日志AOP的实现

     /// <summary>
     /// 日志AOP拦截
     /// </summary>
     [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
     public class LogInterceptorAttribute : ContextAttribute, IContributeObjectSink
     {
         public LogInterceptorAttribute()
             : base("LogInterceptor")
         { }

         /// <summary>
         /// 实现IContributeObjectSink接口当中的消息接收器接口
         /// </summary>
         /// <param name="obj"></param>
         /// <param name="next"></param>
         /// <returns></returns>
         public IMessageSink GetObjectSink(MarshalByRefObject obj, IMessageSink next)
         {
             return new LogInterceptorHandler(next);
         }
     }
     /// <summary>
     /// 日志拦截操作
     /// </summary>
     public sealed class LogInterceptorHandler : IMessageSink
     {
         //下一个接收器
         private IMessageSink nextSink;
         public IMessageSink NextSink
         {
             get { return nextSink; }
         }
         public LogInterceptorHandler(IMessageSink nextSink)
         {
             this.nextSink = nextSink;
         }

         public IMessage SyncProcessMessage(IMessage msg)
         {
             OnActionExecuted(msg);
             var retMsg = nextSink.SyncProcessMessage(msg);
             OnActionExecuting(retMsg);
             return retMsg;
         }
         public IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink)
         {
             return null;
         }

         /// <summary>
         /// 方法执行前
         /// </summary>
         /// <param name="msg"></param>
         private void OnActionExecuted(IMessage msg)
         {

         }

         /// <summary>
         /// 方法执行后
         /// </summary>
         /// <param name="msg"></param>
         private void OnActionExecuting(IMessage msg)
         {

         }
     }