IMethodMessage-Schnittstelle

Definiert die Schnittstelle für Methodenmeldungen.

Namespace: System.Runtime.Remoting.Messaging
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Interface IMethodMessage
    Inherits IMessage
'Usage
Dim instance As IMethodMessage

[ComVisibleAttribute(true)] 
public interface IMethodMessage : IMessage

[ComVisibleAttribute(true)] 
public interface class IMethodMessage : IMessage

/** @attribute ComVisibleAttribute(true) */ 
public interface IMethodMessage extends IMessage

ComVisibleAttribute(true) 
public interface IMethodMessage extends IMessage

Hinweise

Mit einer Methodenmeldung werden Informationen zu und von Remotemethoden gesendet. Beispielsweise implementieren Meldungen für Remotemethodenaufrufe die IMethodMessage-Schnittstelle.

Beispiel

Der folgende Beispielcode veranschaulicht einen benutzerdefinierten Proxy, der RealProxy.Invoke überschreibt, um die Meldungsinformationen auf der Konsole auszugeben, und sofort beendet wird, ohne einen Remoteaufruf auszuführen.

<PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _
Public Class MyProxyClass
   Inherits RealProxy
   Private myObjectInstance As Object = Nothing
   Private myType As Type = Nothing
   
   Public Sub New(argType As Type)
      MyBase.New(argType)
      myType = argType
      myObjectInstance = Activator.CreateInstance(argType)
   End Sub 'New
   
   ' Overriding the Invoke method of RealProxy.
   Public Overrides Function Invoke(message As IMessage) As IMessage
      Dim myMethodMessage As IMethodMessage = CType(message, IMethodMessage)
      
      Console.WriteLine("**** Begin Invoke ****")
      Console.WriteLine(ControlChars.Tab + "Type is : " + myType.ToString())
      Console.WriteLine(ControlChars.Tab + "Method name : " + myMethodMessage.MethodName)
      
      Dim i As Integer
      For i = 0 To myMethodMessage.ArgCount - 1
         Console.WriteLine(ControlChars.Tab + "ArgName is : " + myMethodMessage.GetArgName(i))
         Console.WriteLine(ControlChars.Tab + "ArgValue is: " + myMethodMessage.GetArg(i))
      Next i
      
      If myMethodMessage.HasVarArgs Then
         Console.WriteLine(ControlChars.Tab + " The method have variable arguments!!")
      Else
         Console.WriteLine(ControlChars.Tab + " The method does not have variable arguments!!")
      End If 
      ' Dispatch the method call to the real object.
      Dim returnValue As Object = myType.InvokeMember(myMethodMessage.MethodName, _
                     BindingFlags.InvokeMethod, Nothing, myObjectInstance, myMethodMessage.Args)
      Console.WriteLine("**** End Invoke ****")
      
      ' Build the return message to pass back to the transparent proxy.
      Dim myReturnMessage As New ReturnMessage(returnValue, Nothing, 0, Nothing, _
                                                         CType(message, IMethodCallMessage))
      Return myReturnMessage
   End Function 'Invoke
End Class 'MyProxyClass

[PermissionSet(SecurityAction.Demand, Name="FullTrust")]
public class MyProxyClass : RealProxy
{
   private Object  myObjectInstance  = null;
   private Type    myType      = null;

   public MyProxyClass(Type argType) : base(argType)
   {
      myType = argType;
      myObjectInstance = Activator.CreateInstance(argType);
   }

   // Overriding the Invoke method of RealProxy.
   public override IMessage Invoke(IMessage message)
   {
      IMethodMessage myMethodMessage = (IMethodMessage)message;

      Console.WriteLine("**** Begin Invoke ****");
      Console.WriteLine("\tType is : " + myType);
      Console.WriteLine("\tMethod name : " +  myMethodMessage.MethodName);

      for (int i=0; i < myMethodMessage.ArgCount; i++)
      {
         Console.WriteLine("\tArgName is : " + myMethodMessage.GetArgName(i));
         Console.WriteLine("\tArgValue is: " + myMethodMessage.GetArg(i));
      }

      if(myMethodMessage.HasVarArgs)
          Console.WriteLine("\t The method have variable arguments!!");
      else
          Console.WriteLine("\t The method does not have variable arguments!!");

      // Dispatch the method call to the real object.
      Object returnValue = myType.InvokeMember( myMethodMessage.MethodName, BindingFlags.InvokeMethod, null,
                                           myObjectInstance, myMethodMessage.Args );
      Console.WriteLine("**** End Invoke ****");

      // Build the return message to pass back to the transparent proxy.
      ReturnMessage myReturnMessage = new ReturnMessage( returnValue, null, 0, null,
          (IMethodCallMessage)message );
      return myReturnMessage;
   }
}

// This class requires full trust
[PermissionSetAttribute(SecurityAction::Demand, Name = "FullTrust")]
public ref class MyProxyClass: public RealProxy
{
private:
   Object^ myObjectInstance;
   Type^ myType;

public:
   MyProxyClass( Type^ argType )
      : RealProxy( argType )
   {
      myType = argType;
      myObjectInstance = Activator::CreateInstance( argType );
   }

   // Overriding the Invoke method of RealProxy.
   virtual IMessage^ Invoke( IMessage^ message ) override
   {
      IMethodMessage^ myMethodMessage = dynamic_cast<IMethodMessage^>(message);
      Console::WriteLine( "**** Begin Invoke ****" );
      Console::WriteLine( "\tType is : {0}", myType );
      Console::WriteLine( "\tMethod name : {0}", myMethodMessage->MethodName );
      for ( int i = 0; i < myMethodMessage->ArgCount; i++ )
      {
         Console::WriteLine( "\tArgName is : {0}", myMethodMessage->GetArgName( i ) );
         Console::WriteLine( "\tArgValue is: {0}", myMethodMessage->GetArg( i ) );

      }
      if ( myMethodMessage->HasVarArgs )
            Console::WriteLine( "\t The method have variable arguments!!" );
      else
            Console::WriteLine( "\t The method does not have variable arguments!!" );

      
      // Dispatch the method call to the real Object*.
      Object^ returnValue = myType->InvokeMember( myMethodMessage->MethodName, BindingFlags::InvokeMethod, nullptr, myObjectInstance, myMethodMessage->Args );
      Console::WriteLine( "**** End Invoke ****" );
      
      // Build the return message to pass back to the transparent proxy.
      ReturnMessage^ myReturnMessage = gcnew ReturnMessage( returnValue,nullptr,0,nullptr,dynamic_cast<IMethodCallMessage^>(message) );
      return myReturnMessage;
   }
};

Plattformen

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

IMethodMessage-Member
System.Runtime.Remoting.Messaging-Namespace