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BaseChannelSinkWithProperties Class

Provides a base implementation for channel sinks that want to expose a dictionary interface to their properties.

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

[ComVisibleAttribute(true)]
[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.Infrastructure)]
[SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags = SecurityPermissionFlag.Infrastructure)]
public abstract class BaseChannelSinkWithProperties : BaseChannelObjectWithProperties

Channel sinks provide a plug-in point that allows access to the underlying messages that are flowing through the channel as well as the stream that is used by the transport mechanism to send messages to a remote object. Channel sinks are linked together in a chain of channel sink providers, and all channel messages flow through this chain of sinks before the message is serialized and transported.

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 BaseChannelSinkWithProperties, you must implement the Keys property and the Item property.

[SecurityPermission(SecurityAction.Demand, Flags = SecurityPermissionFlag.Infrastructure)]
internal class MyClientFormatterChannelSink :
         BaseChannelSinkWithProperties, IClientChannelSink, IMessageSink
{
   private IClientChannelSink nextClientSink=null;
   private IMessageSink nextMessageSink = null;

   public MyClientFormatterChannelSink(IClientChannelSink nextSink,
                                       IMessageSink nextMsgSink) : base()
   {
      nextClientSink = nextSink;
      nextMessageSink = nextMsgSink;
   }

   public void ProcessMessage(IMessage msg,
         ITransportHeaders requestHeaders, Stream requestStream,
         out ITransportHeaders responseHeaders, out Stream responseStream)
   {
      nextClientSink.ProcessMessage(msg, requestHeaders, requestStream,
               out responseHeaders, out responseStream);
   }

   public void AsyncProcessRequest(IClientChannelSinkStack sinkStack,
                  IMessage msg, ITransportHeaders headers, Stream myStream)
   {
      sinkStack.Push(this, null);
      nextClientSink.AsyncProcessRequest(sinkStack,msg,headers,myStream);
   }

   public void AsyncProcessResponse(IClientResponseChannelSinkStack sinkStack,
         Object state, ITransportHeaders headers, Stream myStream)
   {
      sinkStack.AsyncProcessResponse(headers, myStream);
   }

   public Stream GetRequestStream(IMessage msg,ITransportHeaders headers)
   {
      return null;
   }

   public IClientChannelSink NextChannelSink
   {
      get
      {
         return nextClientSink;
      }
   }

   public IMessageSink NextSink
   {
      get
      {
         return nextMessageSink;
      }
   }

   public IMessageCtrl AsyncProcessMessage(IMessage msg,
                                                IMessageSink replySink)
   {
      return null;
   }

   public IMessage SyncProcessMessage(IMessage msg)
   {
      return nextMessageSink.SyncProcessMessage(msg);
   }

   public override Object this[Object key]
   {
      get
      {
         if (key == typeof(MyKey))
            return this;
         return null;
      }
      set
      {
         throw new NotSupportedException();
      }
   }
   public override ICollection Keys
   {
      get
      {
         ArrayList myKeys = new ArrayList(1);
         myKeys.Add(typeof(MyKey));
         return myKeys;
      }
   }
}
public class MyKey
{
}
public __gc class MyKey
{
};

private __gc class MyClientFormatterChannelSink :
    public BaseChannelSinkWithProperties, public IClientChannelSink, public IMessageSink
{
private:
    IClientChannelSink* nextClientSink;
    IMessageSink* nextMessageSink;

public:
    MyClientFormatterChannelSink() : nextClientSink(0), nextMessageSink(0) {}

    MyClientFormatterChannelSink(IClientChannelSink* nextSink,
        IMessageSink* nextMsgSink) : BaseChannelSinkWithProperties()
    {
        nextClientSink = nextSink;
        nextMessageSink = nextMsgSink;
    }

    void ProcessMessage(IMessage* msg,
        ITransportHeaders* requestHeaders, Stream* requestStream,
        [Out]ITransportHeaders** responseHeaders, [Out]Stream** responseStream)
    {
        nextClientSink->ProcessMessage(msg, requestHeaders, requestStream,
            responseHeaders, responseStream);
    }

    void AsyncProcessRequest(IClientChannelSinkStack* sinkStack,
        IMessage* msg, ITransportHeaders* headers, Stream* myStream)
    {
        sinkStack->Push(this, 0);
        nextClientSink->AsyncProcessRequest(sinkStack,msg,headers,myStream);
    }

    void AsyncProcessResponse(IClientResponseChannelSinkStack* sinkStack,
        Object* /*state*/, ITransportHeaders* headers, Stream* myStream)
    {
        sinkStack->AsyncProcessResponse(headers, myStream);
    }

    Stream* GetRequestStream(IMessage* /*msg*/,ITransportHeaders* /*headers*/)
    {
        return 0;
    }

    __property IClientChannelSink* get_NextChannelSink()
    {
        return nextClientSink;
    }

    __property IMessageSink* get_NextSink()
    {
        return nextMessageSink;
    }

    IMessageCtrl* AsyncProcessMessage(IMessage* /*msg*/,
        IMessageSink* /*replySink*/)
    {
        return 0;
    }

    IMessage* SyncProcessMessage(IMessage* msg)
    {
        return nextMessageSink->SyncProcessMessage(msg);
    }

    __property Object* get_Item( Object* key )
    {
        if (key == __typeof(MyKey))
            return this;
        return 0;
    }

    __property void set_Item( Object* /*value*/, Object* /*key*/ )
    {
        throw new NotSupportedException();
    }

    __property ICollection* get_Keys()
    {
        ArrayList* myKeys = new ArrayList(1);
        myKeys->Add(__typeof(MyKey));
        return myKeys;
    }

};

public __gc class MyClientFormatterProvider : public IClientChannelSinkProvider
{
private:
    IClientChannelSinkProvider* nextProvider;
public:
    MyClientFormatterProvider() : nextProvider(0)
    {
    }

    IClientChannelSink* CreateSink(IChannelSender* channel,
        String* myUrl, Object* remoteChannelData)
    {
        IClientChannelSink* nextSink = 0;
        IMessageSink* nextMsgSink = 0;
        if (nextProvider!=0)
        {
            Console::WriteLine(S"Next client sink provider is: {0}", nextProvider);
            // Create a sink chain calling the next sink provider's
            // 'CreateSink' method.
            nextSink=nextProvider->CreateSink(channel,myUrl,remoteChannelData);
            nextMsgSink=dynamic_cast<IMessageSink*>(nextSink);
        }
        return new MyClientFormatterChannelSink(nextSink,nextMsgSink);
    }

    __property IClientChannelSinkProvider* get_Next()
    {
        return nextProvider;
    }

    __property void set_Next( IClientChannelSinkProvider* value )
    {
        nextProvider = value;
    }

};

System.Object
  System.Runtime.Remoting.Channels.BaseChannelObjectWithProperties
    System.Runtime.Remoting.Channels.BaseChannelSinkWithProperties

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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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