SynchronizationAttribute Klass

Definition

public ref class SynchronizationAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Runtime.InteropServices.ComVisible(false)]
public sealed class SynchronizationAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)>]
[<System.Runtime.InteropServices.ComVisible(false)>]
type SynchronizationAttribute = class
    inherit Attribute

Public NotInheritable Class SynchronizationAttribute
Inherits Attribute

Arv

Object

Attribute

SynchronizationAttribute

Attribut

AttributeUsageAttribute ComVisibleAttribute

Exempel

I följande kodexempel visas användningen av SynchronizationAttribute typen.

using System;
using System.EnterpriseServices;
using System.Reflection;

// References:
// System.EnterpriseServices

// This is equivalent to [Synchronization(SynchronizationOption.Required)].
[Synchronization]
public class SynchronizationAttribute_Ctor : ServicedComponent
{
}

[Synchronization(SynchronizationOption.Disabled)]
public class SynchronizationAttribute_Ctor_SynchronizationOption : ServicedComponent
{
}

[Synchronization(SynchronizationOption.RequiresNew)]
public class SynchronizationAttribute_Value : ServicedComponent
{
    public void ValueExample()
    {
        // Get the SynchronizationAttribute applied to the class.
        SynchronizationAttribute attribute =
            (SynchronizationAttribute)Attribute.GetCustomAttribute(
            this.GetType(),
            typeof(SynchronizationAttribute),
            false);

        // Display the value of the attribute's Value property.
        Console.WriteLine("SynchronizationAttribute.Value: {0}",
            attribute.Value);
    }
}

Imports System.EnterpriseServices
Imports System.Reflection


' References:
' System.EnterpriseServices

' This is equivalent to [Synchronization(SynchronizationOption.Required)].
<Synchronization()>  _
Public Class SynchronizationAttribute_Ctor
    Inherits ServicedComponent
End Class

<Synchronization(SynchronizationOption.Disabled)>  _
Public Class SynchronizationAttribute_Ctor_SynchronizationOption
    Inherits ServicedComponent
End Class

<Synchronization(SynchronizationOption.RequiresNew)>  _
Public Class SynchronizationAttribute_Value
    Inherits ServicedComponent
    
    Public Sub ValueExample() 
        ' Get the SynchronizationAttribute applied to the class.
        Dim attribute As SynchronizationAttribute = CType(Attribute.GetCustomAttribute(Me.GetType(), GetType(SynchronizationAttribute), False), SynchronizationAttribute)
        
        ' Display the value of the attribute's Value property.
        MsgBox("SynchronizationAttribute.Value: " & attribute.Value)
    
    End Sub
End Class

Kommentarer

Både transaktionsaktivering och jit-aktivering (just-in-time) aktiverar synkronisering automatiskt.

Mer information om hur du använder attribut finns i Attribut.

Om du tillämpar SynchronizationAttribute på ett kontextbundet objekt skapas en väntereferens och en automatisk återställningshändelse, som inte är deterministiskt skräp som samlas in. Därför bör du inte skapa ett stort antal kontextbundna objekt som markerats med SynchronizationAttribute inom en kort tidsperiod.