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Value cannot be null. Parameter name: type in .NET remoting

Posted on 2010-09-12
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1,008 Views
Last Modified: 2012-05-10
I have added the following sample code from Microsoft website:

Server Code

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

namespace RemoteServer
{
    class Program
    {
        static void Main(string[] args)
        {
            TcpChannel chan = new TcpChannel(8085);
            ChannelServices.RegisterChannel(chan, false);
            RemotingConfiguration.RegisterWellKnownServiceType(Type.GetType("RemoteObject.HelloServer,object"), "SayHello", WellKnownObjectMode.SingleCall);
            //RemotingConfiguration.RegisterWellKnownServiceType(Type.GetType("RemotableOPCObject.RemotableOPCObject, RemotableOPCObject"), "RemoteTcpTest", WellKnownObjectMode.SingleCall);
            System.Console.WriteLine("Hit <enter> to exit...");
            System.Console.ReadLine();
        }
    }
}

Object Code

using System;
using System.Collections.Generic;
using System.Text;

namespace RemoteObject
{
    public class HelloServer : MarshalByRefObject
    {
        public HelloServer()
        {
            Console.WriteLine("HelloServer activated");
        }

        public String HelloMethod(String name)
        {
            Console.WriteLine("Hello.HelloMethod : {0}", name);
            return "Hi there " + name;
        }
    }
}

Client Code

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

namespace RemoteClient
{
    class Program
    {
        static void Main(string[] args)
        {
            //TcpChannel chan = new TcpChannel();
            //ChannelServices.RegisterChannel(chan, false);
            RemoteObject.HelloServer obj = (RemoteObject.HelloServer)Activator.GetObject(typeof(RemoteObject.HelloServer), "tcp://localhost:8085/SayHello");
            //RemotableOPCObject.RemotableOPCObject obj = (RemotableOPCObject.RemotableOPCObject)Activator.GetObject(typeof(RemotableOPCObject.RemotableOPCObject), "tcp://localhost:8085/RemoteTest");
            if (obj == null)
                System.Console.WriteLine("Could not locate server");
            else
                //Console.WriteLine(obj.ReturnHelloMessage());
                Console.WriteLine(obj.HelloMethod("Caveman"));
        }
    }
}


When I try to run the server, it throws the following Exception at the following line......
            RemotingConfiguration.RegisterWellKnownServiceType(Type.GetType("RemoteObject.HelloServer,object"), "SayHello", WellKnownObjectMode.SingleCall);

I have attached the exception image below.

I can't figure out what's going on? If you have any idea, please share....Thanks
1.bmp
0
Comment
Question by:YetAnotherCoder
  • 2
4 Comments
 
LVL 65

Accepted Solution

by:
rockiroads earned 2000 total points
ID: 33659201
whats the difference between using Type.GetType and typeof

if u tried typeof does that make a difference?

 RemotingConfiguration.RegisterWellKnownServiceType(typeof("RemoteObject.HelloServer,object"), "SayHello", WellKnownObjectMode.SingleCall);

I think the main difference between the two might be one requires an instance
0
 
LVL 14

Expert Comment

by:existenz2
ID: 33659985
It should be the following, without the ",object"

Also what rockiroads says is true, it's better to use typeof(), that saves you typing a string (and making mistakes in the naming).
RemotingConfiguration.RegisterWellKnownServiceType(Type.GetType("RemoteObject.HelloServer"), "SayHello", WellKnownObjectMode.SingleCall);

Open in new window

0
 

Author Comment

by:YetAnotherCoder
ID: 33668242
Actually I figured out the solution right after I posted but didn't update quickly. The solution is to use typeof(namespace.classname). BUT it has worked in the past with Type.GetType("Namespace.ClassName, Namespace.ClassName). I don't know what made this not to work anymore all of a sudden. But thanks to rockiroads.......
0
 
LVL 65

Expert Comment

by:rockiroads
ID: 33668297
probably what not made it work was it couldnt find an instance, thats about the one major difference I found between the two.
still you cracked it so thats the main thing and thanks for the points :)
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