asp.net mvc 使用过滤器捕获异常 写入日志

 public class ExceptionFilters : System.Web.Mvc.FilterAttribute, System.Web.Mvc.IExceptionFilter
    {
        public void OnException(ExceptionContext filterContext)
        {
            if (!filterContext.ExceptionHandled)
            {
                string controllerName = (string)filterContext.RouteData.Values["controller"];
                string actionName = (string)filterContext.RouteData.Values["action"];
                string ip = HttpContext.Current.Request.UserHostAddress;
                string param = filterContext.HttpContext.Request.HttpMethod;
                //记录日志
                LogFile.WriteErrorLog(DateTime.Now + string.Format(" Location：{0}/{1} Param：{2} UserIP：{3} Exception：{4}", controllerName, actionName, param, ip, filterContext.Exception.Message));
                //设置返回结果
                filterContext.Result = new JsonResult
                {
                    Data = new ResultU { IsOK = false, Code = 999, Msg = filterContext.Exception.Message },
                    JsonRequestBehavior = JsonRequestBehavior.AllowGet
                };
            }

            filterContext.ExceptionHandled = true;//返回结果是JsonResult，则设置异常已处理


        }
    }

 public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            //filters.Add(new HandleErrorAttribute());
            filters.Add(new ExceptionFilters());
        }
    }