2, MaxPoolSize := 5, _
CreationTimeout := 20000)> _
Public Class TestObjectPooling 
Inherits ServicedComponent
      Public Sub Perform ()
            ' Method contents go here.
      End Sub 
      Protected Overrides Sub Activate()
            ' Called when removed from the pool.
      End Sub 
      Protected Overrides Sub Deactivate()
            ' Called before deactivating or placing back in pool.
      End Sub 
      Protected Overrides Function CanBePooled() As Boolean
            ' Called after Deactivate. Indicate your vote here.
            Return True
      End Function 
End Class 

[ObjectPooling(Enabled=true, MinPoolSize=2, MaxPoolSize=5, CreationTimeout=20000)]
public class TestObjectPooling : ServicedComponent
{
      public void Perform ()
      {
         // Method contents go here.
      }
      protected override void Activate()
      {
         // Called when removed from the pool.
      }
      protected override void Deactivate()
      {
         // Called before deactivating or placing back in pool.
      }
      protected override bool CanBePooled()
      {
         // Called after Deactivate. Indicate your vote here.
         return true;
      }
}
 

請參閱

參考

ObjectPoolingAttribute
System.EnterpriseServices Namespace

概念

可用 COM+ 服務摘要
物件共用

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