c# – 如何使用ActionFilterAttribute记录运行时间？

public class RunningTimeAttribute : ActionFilterAttribute
    {
        private readonly ILogFactory _logFactory;
        private readonly ITimerFactory _timerFactory;
        private ITimer _timer;
        private ILogger _logger;

        public RunningTimeAttribute(ILogFactory logFactory,ITimerFactory timerFactory) {
            if(logFactory == null)
                throw new ArgumentNullException("logFactory");
            if(timerFactory == null)
                throw new ArgumentNullException("timerFactory");

            _logFactory = logFactory;
            _timerFactory = timerFactory;
        }

        public override void OnActionExecuting(HttpActionContext actionContext) {
            base.OnActionExecuting(actionContext);
            OnBeforeAction(actionContext);
        }

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext) {
            OnAfterAction(actionExecutedContext);
            base.OnActionExecuted(actionExecutedContext);
        }

        private void OnBeforeAction(HttpActionContext actionContext) {
            var controllerName = actionContext.ControllerContext.Controller.GetType().FullName;
            var actionName = actionContext.ActionDescriptor.ActionName;

            _logger = _logFactory.Create(controllerName);
            _logger.Trace("Action "{0}" begins execution",actionName);

            _timer = _timerFactory.Create();
            _timer.Start();
        }

        private void OnAfterAction(HttpActionExecutedContext actionExecutedContext) {
            var actionName = actionExecutedContext.ActionContext.ActionDescriptor.ActionName;

            _timer.Stop();
            _logger.Trace("Time elapsed for action "{0}": {1} msec",actionName,_timer.ElapsedMilliseconds);
        }

}

但是,动作过滤器充当单例,因此当OnActionExecuted运行时,我无法确定_logger和_timer是否对应于为同一动作OnActionExecuting创建的那些.

例如.

>动作Foo1开始执行. _logger =“logger1”,_ timer =“timer1”.
>动作Foo2开始执行. _logger =“logger2”,_ timer =“timer2”(它们被覆盖)
>动作Foo1结束执行.它会停止计时器并记录经过的时间,这是无意义的(end1-start2).

问题：OnActionExecuted中是否有一种方式可以识别它对应的OnActionExecuting？如果有一些唯一的动作标识符,我可以将它用作Dictionary的一个键来存储任何与动作相关的对象,如记录器和定时器.有没有？或其他一些解决方案？