asp.net mvc输出自定义404等错误页面，非302跳转。

朋友问到一个问题，如何输出自定义错误页面，不使用302跳转。当前页面地址不能改变.

还要执行一些代码等,生成一些错误信息,方便用户提交反馈.

 

500错误，mvc框架已经有现成解决方法：

filters.Add(new HandleErrorAttribute());

404错误目前想到的解决方法：

先上代码 Global.asax：

 1 protected void Application_Error(object sender, EventArgs e)

 2         {

 3             var ex = Server.GetLastError() as HttpException;

 4             if (ex == null)

 5                 return;

 6 

 7             var httpStatusCode = ex.GetHttpCode();

 8 

 9             if (httpStatusCode == 404)

10             {

11                 var httpContext = (sender as MvcApplication).Context;

12 

13                 httpContext.ClearError();

14                 httpContext.Response.Clear();

15                 httpContext.Response.StatusCode = 404;

16                 ServiceFocus.LogService.AddLog(ex);

17 

18                 httpContext.Response.ContentType = "text/html; charset=utf-8";

19                 var routeData = new RouteData();

20                 routeData.Values["controller"] = "Sys";

21                 routeData.Values["action"] = "NotFound";

22                 var requestContext = new RequestContext(new HttpContextWrapper(httpContext), routeData);

23                 var controller = ControllerBuilder.Current.GetControllerFactory().CreateController(requestContext, "Sys") as SysController;

24                 //controller.ViewData.Model=model;

25                 (controller as IController).Execute(requestContext);

26                 ControllerBuilder.Current.GetControllerFactory().ReleaseController(controller);

27             }

28         }

View Code

controller代码：

 1 public class CompressAttribute : ActionFilterAttribute

 2     {

 3         public override void OnActionExecuting(ActionExecutingContext filterContext)

 4         {

 5             var acceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];

 6             if (!string.IsNullOrEmpty(acceptEncoding))

 7             {

 8                 acceptEncoding = acceptEncoding.ToLower();

 9                 var response = filterContext.HttpContext.Response;

10                 if (acceptEncoding.Contains("gzip"))

11                 {

12                     response.AppendHeader("Content-encoding", "gzip");

13                     response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);

14                 }

15                 else if (acceptEncoding.Contains("deflate"))

16                 {

17                     response.AppendHeader("Content-encoding", "deflate");

18                     response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);

19                 }

20             }

21         }

22     }

23     [Compress]

24     public class SysController : Controller

25     {

26         //

27         // GET: /sys/

28 

29         public ActionResult NotFound()

30         {

31             return View();

32         }

33         public ActionResult Error()

34         {

35             return View();

36         }

37     }

View Code

web.config

<system.webServer>

    <httpErrors errorMode="Detailed" />

目前有几个疑惑，没有深究：还望有网友知道能解惑一二，就不用去google 扒源码了。

 

1.如果不加这行代码，默认输出的是：text/html; 浏览器直接输出内容,不做解析.

httpContext.Response.ContentType = "text/html; charset=utf-8";

2.iis不会使用gzip压缩,不管输出的404错误页面有多大,都不会自动压缩.所以使用下面这种替换方式.

　　[Compress]

    public class SysController : Controller

猜测:

mvc 在action的Execute阶段后 还做了不少事情,比如上面提到的1,2点.正常200请求会执行默认的filter等阶段.

而当是404请求时,跳过了这些阶段.可能500请求也类似.

仅仅是猜测,还未验证,