Silverlight communication with XML RPC console server

Question

I want to comunicate with Console XML RPC server from my silvelight application. Is it possibile?

Steps: 1. Start the Console XML RPC server

Code for Console XML RPC server is this:

using System;
using System.Collections;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;

using CookComputing.XmlRpc;

public class StateNameServer : MarshalByRefObject, IStateName
{
  public string GetStateName(int stateNumber)
  {
    return "whatever";
  }

}

class _
{
  static void Main(string[] args)
  {
    IDictionary props = new Hashtable();
    props["name"] = "MyHttpChannel";
    props["port"] = 5678;
    HttpChannel channel = new HttpChannel(props,null,new XmlRpcServerFormatterSinkProvider());
    ChannelServices.RegisterChannel(channel,false);

    RemotingConfiguration.RegisterWellKnownServiceType(
      typeof(StateNameServer),"statename.rem",WellKnownObjectMode.Singleton);
    Console.WriteLine("Press <ENTER> to shutdown");
    Console.ReadLine();
  }
}

1. Run Silverlight application I used the code from http://code.google.com/p/xmlrpc-silverlight/ I created new Silverlight application to which I have attached the code from that link. When I start web site (in localhost with port 1139) which executes my SL app happens SecurityException.

   void ResponseResponse(IAsyncResult result)
   {
       XmlRpcHelperRequestState state = result.AsyncState as XmlRpcHelperRequestState;
       try
       {
        state.Response = (HttpWebResponse)state.Request.EndGetResponse(result);
        ... 
       }
       catch (Exception e)
       {
        // comes here with SecurityException
      }
       finally
       {
        ...
       }
   }
   

I am using VS2008 Professional,XP Professional, .net 3.5, Silverlight3. I will gladly provide any additional information (or code) which is needed.

Answer 1

I suspect that this is a case of a missing clientaccesspolicy.xml file.

Since your silverlight app will have been launched from another authority it will attempt to access this file the http://localhost:5678/. Since you little test doesn't support that file Silverlight blocks this cross "domain" activity.