NotFound()似乎无法正常工作 [英] NotFound() doesn't seem to work as expected
问题描述
我是ASP.NET内核的新手，所以我希望您对此感到满意.这类似于这个未回答的问题.
I'm new to ASP.NET core, so I hope you bear with me on this one. This is similar to this unanswered question.
当我测试一个全新的C#MVC项目时，如果输入错误的URL，则没有任何信息.只是一个空白页.
When I'm testing a brand new C# MVC project, and I enter a wrong URL, there's no info. Just a blank page.
为解决此问题，我改编了startup.cs，添加了UseStatusCodePagesWithReExecute()以返回静态404.html页面.这行得通.
To solve this, I have adapted startup.cs adding a UseStatusCodePagesWithReExecute() to return a static 404.html page. This works.
到目前为止，很好.
现在，我正在编写基本的登录逻辑.出于测试目的，缺少post参数时，我将调用return NotFound();.这不会返回任何内容.我知道404响应不正确，但是我在生成的代码中看到NotFound();，这就是返回空白页的内容，因此我想在继续之前解决该问题.
Now, I am coding a basic login logic. For testing purposes, I'm calling return NotFound(); when the post parameters are missing. This doesn't return anything. I'm aware that 404 is not the correct response, but I have seen NotFound(); in the generated code and I think that's what's returning blank pages, so I want to solve that before moving on.
似乎未为此调用app.UseDeveloperException();.我不确定如何测试.
The app.UseDeveloperException(); doesn't seem to be called for this. I'm not sure how to test that.
是否有一种方法可以覆盖NotFound();行为以某种方式获取404.html?
Is there a way to override the NotFound(); behavior to get a 404.html somehow?
This is the Tutorial I have used to set up my project.
根据Alexander Powolozki的评论，我已将NotFound();替换为Redirect("~/404.html");.这行得通.
Based on the comments of Alexander Powolozki, I have replaced NotFound(); with Redirect("~/404.html");. This works.
// Wherever you want to return your standard 404 page
return Redirect("Home/StatusCode?code=404");
public class HomeController : Controller
{
// This method allows for other status codes as well
public IActionResult StatusCode(int? code)
{
// This method is invoked by Startup.cs >>> app.UseStatusCodePagesWithReExecute("/Home/StatusCode", "?code={0}");
if (code.HasValue)
{
// here is the trick
this.HttpContext.Response.StatusCode = code.Value;
}
//return a static file.
try
{
return File("~/" + code + ".html", "text/html");
}
catch (FileNotFoundException)
{
return Redirect("Home/StatusCode?code=404");
}
}
}
推荐答案
在对问题进行了更多研究之后，我发现了一种无需使用Alexander Powolozki建议的使用重定向的方法.
After working a little more on the question, I have found a way to do it without using Redirect as suggested by Alexander Powolozki.
我创建了一个Utilities类以返回404代码和404.html.
I have created a Utilities class to return the 404 code and 404.html.
在HomeController中，我具有StatusCode IActionResult.
In the HomeController, I have the StatusCode IActionResult.
// This method is invoked by Startup.cs >>> app.UseStatusCodePagesWithReExecute("/Home/StatusCode", "?code={0}");
public IActionResult StatusCode(int? code)
{
// Call the static method
return Utilities.StatusCode(code: code.Value, this.HttpContext);
}
在模型中，我添加了一个Utilities.cs.
In Models, I've added a Utilities.cs.
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;
using System.IO;
namespace MediaMgt.Models
{
public static class Utilities
{
public static IActionResult StatusCode(int code, HttpContext httpContext)
{
// here is the trick
httpContext.Response.StatusCode = code;
//return a static file.
try
{
return new VirtualFileResult("~/" + code + ".html", "text/html");
}
catch (FileNotFoundException)
{
httpContext.Response.StatusCode = 404;
return new VirtualFileResult("~/404.html", "text/html");
}
}
}
}
这样做而不是使用Redirect方法的原因是为了避免使用302往返客户端.此方法同时返回404错误代码和标准404.html.
The reason to do it like this instead of using the Redirect method is to avoid a round-trip to the client with a 302. This method returns both the 404 error code and a standard 404.html.
您可以从此处轻松添加更多功能.
You can easily add more functionality from here on.
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