SynchronizationAttribute Classe

Definição

public ref class SynchronizationAttribute : System::Runtime::Remoting::Contexts::ContextAttribute, System::Runtime::Remoting::Contexts::IContributeClientContextSink, System::Runtime::Remoting::Contexts::IContributeServerContextSink

[System.AttributeUsage(System.AttributeTargets.Class)]
[System.Serializable]
public class SynchronizationAttribute : System.Runtime.Remoting.Contexts.ContextAttribute, System.Runtime.Remoting.Contexts.IContributeClientContextSink, System.Runtime.Remoting.Contexts.IContributeServerContextSink

[System.AttributeUsage(System.AttributeTargets.Class)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public class SynchronizationAttribute : System.Runtime.Remoting.Contexts.ContextAttribute, System.Runtime.Remoting.Contexts.IContributeClientContextSink, System.Runtime.Remoting.Contexts.IContributeServerContextSink

[System.AttributeUsage(System.AttributeTargets.Class)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Security.SecurityCritical]
public class SynchronizationAttribute : System.Runtime.Remoting.Contexts.ContextAttribute, System.Runtime.Remoting.Contexts.IContributeClientContextSink, System.Runtime.Remoting.Contexts.IContributeServerContextSink

[<System.AttributeUsage(System.AttributeTargets.Class)>]
[<System.Serializable>]
type SynchronizationAttribute = class
    inherit ContextAttribute
    interface IContributeServerContextSink
    interface IContributeClientContextSink

[<System.AttributeUsage(System.AttributeTargets.Class)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type SynchronizationAttribute = class
    inherit ContextAttribute
    interface IContributeServerContextSink
    interface IContributeClientContextSink

[<System.AttributeUsage(System.AttributeTargets.Class)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Security.SecurityCritical>]
type SynchronizationAttribute = class
    inherit ContextAttribute
    interface IContributeServerContextSink
    interface IContributeClientContextSink

Public Class SynchronizationAttribute
Inherits ContextAttribute
Implements IContributeClientContextSink, IContributeServerContextSink

Herança

Object

Attribute

ContextAttribute

SynchronizationAttribute

Atributos

AttributeUsageAttribute SerializableAttribute ComVisibleAttribute SecurityCriticalAttribute

Implementações

IContributeClientContextSink IContributeServerContextSink

Exemplos

O exemplo de código seguinte demonstra a utilização do SynchronizationAttribute. Para o código completo do exemplo, veja o exemplo da AsyncResult classe.

// Context-bound type with the Synchronization context attribute.

[Synchronization]
public ref class SampleSynchronized: public ContextBoundObject
{
public:

   // A method that does some work, and returns the square of the given number.
   int Square( int i )
   {
      Console::Write( "The hash of the thread executing " );
      Console::WriteLine( "SampleSynchronized::Square is: {0}", Thread::CurrentThread->GetHashCode() );
      return i * i;
   }

};

// Context-bound type with the Synchronization context attribute.
[Synchronization()]
public class SampleSynchronized : ContextBoundObject {

    // A method that does some work, and returns the square of the given number.
    public int Square(int i)  {

        Console.Write("The hash of the thread executing ");
        Console.WriteLine("SampleSynchronized.Square is: {0}",
                             Thread.CurrentThread.GetHashCode());
        return i*i;
    }
}

' Context-bound type with the Synchronization context attribute.
<Synchronization()> Public Class SampleSynchronized
   Inherits ContextBoundObject
   
   ' A method that does some work, and returns the square of the given number.
   Public Function Square(i As Integer) As Integer
      
      Console.Write("The hash of the thread executing ")
      Console.WriteLine("SampleSynchronized.Square is: {0}", Thread.CurrentThread.GetHashCode())
      Return i * i
   End Function 

End Class

Observações

Quando este atributo é aplicado a um objeto, apenas um thread pode estar a ser executado em todos os contextos que partilham uma instância desta propriedade. Isto é feito através de sumidouros que intercetam e serializam chamadas recebidas para os respetivos contextos. Se a propriedade estiver marcada para reentrada, então as chamadas também são interceptadas. A interceção de callout permite que outros threads em espera entrem no domínio de sincronização para maximizar o rendimento.