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)
        {

        }
    }