public class ErrorLog: HandleErrorAttribute

    {

        public override void OnException(ExceptionContext filterContext)

        {

            if(!filterContext.ExceptionHandled)

            {

                //当前Controller名称

                string controllName = (string)filterContext.RouteData.Values["controller"];

                //当前Action

                string actionName = (string)filterContext.RouteData.Values["action"];

                //定义一个HandErrorInfo，用于Error视图展示异常信息

                HandleErrorInfo model = new HandleErrorInfo(filterContext.Exception, controllName, actionName);

                //时间用来给txt命名

                string thisTime = DateTime.Now.ToString("yyyyMMdd");

                string errorDetails = $"出错时间：{DateTime.Now.ToString()},错误发生在{model.ControllerName}控制器的{model.ActionName},错误类型：{model.Exception.Message}";

                string splitLine = "============================下一条==============================";

                //日志存放位置，在项目目录里面一个月一个文件夹，一天一个文件

                string path = HttpContext.Current.Server.MapPath(@"\ErrorLog\" + DateTime.Now.Year.ToString()+ @"\" + DateTime.Now.ToString("MM") + @"\" );

                //判断文件夹不存在就创建

                if (!Directory.Exists(path))

                    Directory.CreateDirectory(path);

                //写入日志

                using (System.IO.StreamWriter file = new System.IO.StreamWriter(path + thisTime+".txt", true))

                {

                    file.WriteLine(errorDetails);

                    file.WriteLine(model.Exception.StackTrace);

                    file.WriteLine(splitLine);

                }

                //出错跳转到指定页面，如果Global.asax写了Application_Error方法可以不用写

                ViewResult result = new ViewResult

                {

                    ViewName = this.View,//设置异常时跳转的404页面

                    ViewData = new ViewDataDictionary<HandleErrorInfo>(model)  //定义ViewData，泛型

                };

                filterContext.Result = result;

                filterContext.ExceptionHandled = true;//设置异常已处理

            }

        }

    }

public class FilterConfig

    {

        public static void RegisterGlobalFilters(GlobalFilterCollection filters)

        {

            filters.Add(new ErrorLog() { View="Error"});

        }

    }

public class MvcApplication : System.Web.HttpApplication

    {

        protected void Application_Start()

        {

            AreaRegistration.RegisterAllAreas();

            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

        }

    }

/// <summary>

        /// 图片上传

        /// </summary>

        /// <param name="file">图片</param>

        /// <returns></returns>

        public ActionResult FileUpLoad1(HttpPostedFileBase file)

        {

            var ret = string.Empty;

            try

            {

                string fileName = Guid.NewGuid()+file.FileName;

                string filePath = Server.MapPath(@"\FileUp2\");

                //if (!Directory.Exists(filePath))

                   // Directory.CreateDirectory(filePath);

                file.SaveAs(Path.Combine(filePath, fileName));

            }

            catch (Exception ex)

            {

                ret = ex.Message + ":" + ex.InnerException;

                throw new Exception (ex.Message + ":" + ex.InnerException);

            }

            if(string.IsNullOrEmpty(ret))

                return Json(new { code = "", msg = "文件上传成功！", data = "" });

            else

                return Json(new { code = "", msg = "文件上传失败！", data = ret });

        }