blocks|key|1234589|text|我使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1234590|Response.Status+=+"404+NotFound";|code-block|syntax|javascript|1234591|这对我很有效:-)|1234592|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I use:

<pre><code>Response.Status = "404 NotFound";
</code></pre>

This works for me :-)

blocks|key|1234631|text|在NerdDinner中，例如试试it|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1234632|public+ActionResult+Details(int?+id)+{
++++if+(id+==+null)+{
++++++++return+new+FileNotFoundResult+{+Message+=+"No+Dinner+found+due+to+invalid+dinner+id"+};
++++}
++++...
}|code-block|syntax|javascript|1234633|entityMap|0|LINK|mutability|MUTABLE|url|http://www.nerddinner.com/2^0|H|2|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

In NerdDinner eg. Try <a href="http://www.nerddinner.com/2" rel="noreferrer">it</a>

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

blocks|key|1020018|text|我使用了这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1020019|Response.StatusCode+=+404;
return+null;|code-block|syntax|javascript|1020020|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've used this:

<pre><code>Response.StatusCode = 404;
return null;
</code></pre>

blocks|key|1234659|text|在ASP.NET+MVC3及更高版本中，你可以从控制器返回一个HttpNotFoundResult。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1234660|return+new+HttpNotFoundResult("optional+description");|code-block|syntax|javascript|1234661|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.web.mvc.httpnotfoundresult(v=vs.98).aspx^0|V|I|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

In ASP.NET MVC 3 and above you can return a <a href="http://msdn.microsoft.com/en-us/library/system.web.mvc.httpnotfoundresult(v=vs.98).aspx" rel="noreferrer">HttpNotFoundResult</a> from the controller.

<pre><code>return new HttpNotFoundResult("optional description");
</code></pre>

blocks|key|1234717|text|在MVC4及更高版本中，您可以使用内置的HttpNotFound助手方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1234718|if+(notWhatIExpected)
{
++++return+HttpNotFound();
}|code-block|syntax|javascript|1234719|或|1234720|if+(notWhatIExpected)
{
++++return+HttpNotFound("I+did+not+find+message+goes+here");
}|1234721|entityMap^0|K|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

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

<pre><code>if (notWhatIExpected)
{
 return HttpNotFound();
}
</code></pre>

or

<pre><code>if (notWhatIExpected)
{
 return HttpNotFound("I did not find message goes here");
}
</code></pre>

blocks|key|1234759|text|在我添加以下中间行之前，上面的示例对我都不起作用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1234760|public+ActionResult+FourOhFour()
{
++++Response.StatusCode+=+404;
++++Response.TrySkipIisCustomErrors+=+true;+//+this+line+made+it+work
++++return+View();
}|code-block|syntax|javascript|1234761|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

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

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

blocks|key|1234821|text|请尝试以下demo代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1234822|public+ActionResult+Test()

{
　　return+new+HttpStatusCodeResult+(404,"Not+found");
}|code-block|syntax|javascript|1234823|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Please try the following demo code:

<pre><code>public ActionResult Test()

{
　　return new HttpStatusCodeResult (404,"Not found");
}
</code></pre>

blocks|key|1234828|text|您还可以执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1234829|++++++++if+(response.Data.IsPresent+==+false)
++++++++{
++++++++++++return+StatusCode(HttpStatusCode.NoContent);
++++++++}|code-block|syntax|javascript|1234830|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can also do:

<pre><code> if (response.Data.IsPresent == false)
 {
 return StatusCode(HttpStatusCode.NoContent);
 }
</code></pre>

blocks|key|1020286|text|如果您使用的是.NET核心，您可以使用return+NotFound()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1020287|entityMap^0|J|H|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

If you are working with .NET Core, you can <code>return NotFound()</code>

blocks|key|1020296|text|在.NET核心1.1中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1020297|return+new+NotFoundObjectResult(null);|code-block|syntax|javascript|1020298|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In .NET Core 1.1:

<pre><code>return new NotFoundObjectResult(null);
</code></pre>

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. 

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.

What is the best way to go about this?

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

How to get MVC action to return 404

我有一个操作，它接受一个用于检索某些数据的字符串。如果这个字符串没有返回任何数据(可能是因为它已经被删除了)，我想返回一个404并显示一个错误页面。我目前只使用了return这个特殊的视图，它会显示一条友好的错误消息，指出没有找到该项目。这可以很好地工作，但理想情况下会返回404状态代码，以便搜索引擎知道该内容不再存在...

问如何让MVC操作返回404
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