MVC TIP4：为捕获路由及通用异常处理

对于未路由到的URL，可以如下处理。

1：首先，准备控制器

    public class ErrorController : Controller
    {
        public ActionResult Index(string error)
        {
            ViewData["Title"] = "WebSite 网站内部错误";
            ViewData["Description"] = error;
            return View("Index");   //全部路由到Error下的Index视图
        }
        public ActionResult HttpError404(string error)
        {
            ViewData["Title"] = "HTTP 404- 无法找到文件";
            ViewData["Description"] = error;
            return View("Index");
        }
        public ActionResult HttpError500(string error)
        {
            ViewData["Title"] = "HTTP 500 - 内部服务器错误";
            ViewData["Description"] = error;
            return View("Index");
        }
        public ActionResult General(string error)
        {
            ViewData["Title"] = "HTTP 发生错误";
            ViewData["Description"] = error;
            return View("Index");
        }  
    }

2：Error下的Index视图

代码：

3：在Global.aspx中进行处理

添加如下方法：

        protected void Application_Error(object sender, EventArgs e)
        {
            Response.Clear();
            Exception exception = Server.GetLastError();
            HttpException httpException = exception as HttpException;
            RouteData routeData = new RouteData();
            routeData.Values.Add("controller", "Error");
            if (exception == null)
            {
                routeData.Values.Add("action", "Index");
            }
            else if (httpException == null)
            {
                routeData.Values.Add("action", "Index");
            }
            else
            {
                switch (httpException.GetHttpCode())
                {
                    case 404:
                        routeData.Values.Add("action", "HttpError404");
                        break;
                    case 500:
                        routeData.Values.Add("action", "HttpError500");
                        break;
                    default:
                        routeData.Values.Add("action", "General");
                        break;
                }
            }
            // Pass exception details to the target error View.  
            routeData.Values.Add("error", exception.Message);
            // Clear the error on server.  
            Server.ClearError();
            // Call target Controller and pass the routeData.  
            IController errorController = new ErrorController();
            errorController.Execute(new RequestContext(new HttpContextWrapper(Context), routeData));
        }

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