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RealProxy Class

Provides base functionality for proxies.

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

[ComVisibleAttribute(true)] 
public abstract class RealProxy
/** @attribute ComVisibleAttribute(true) */ 
public abstract class RealProxy
ComVisibleAttribute(true) 
public abstract class RealProxy

The RealProxy class is the abstract base class from which proxies must derive.

A client that uses an object across any kind of a remoting boundary is actually using a transparent proxy for the object. The transparent proxy provides the illusion that the actual object resides in the client's space. It achieves this by forwarding calls made on it to the real object using the remoting infrastructure.

The transparent proxy is itself housed by an instance of a managed runtime class of type RealProxy. The RealProxy implements a part of the functionality that is needed to forward the operations from the transparent proxy. Note that a proxy object inherits the associated semantics of managed objects such as garbage collection, support for fields and methods, and can be extended to form new classes. The proxy has a dual nature: it acts as an object of the same class as the remote object (transparent proxy), and it is a managed object itself.

A proxy object can be used without regard to any remoting subdivisions within a AppDomain.

NoteNote

This class makes a link demand and an inheritance demand at the class level. A SecurityException is thrown when either the immediate caller or the derived class does not have infrastructure permission. For details about security demands, see Link Demands and Inheritance Demands.

Notes to Inheritors When you inherit from RealProxy, you must override the Invoke method.

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

   [PermissionSet(SecurityAction.LinkDemand)]
   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);
   }

   [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]
   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'.
/** @attribute SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.Infrastructure) */
public class MyProxy extends RealProxy
{
    private String myURIString;
    private MarshalByRefObject myMarshalByRefObject;

    public MyProxy(Type myType)
    {
        super(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.get_URI();
        Console.WriteLine("URI :{0}", myObjRef.get_URI());
    } //MyProxy

    public IMessage Invoke(IMessage myIMessage)
    {
        Console.WriteLine("MyProxy.Invoke Start");
        Console.WriteLine("");
        if (myIMessage instanceof IMethodCallMessage) {
            Console.WriteLine("IMethodCallMessage");
        }

        if (myIMessage instanceof IMethodReturnMessage) {
            Console.WriteLine("IMethodReturnMessage");
        }

        Type msgType = myIMessage.GetType();

        Console.WriteLine("Message Type: {0}", msgType.ToString());
        Console.WriteLine("Message Properties");

        IDictionary myIDictionary = myIMessage.get_Properties();

        // Set the '__Uri' property of 'IMessage' to 'URI' property of 'ObjRef'.
        myIDictionary.set_Item("__Uri", myURIString);

        IDictionaryEnumerator myIDictionaryEnumerator = 
            (IDictionaryEnumerator)(myIDictionary.GetEnumerator());
        while (myIDictionaryEnumerator.MoveNext()) {
            Object myKey = myIDictionaryEnumerator.get_Key();
            String myKeyName = myKey.ToString();
            Object myValue = myIDictionaryEnumerator.get_Value();
            Console.WriteLine("\t{0} : {1}", myKeyName, 
                myIDictionaryEnumerator.get_Value());

            if (myKeyName.Equals("__Args")) {
                Object myObjectArray[] = (Object[])myValue;
                for (int aIndex = 0; aIndex < myObjectArray.length; aIndex++) {
                    Console.WriteLine("\t\targ: {0} myValue: {1}", 
                        (Int32)aIndex, myObjectArray.get_Item(aIndex));
                }
            }

            if (myKeyName.Equals("__MethodSignature") && null != myValue) {
                Object myObjectArray[] = (Object[])myValue;
                for (int aIndex = 0; aIndex < myObjectArray.length; aIndex++) {
                    Console.WriteLine("\t\targ: {0} myValue: {1}", 
                        (Int32)aIndex, myObjectArray.get_Item(aIndex));
                }
            }
        }

        IMessage myReturnMessage;
        myIDictionary.set_Item("__Uri", myURIString);
        Console.WriteLine("__Uri {0}", myIDictionary.get_Item("__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.get_ReturnValue());
        Console.WriteLine("MyProxy.Invoke - Finish");
        return myReturnMessage;
    } //Invoke
} //MyProxy

System.Object
  System.Runtime.Remoting.Proxies.RealProxy

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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