using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.Remoting.Proxies;

namespace Aop

{

    public class AopAttribute : ProxyAttribute

    {

        public override MarshalByRefObject CreateInstance(Type serverType)

        {

            AopProxy realProxy = new AopProxy(serverType);

            return realProxy.GetTransparentProxy() as MarshalByRefObject;

        }       

    }

}

    using System;

    using System.Collections.Generic;

    using System.Text;

    using System.Reflection.Emit;

    using System.Runtime.Remoting.Proxies;

    using System.Runtime.Remoting.Messaging;

    using System.Runtime.Remoting.Activation;

    using System.Windows.Forms;  

    namespace Aop

    {

        public class AopProxy : RealProxy

        {

            public AopProxy(Type serverType)

                : base(serverType) { }  

            public override IMessage Invoke(IMessage msg)

            {

                if (msg is IConstructionCallMessage)

                {

                    IConstructionCallMessage constructCallMsg = msg as IConstructionCallMessage;

                    IConstructionReturnMessage constructionReturnMessage = this.InitializeServerObject((IConstructionCallMessage)msg);

                    RealProxy.SetStubData(this, constructionReturnMessage.ReturnValue);

                    Console.WriteLine("Call constructor");

                    return constructionReturnMessage;

                }

                else

                {

                    IMethodCallMessage callMsg = msg as IMethodCallMessage;

                    IMessage message;

                    try

                    {

                        object[] args = callMsg.Args;

                        object o = callMsg.MethodBase.Invoke(GetUnwrappedServer(), args);

                        message = new ReturnMessage(o, args, args.Length, callMsg.LogicalCallContext, callMsg);

                    }

                    catch (Exception e)

                    {

                        message = new ReturnMessage(e, callMsg);

                    }

                    Console.WriteLine(message.Properties["__Return"].ToString());

                    return message;

                }

            }

        }

    }

    using System;

    using System.Collections.Generic;

    using System.Text;  

    namespace Aop

    {

        [AopAttribute]

        public class AopClass : ContextBoundObject

        {

            public string Hello()

            {

                return "welcome";

            }  

        }

    }