C# AOP实现

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;
        }       

    }
}

AopProxy.cs

    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;
                }
            }
        }
    }

AopAttribute.cs

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

    namespace Aop
    {
        [AopAttribute]
        public class AopClass : ContextBoundObject
        {
            public string Hello()
            {
                return "welcome";
            }  

        }
    }

AopClass.cs