ASP.NET Web API 接口执行时间监控

using System; 
using System.Collections.Generic;    
using System.Diagnostics;    
using System.Linq;    
using System.Web;    
using System.Web.Http.Controllers;    
using System.Web.Http.Filters;
namespace ContactManager.Filters   
{    
    public class TimingActionFilter : ActionFilterAttribute    
    {    
        private const string Key = "__action_duration__";
        public override void OnActionExecuting(HttpActionContext actionContext)   
        {    
            if (SkipLogging(actionContext))    
            {    
                return;    
            }    
            var stopWatch = new Stopwatch();    
            actionContext.Request.Properties[Key] = stopWatch;    
            stopWatch.Start();    
        }
        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)   
        {    
            if (!actionExecutedContext.Request.Properties.ContainsKey(Key))    
            {    
                return;    
            }
            var stopWatch = actionExecutedContext.Request.Properties[Key] as Stopwatch;   
            if (stopWatch != null)    
            {    
                stopWatch.Stop();    
                var actionName = actionExecutedContext.ActionContext.ActionDescriptor.ActionName;    
                var controllerName = actionExecutedContext.ActionContext.ActionDescriptor.ControllerDescriptor.ControllerName;    
                Debug.Print(string.Format("[Execution of{0}- {1} took {2}.]", controllerName, actionName, stopWatch.Elapsed));    
            }
        }
        private static bool SkipLogging(HttpActionContext actionContext)   
        {    
            return actionContext.ActionDescriptor.GetCustomAttributes<NoLogAttribute>().Any() ||    
                    actionContext.ControllerContext.ControllerDescriptor.GetCustomAttributes<NoLogAttribute>().Any();    
        }
    }
    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true)]   
    public class NoLogAttribute : Attribute    
    {
    }   
}