IMessage Interface

Definição

Espaço de Nomes:: System.Runtime.Remoting.Messaging

Assemblagem:: mscorlib.dll

Importante

Algumas informações dizem respeito a um produto pré-lançado que pode ser substancialmente modificado antes de ser lançado. A Microsoft não faz garantias, de forma expressa ou implícita, em relação à informação aqui apresentada.

Contém dados de comunicação enviados entre sumidoiros de mensagens cooperantes.

public interface class IMessage

public interface IMessage

[System.Runtime.InteropServices.ComVisible(true)]
public interface IMessage

type IMessage = interface

[<System.Runtime.InteropServices.ComVisible(true)>]
type IMessage = interface

Public Interface IMessage

Derivado: System.Runtime.Remoting.Activation.IConstructionCallMessage

System.Runtime.Remoting.Activation.IConstructionReturnMessage

System.Runtime.Remoting.Messaging.ConstructionCall

System.Runtime.Remoting.Messaging.ConstructionResponse

System.Runtime.Remoting.Messaging.IMethodCallMessage

Mais…

Atributos: ComVisibleAttribute

Exemplos

// Create a custom 'RealProxy'.
public ref class MyProxy: public RealProxy
{
private:
   String^ myURIString;
   MarshalByRefObject^ myMarshalByRefObject;

public:
   MyProxy( Type^ myType )
      : RealProxy( myType )
   {
      
      // RealProxy uses the Type to generate a transparent proxy.
      myMarshalByRefObject = dynamic_cast<MarshalByRefObject^>(Activator::CreateInstance(myType));
      
      // Get 'ObjRef', for transmission serialization between application domains.
      ObjRef^ myObjRef = RemotingServices::Marshal( myMarshalByRefObject );
      
      // Get the 'URI' property of 'ObjRef' and store it.
      myURIString = myObjRef->URI;
      Console::WriteLine( "URI :{0}", myObjRef->URI );
   }

   virtual IMessage^ Invoke ( IMessage^ myIMessage ) override 
    {
      Console::WriteLine( "MyProxy.Invoke Start" );
      Console::WriteLine( "" );
      if ( dynamic_cast<IMethodCallMessage^>(myIMessage) )
            Console::WriteLine( "IMethodCallMessage" );

      if ( dynamic_cast<IMethodReturnMessage^>(myIMessage) )
            Console::WriteLine( "IMethodReturnMessage" );

      Type^ msgType = myIMessage->GetType();
      Console::WriteLine( "Message Type: {0}", msgType );
      Console::WriteLine( "Message Properties" );
      IDictionary^ myIDictionary = myIMessage->Properties;
      
      // Set the '__Uri' property of 'IMessage' to 'URI' property of 'ObjRef'.
      myIDictionary->default[ "__Uri" ] = myURIString;
      IDictionaryEnumerator^ myIDictionaryEnumerator = dynamic_cast<IDictionaryEnumerator^>(myIDictionary->GetEnumerator());
      while ( myIDictionaryEnumerator->MoveNext() )
      {
         Object^ myKey = myIDictionaryEnumerator->Key;
         String^ myKeyName = myKey->ToString();
         Object^ myValue = myIDictionaryEnumerator->Value;
         Console::WriteLine( "\t{0} : {1}", myKeyName, myIDictionaryEnumerator->Value );
         if ( myKeyName->Equals( "__Args" ) )
         {
            array<Object^>^myObjectArray = (array<Object^>^)myValue;
            for ( int aIndex = 0; aIndex < myObjectArray->Length; aIndex++ )
               Console::WriteLine( "\t\targ: {0} myValue: {1}", aIndex, myObjectArray[ aIndex ] );
         }

         if ( (myKeyName->Equals( "__MethodSignature" )) && (nullptr != myValue) )
         {
            array<Object^>^myObjectArray = (array<Object^>^)myValue;
            for ( int aIndex = 0; aIndex < myObjectArray->Length; aIndex++ )
               Console::WriteLine( "\t\targ: {0} myValue: {1}", aIndex, myObjectArray[ aIndex ] );
         }
      }

      IMessage^ myReturnMessage;
      myIDictionary->default[ "__Uri" ] = myURIString;
      Console::WriteLine( "__Uri {0}", myIDictionary->default[ "__Uri" ] );
      Console::WriteLine( "ChannelServices.SyncDispatchMessage" );
      myReturnMessage = ChannelServices::SyncDispatchMessage( myIMessage );
      
      // Push return value and OUT parameters back onto stack.
      IMethodReturnMessage^ myMethodReturnMessage = dynamic_cast<IMethodReturnMessage^>(myReturnMessage);
      Console::WriteLine( "IMethodReturnMessage.ReturnValue: {0}", myMethodReturnMessage->ReturnValue );
      Console::WriteLine( "MyProxy.Invoke - Finish" );
      return myReturnMessage;
   }
};

// Create a custom 'RealProxy'.
public class MyProxy : RealProxy
{
   String myURIString;
   MarshalByRefObject myMarshalByRefObject;

   public MyProxy(Type myType) : base(myType)
   {
      // RealProxy uses the Type to generate a transparent proxy.
      myMarshalByRefObject = (MarshalByRefObject)Activator.CreateInstance((myType));
      // Get 'ObjRef', for transmission serialization between application domains.
      ObjRef myObjRef = RemotingServices.Marshal(myMarshalByRefObject);
      // Get the 'URI' property of 'ObjRef' and store it.
      myURIString = myObjRef.URI;
      Console.WriteLine("URI :{0}", myObjRef.URI);
   }

   public override IMessage Invoke(IMessage myIMessage)
   {
      Console.WriteLine("MyProxy.Invoke Start");
      Console.WriteLine("");

      if (myIMessage is IMethodCallMessage)
         Console.WriteLine("IMethodCallMessage");

      if (myIMessage is IMethodReturnMessage)
         Console.WriteLine("IMethodReturnMessage");

      Type msgType = myIMessage.GetType();
      Console.WriteLine("Message Type: {0}", msgType.ToString());
      Console.WriteLine("Message Properties");
      IDictionary myIDictionary = myIMessage.Properties;
      // Set the '__Uri' property of 'IMessage' to 'URI' property of 'ObjRef'.
      myIDictionary["__Uri"] = myURIString;
      IDictionaryEnumerator myIDictionaryEnumerator =
         (IDictionaryEnumerator) myIDictionary.GetEnumerator();

      while (myIDictionaryEnumerator.MoveNext())
      {
         Object myKey = myIDictionaryEnumerator.Key;
         String myKeyName = myKey.ToString();
         Object myValue = myIDictionaryEnumerator.Value;

         Console.WriteLine("\t{0} : {1}", myKeyName,
            myIDictionaryEnumerator.Value);
         if (myKeyName == "__Args")
         {
            Object[] myObjectArray = (Object[])myValue;
            for (int aIndex = 0; aIndex < myObjectArray.Length; aIndex++)
               Console.WriteLine("\t\targ: {0} myValue: {1}", aIndex,
                  myObjectArray[aIndex]);
         }

         if ((myKeyName == "__MethodSignature") && (null != myValue))
         {
            Object[] myObjectArray = (Object[])myValue;
            for (int aIndex = 0; aIndex < myObjectArray.Length; aIndex++)
               Console.WriteLine("\t\targ: {0} myValue: {1}", aIndex,
                  myObjectArray[aIndex]);
         }
      }

      IMessage myReturnMessage;

      myIDictionary["__Uri"] = myURIString;
      Console.WriteLine("__Uri {0}", myIDictionary["__Uri"]);

      Console.WriteLine("ChannelServices.SyncDispatchMessage");
      myReturnMessage = ChannelServices.SyncDispatchMessage(myIMessage);

      // Push return value and OUT parameters back onto stack.

      IMethodReturnMessage myMethodReturnMessage = (IMethodReturnMessage)
         myReturnMessage;
      Console.WriteLine("IMethodReturnMessage.ReturnValue: {0}",
         myMethodReturnMessage.ReturnValue);

      Console.WriteLine("MyProxy.Invoke - Finish");

      return myReturnMessage;
   }
}

' Create a custom 'RealProxy'.
Public Class MyProxy
   Inherits RealProxy
   Private myURIString As String
   Private myMarshalByRefObject As MarshalByRefObject

   <PermissionSet(SecurityAction.LinkDemand)> _
   Public Sub New(ByVal myType As Type)
      MyBase.New(myType)
      ' RealProxy uses the Type to generate a transparent proxy.
      myMarshalByRefObject = CType(Activator.CreateInstance(myType), MarshalByRefObject)
      ' Get 'ObjRef', for transmission serialization between application domains.
      Dim myObjRef As ObjRef = RemotingServices.Marshal(myMarshalByRefObject)
      ' Get the 'URI' property of 'ObjRef' and store it.
      myURIString = myObjRef.URI
      Console.WriteLine("URI :{0}", myObjRef.URI)
   End Sub

<SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags:=SecurityPermissionFlag.Infrastructure)> _
   Public Overrides Function Invoke(ByVal myIMessage As IMessage) As IMessage
      Console.WriteLine("MyProxy.Invoke Start")
      Console.WriteLine("")

      If TypeOf myIMessage Is IMethodCallMessage Then
         Console.WriteLine("IMethodCallMessage")
      End If
      If TypeOf myIMessage Is IMethodReturnMessage Then
         Console.WriteLine("IMethodReturnMessage")
      End If
      Dim msgType As Type
      msgType = CObj(myIMessage).GetType
      Console.WriteLine("Message Type: {0}", msgType.ToString())
      Console.WriteLine("Message Properties")
      Dim myIDictionary As IDictionary = myIMessage.Properties
      ' Set the '__Uri' property of 'IMessage' to 'URI' property of 'ObjRef'.
      myIDictionary("__Uri") = myURIString
      Dim myIDictionaryEnumerator As IDictionaryEnumerator = CType(myIDictionary.GetEnumerator(), _
                                                                    IDictionaryEnumerator)

      While myIDictionaryEnumerator.MoveNext()
         Dim myKey As Object = myIDictionaryEnumerator.Key
         Dim myKeyName As String = myKey.ToString()
         Dim myValue As Object = myIDictionaryEnumerator.Value

         Console.WriteLine(ControlChars.Tab + "{0} : {1}", myKeyName, myIDictionaryEnumerator.Value)
         If myKeyName = "__Args" Then
            Dim myObjectArray As Object() = CType(myValue, Object())
            Dim aIndex As Integer
            For aIndex = 0 To myObjectArray.Length - 1
               Console.WriteLine(ControlChars.Tab + ControlChars.Tab + "arg: {0} myValue: {1}", _
                                                              aIndex, myObjectArray(aIndex))
             Next aIndex
         End If

         If myKeyName = "__MethodSignature" And Not Nothing Is myValue Then
            Dim myObjectArray As Object() = CType(myValue, Object())
            Dim aIndex As Integer
            For aIndex = 0 To myObjectArray.Length - 1
               Console.WriteLine(ControlChars.Tab + ControlChars.Tab + "arg: {0} myValue: {1}", _
                                                           aIndex, myObjectArray(aIndex))
            Next aIndex
         End If
      End While

        Dim myReturnMessage As IMessage

        myIDictionary("__Uri") = myURIString
        Console.WriteLine("__Uri {0}", myIDictionary("__Uri"))

        Console.WriteLine("ChannelServices.SyncDispatchMessage")
        myReturnMessage = ChannelServices.SyncDispatchMessage(CObj(myIMessage))

        ' Push return value and OUT parameters back onto stack.
        Dim myMethodReturnMessage As IMethodReturnMessage = CType(myReturnMessage, IMethodReturnMessage)
        Console.WriteLine("IMethodReturnMessage.ReturnValue: {0}", myMethodReturnMessage.ReturnValue)

        Console.WriteLine("MyProxy.Invoke - Finish")

        Return myReturnMessage
    End Function 'Invoke
End Class

Observações

Os sinks de mensagens que usam IMessage podem ser colocados nas cadeias de sink do cliente ou nas cadeias de sink do servidor. Um objeto de mensagem é passado de sumidouro de mensagens para sumidouro de mensagens através da cadeia, e transporta um conjunto de propriedades nomeadas, como identificadores de ação, informação de enviado e parâmetros.

Um objeto que implementa a IMessage interface cumpre os requisitos mínimos para ser considerado um objeto mensagem. O objeto exato recebido por um sumidouro de mensagens não tem de ser passado para o sumidouro seguinte, mas isso é frequentemente o caso.

Embora os objetos no saco de propriedades não tenham de ser serializáveis, o implementador do dissipador de mensagens precisa de considerar isto, uma vez que as propriedades que saem do domínio da aplicação devem ser serializáveis.

Propriedades

Name	Description
Properties	Obtém um IDictionary que representa uma coleção das propriedades da mensagem.

Aplica-se a

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