Asp.net MVC学习日记四（如果无法Route，指向自定义的错误页面）

这里面要分两种情况：一是，默认的Route无法匹配；二是，默认的Route匹配错误。

前提工作：

新建一个ErrorController

  public class ErrorController : Controller
    {
        public ActionResult Http404()
        {
            return View();
        }
    }

再添加Http404.aspx

 

针对第一种情况：

1、在Models下新建MyControllerFactory类

  public class MyControllerFactory : DefaultControllerFactory
    {
        protected override IController GetControllerInstance(System.Web.Routing.RequestContext requestContext,Type controllerType)
        {
            try
            {
                return base.GetControllerInstance(requestContext,controllerType);
            }
            catch (HttpException ex)
            {
                int httpCode = ex.GetHttpCode();
                if (httpCode == (int)HttpStatusCode.NotFound)
                {
                    IController controller = new ErrorController();
                    ((ErrorController)controller).Http404();
                    return controller;
                }
                else
                {
                    throw ex;
                }
            }
        }
    }

2、在Global.asax文件Application_Start方法中，添加

ControllerBuilder.Current.SetControllerFactory(new MyControllerFactory());

那么http://localhost:1124/RandomController/RandomAction/RandomId会指定到自己的错误页面，但是http://localhost:1124/Homer/RandomAction/RandomId则不会。

那就要使用第二种情况了：

1、新建BaseController

   public class BaseController : Controller
    {
        protected override void HandleUnknownAction(string actionName)
        {
            RouteTo404(HttpContext);
        }
        public ActionResult RouteTo404(HttpContextBase context)
        {
            IController errorController = new ErrorController();
            RouteData rd = new RouteData();
            rd.Values.Add("controller", "Error");
            rd.Values.Add("action", "Http404");
            errorController.Execute(new RequestContext(context, rd));
            return new EmptyResult();
        }
    }

2、将现有的控制器把由继承自Controller改为BaseController

 

这样就ok了