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;
}

}
}

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);
MessageBox.Show("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);
}
MessageBox.Show(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";
}

}
}