C#的AOP
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);
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;
}
}
}
}
AopAttribute.cs
using System.Collections.Generic;
using System.Text;
namespace Aop
{
[AopAttribute]
public class AopClass : ContextBoundObject
{
public string Hello()
{
return "welcome";
}
}
}
-----
重点就是这里拦截之后的代码，稍为复杂点，一般照抄就行了，拦截的代码如下：
if (msg is IConstructionCallMessage) // 如果是构造函数，按原来的方式返回即可。
{
IConstructionCallMessage constructCallMsg = msg as IConstructionCallMessage;
IConstructionReturnMessage constructionReturnMessage = this.InitializeServerObject((IConstructionCallMessage)msg);
RealProxy.SetStubData(this, constructionReturnMessage.ReturnValue);
return constructionReturnMessage;
}
else if (msg is IMethodCallMessage) //如果是方法调用（属性也是方法调用的一种）
{
IMethodCallMessage callMsg = msg as IMethodCallMessage;
object[] args = callMsg.Args;
IMessage message;
try
{
if (callMsg.MethodName.StartsWith("set_") && args.Length == 1)
{
//这里检测到是set方法，然后应怎么调用对象的其它方法呢？
}
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);
}
return message;
}
return msg;
OK , 具体
1 , 应用 在要拦截的类头上加个属性标识，同时继承自ContextBoundObject：
[AopAttribute] public class OrmBase:ContextBoundObject
PS : OrmBase需要拦截
2 , AopAttribute继承代理属性标识类，用来挂在要拦截的类的头上：
class AopAttribute : ProxyAttribute
{
public override MarshalByRefObject CreateInstance(Type serverType)
{
AopProxy realProxy = new AopProxy(serverType);
return realProxy.GetTransparentProxy() as MarshalByRefObject;
}
}
3 , AopProxy类，就是拦截的消息处理，先上个简单版，免的大伙看不懂：
class AopProxy : RealProxy
{
public AopProxy(Type serverType)
: base(serverType)
{
}
public override IMessage Invoke(IMessage msg)
{
//消息拦截之后，就会执行这里的方法。
// 上面有拦截代码
}
}
原文 : http://blog.csdn.net/problc/article/details/4152082
http://www.cnblogs.com/cyq1162/archive/2012/05/30/2526573.html