RealProxy.Invoke(IMessage) Method

Reference

Definition

Namespace:: System.Runtime.Remoting.Proxies

Assembly:: mscorlib.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

When overridden in a derived class, invokes the method that is specified in the provided IMessage on the remote object that is represented by the current instance.

public:
 abstract System::Runtime::Remoting::Messaging::IMessage ^ Invoke(System::Runtime::Remoting::Messaging::IMessage ^ msg);

public abstract System.Runtime.Remoting.Messaging.IMessage Invoke (System.Runtime.Remoting.Messaging.IMessage msg);

abstract member Invoke : System.Runtime.Remoting.Messaging.IMessage -> System.Runtime.Remoting.Messaging.IMessage

Public MustOverride Function Invoke (msg As IMessage) As IMessage

Parameters

msg: IMessage

A IMessage that contains a IDictionary of information about the method call.

Returns

IMessage

The message returned by the invoked method, containing the return value and any out or ref parameters.

Examples

virtual IMessage^ Invoke( IMessage^ myMessage ) override
{
   Console::WriteLine( "MyProxy 'Invoke method' Called..." );
   if ( dynamic_cast<IMethodCallMessage^>(myMessage) )
   {
      Console::WriteLine( "IMethodCallMessage*" );
   }

   if ( dynamic_cast<IMethodReturnMessage^>(myMessage) )
   {
      Console::WriteLine( "IMethodReturnMessage*" );
   }

   if ( dynamic_cast<IConstructionCallMessage^>(myMessage) )
   {
      // Initialize a new instance of remote object
      IConstructionReturnMessage^ myIConstructionReturnMessage = this->InitializeServerObject( static_cast<IConstructionCallMessage^>(myMessage) );
      ConstructionResponse^ constructionResponse = gcnew ConstructionResponse( nullptr,static_cast<IMethodCallMessage^>(myMessage) );
      return constructionResponse;
   }

   IDictionary^ myIDictionary = myMessage->Properties;
   IMessage^ returnMessage;
   myIDictionary[ "__Uri" ] = myUri;

   // Synchronously dispatch messages to server.
   returnMessage = ChannelServices::SyncDispatchMessage( myMessage );

   // Pushing return value and OUT parameters back onto stack.
   IMethodReturnMessage^ myMethodReturnMessage = dynamic_cast<IMethodReturnMessage^>(returnMessage);
   return returnMessage;
}

public override IMessage Invoke(IMessage myMessage)
{
   Console.WriteLine("MyProxy 'Invoke method' Called...");
   if (myMessage is IMethodCallMessage)
   {
      Console.WriteLine("IMethodCallMessage");
   }
   if (myMessage is IMethodReturnMessage)
   {
      Console.WriteLine("IMethodReturnMessage");
   }
   if (myMessage is IConstructionCallMessage)
   {
      // Initialize a new instance of remote object
      IConstructionReturnMessage myIConstructionReturnMessage =
         this.InitializeServerObject((IConstructionCallMessage)myMessage);
      ConstructionResponse constructionResponse = new
         ConstructionResponse(null,(IMethodCallMessage) myMessage);
      return constructionResponse;
   }
   IDictionary myIDictionary = myMessage.Properties;
   IMessage returnMessage;
   myIDictionary["__Uri"] = myUri;

   // Synchronously dispatch messages to server.
   returnMessage = ChannelServices.SyncDispatchMessage(myMessage);
   // Pushing return value and OUT parameters back onto stack.
   IMethodReturnMessage myMethodReturnMessage = (IMethodReturnMessage)returnMessage;
   return returnMessage;
}

Public Overrides Function Invoke(myMessage As IMessage) As IMessage
   Console.WriteLine("MyProxy 'Invoke method' Called...")
   If TypeOf myMessage Is IMethodCallMessage Then
      Console.WriteLine("IMethodCallMessage")
   End If
   If TypeOf myMessage Is IMethodReturnMessage Then
      Console.WriteLine("IMethodReturnMessage")
   End If
   If TypeOf myMessage Is IConstructionCallMessage Then
      ' Initialize a new instance of remote object
      Dim myIConstructionReturnMessage As IConstructionReturnMessage = _
            Me.InitializeServerObject(CType(myMessage, IConstructionCallMessage))
      Dim constructionResponse As _
            New ConstructionResponse(Nothing, CType(myMessage, IMethodCallMessage))
      Return constructionResponse
   End If
   Dim myIDictionary As IDictionary = myMessage.Properties
   Dim returnMessage As IMessage
   myIDictionary("__Uri") = myUri
   ' Synchronously dispatch messages to server.
   returnMessage = ChannelServices.SyncDispatchMessage(myMessage)
   ' Pushing return value and OUT parameters back onto stack.
   Dim myMethodReturnMessage As IMethodReturnMessage = _
         CType(returnMessage, IMethodReturnMessage)
   Return returnMessage
End Function 'Invoke

Remarks

When the transparent proxy that is backed by the RealProxy is called, it delegates the calls to the Invoke method. The Invoke method transforms the message in the msg parameter into a IMethodCallMessage, and sends it to the remote object that is represented by the current instance of RealProxy.

The IMessage parameter provides a dictionary through the IMessage.Properties property. The dictionary contains name/value pairs of information about the method call, such as the name of the method called and its parameters.

Applies to

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