[PSerializable]
    public class LoggingAspect : OnMethodBoundaryAspect
    {

        public override void OnEntry(MethodExecutionArgs args)
        {
            Console.WriteLine("The {0} method has been entered.", args.Method.Name);
        }

        public override void OnSuccess(MethodExecutionArgs args)
        {
            Console.WriteLine("The {0} method executed successfully.", args.Method.Name);
        }

        public override void OnExit(MethodExecutionArgs args)
        {
            Console.WriteLine("The {0} method has exited.", args.Method.Name);
        }

        public override void OnException(MethodExecutionArgs args)
        {
            
            Console.WriteLine("An exception was thrown in {0}.", args.Method.Name);
            args.FlowBehavior = FlowBehavior.Continue;

        }

    }

    /// <summary>
    /// 目前记录了方法的执行时间，输出样例：
    /// [2016-04-12 10:39:36]方法 GetUser 执行结束，用时 164ms
    /// </summary>
    [Serializable]
    public class LogsAttribute : OnMethodBoundaryAspect, IInstanceScopedAspect
    {
        [NonSerialized]
        private Stopwatch _stopwatch;

        public object CreateInstance(AdviceArgs adviceArgs)
        {
            return MemberwiseClone();
        }

        public override void OnEntry(MethodExecutionArgs eventArgs)
        {
            _stopwatch.Restart();
            Arguments arguments = eventArgs.Arguments;
            StringBuilder sb = new StringBuilder();
            ParameterInfo[] parameters = eventArgs.Method.GetParameters();
            for (int i = 0; arguments != null && i < arguments.Count; i++)
            {
                //进入的参数的值
                sb.Append(parameters[i].Name + "=" + arguments[i] + "");
            }
            LoggerHelper.Writelog("方法 " + eventArgs.Method.Name + " 开始执行，参数为：" + sb);

        }

        public override void OnSuccess(MethodExecutionArgs args)
        {
            _stopwatch.Stop();
            LoggerHelper.Writelog(
                "方法 " + args.Method.Name + " 执行结束，用时 " + _stopwatch.ElapsedMilliseconds + "ms",
                LogLevel.Success
            );
        }

        public override void OnException(MethodExecutionArgs args)
        {
            _stopwatch.Stop();
            LoggerHelper.Writelog(
                "方法 " + args.Method.Name + " 执行出错，错误为：" + args.Exception,
                LogLevel.Error
            );
            args.FlowBehavior = FlowBehavior.Continue;
        }

        /// <summary>
        /// 初始化类必须的方法
        /// </summary>
        public void RuntimeInitializeInstance()
        {
            _stopwatch = new Stopwatch();
        }
    }


    public static class LoggerHelper
    {
        public static void Writelog(string err, LogLevel lvl=LogLevel.Success)
        {
            System.Diagnostics.Debug.Print(err);
        }
    }

    public enum LogLevel
    {
        Debug,
        Info,
        Waring,
        Error,
        Success
    }

        [Logs]
        public void Test()
        {
            string s="";
            for (int i = 0; i < 5000; i++)
            {
                s += i.ToString();
            }
            //测试异常
            object o = null;
            System.Diagnostics.Debug.Print(o.GetType().FullName);
            System.Diagnostics.Debug.Print(s);
        }

方法 Test 开始执行，参数为：
“PostSharpApp2.exe”(CLR v4.0.30319: PostSharpApp2.exe): 已加载“C:\Windows\Microsoft.Net\assembly\GAC_MSIL\mscorlib.resources\v4.0_4.0.0.0_zh-Hans_b77a5c561934e089\mscorlib.resources.dll”。模块已生成，不包含符号。
引发的异常:“System.NullReferenceException”(位于 PostSharpApp2.exe 中)
方法 Test 执行出错，错误为：System.NullReferenceException: 未将对象引用设置到对象的实例。
   在 PostSharpApp2.Form1.Test() 位置 F:\Visual Studio 2017\Source\WindowsFormsApp1\PostSharpApp2\Form1.cs:行号 48