asp.net mvc輸出自定義404等錯誤頁面，非302跳轉。

朋友問到一個問題，如何輸出自定義錯誤頁面，不使用302跳轉。目前頁面位址不能改變.

還要執行一些代碼等,生成一些錯誤資訊,友善使用者送出回報.

500錯誤，mvc架構已經有現成解決方法：

filters.Add(new HandleErrorAttribute());

404錯誤目前想到的解決方法：

先上代碼 Global.asax：

asp.net mvc輸出自定義404等錯誤頁面，非302跳轉。

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代碼：

asp.net mvc輸出自定義404等錯誤頁面，非302跳轉。

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     }

web.config

<system.webServer>
    <httpErrors errorMode="Detailed" />

目前有幾個疑惑，沒有深究：還望有網友知道能解惑一二，就不用去google 扒源碼了。

1.如果不加這行代碼，預設輸出的是：text/html; 浏覽器直接輸出内容,不做解析.

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

2.iis不會使用gzip壓縮,不管輸出的404錯誤頁面有多大,都不會自動壓縮.是以使用下面這種替換方式.

　　[Compress]
    public class SysController : Controller

猜測:

mvc 在action的Execute階段後還做了不少事情,比如上面提到的1,2點.正常200請求會執行預設的filter等階段.

而當是404請求時,跳過了這些階段.可能500請求也類似.

僅僅是猜測,還未驗證,