C#代码执行耗时计算，此处是监测的mvc控制器方法

using System;
using System.Diagnostics;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using System.Web.Http.Controllers;
using System.Web.Mvc;

namespace Mall.Site
{

    /// 

    /// 执行耗时监测
    /// 
    public class StopwatchFilter : ActionFilterAttribute
    {
        Stopwatch wat = new Stopwatch();
        Stopwatch swAsync = new Stopwatch();

        public override void OnActionExecuted(ActionExecutedContext filterContext)
        {
            swAsync.Stop();
            if (swAsync.ElapsedMilliseconds>0)
            {
                string msg = string.Format("页面{0},线程id={1},Action执行时间{2}毫秒", filterContext.HttpContext.Request.RawUrl, Thread.CurrentThread.ManagedThreadId, swAsync.ElapsedMilliseconds);
                FrameWork.log4net.LogHelper.LogInfo(msg);
            }       
        }
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            swAsync.Reset();
            swAsync.Start();
        }


        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            wat.Stop();
            if (wat.ElapsedMilliseconds>0)
            {               
                string msg = string.Format("页面{0},线程id={1},View执行时间{2}毫秒", filterContext.HttpContext.Request.RawUrl, Thread.CurrentThread.ManagedThreadId, wat.ElapsedMilliseconds);
                FrameWork.log4net.LogHelper.LogInfo(msg);
            }   
        }
        public override void OnResultExecuting(ResultExecutingContext filterContext)
        {
            wat.Reset();
            wat.Start();
        }        
    }
}