如何让MVC操作返回404

I have an action that takes in a string that is used to retrieve some data. If this string results in no data being returned (maybe because it has been deleted), I want to return a 404 and display an error page.

我有一个动作，它接收一个用来检索数据的字符串。如果这个字符串没有返回数据(可能是因为它被删除了)，我想返回404并显示一个错误页面。

I currently just use return a special view that display a friendly error message specific to this action saying that the item was not found. This works fine, but would ideally like to return a 404 status code so search engines know that this content no longer exists and can remove it from the search results.

我目前只使用返回一个特殊的视图，该视图显示一个针对此操作的友好错误消息，表示没有找到该项。这工作得很好，但理想情况下希望返回404状态码，以便搜索引擎知道该内容不再存在，并可以将其从搜索结果中删除。

What is the best way to go about this?

最好的办法是什么?

Is it as simple as setting Response.StatusCode = 404?

就像设置响应一样简单。StatusCode = 404 ?

12 个解决方案

#1

There are multiple ways to do it,

有多种方法，

You are right in common aspx code it can be assigned in your specified way
您在公共aspx代码中是正确的，它可以按照您指定的方式分配。
throw new HttpException(404, "Some description");
抛出新的HttpException(404，“Some description”);

#2

138

In ASP.NET MVC 3 and above you can return a HttpNotFoundResult from the controller.

在ASP。netmvc 3和以上可以从控制器返回一个HttpNotFoundResult。

return new HttpNotFoundResult("optional description");

#3

In MVC 4 and above you can use the built-in HttpNotFound helper methods:

在MVC 4及以上版本中，您可以使用内置的HttpNotFound helper方法:

if (notWhatIExpected)
{
    return HttpNotFound();
}

或

if (notWhatIExpected)
{
    return HttpNotFound("I did not find message goes here");
}

#4

Code :

代码:

if (id == null)
{
  throw new HttpException(404, "Your error message");//RedirectTo NoFoundPage
}

Web.config

. config

<customErrors mode="On">
  <error statusCode="404" redirect="/Home/NotFound" />
</customErrors>

#5

I've used this:

我用这个:

Response.StatusCode = 404;
return null;

#6

In NerdDinner eg. Try it

在NerdDinner如。试一试

public ActionResult Details(int? id) {
    if (id == null) {
        return new FileNotFoundResult { Message = "No Dinner found due to invalid dinner id" };
    }
    ...
}

#7

If you are working with .NET Core, you can return NotFound()

如果使用。net Core，可以返回NotFound()

#8

None of the above examples worked for me until I added the middle line below:

以上的例子中没有一个对我有效，直到我添加了下面的中线:

public ActionResult FourOhFour()
{
    Response.StatusCode = 404;
    Response.TrySkipIisCustomErrors = true; // this line made it work
    return View();
}

#9

I use:

我使用:

Response.Status = "404 NotFound";

This works for me :-)

这适合我:-)

#10

In .NET Core 1.1:

在。net 1.1核心:

return new NotFoundObjectResult(null);

#11

You can also do:

你也可以做的事:

        if (response.Data.IsPresent == false)
        {
            return StatusCode(HttpStatusCode.NoContent);
        }

#12

-1

Please try the following demo code:

请尝试以下演示代码:

public ActionResult Test()

{
　　return new HttpStatusCodeResult (404,"Not found");
}

#1