blocks|key|352069|text|我不知道答案，于是ASP.NET团队here问道。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|352070|因此，诀窍是将签名更改为HttpResponseMessage并使用Request.CreateResponse。|style|CODE|352071|[ResponseType(typeof(User))]
public+HttpResponseMessage+GetUser(HttpRequestMessage+request,+int+userId,+DateTime+lastModifiedAtClient)
{
++++var+user+=+new+DataEntities().Users.First(p+=>+p.Id+==+userId);
++++if+(user.LastModified+<=+lastModifiedAtClient)
++++{
+++++++++return+new+HttpResponseMessage(HttpStatusCode.NotModified);
++++}
++++return+request.CreateResponse(HttpStatusCode.OK,+user);
}|code-block|syntax|javascript|352072|entityMap|0|LINK|mutability|MUTABLE|url|http://aspnetwebstack.codeplex.com/discussions/356306^0|I|4|0|0|C|J|Y|M|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@$A|Z|B|10|F|G]|$A|11|B|12|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|13|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

I did not know the answer so asked the ASP.NET team <a href="http://aspnetwebstack.codeplex.com/discussions/356306" rel="noreferrer">here</a>.

So the trick is to change the signature to <code>HttpResponseMessage</code> and use <code>Request.CreateResponse</code>.

<pre><code>[ResponseType(typeof(User))]
public HttpResponseMessage GetUser(HttpRequestMessage request, int userId, DateTime lastModifiedAtClient)
{
 var user = new DataEntities().Users.First(p =&gt; p.Id == userId);
 if (user.LastModified &lt;= lastModifiedAtClient)
 {
 return new HttpResponseMessage(HttpStatusCode.NotModified);
 }
 return request.CreateResponse(HttpStatusCode.OK, user);
}
</code></pre>

blocks|key|352144|text|如果您希望将操作签名保留为返回用户，也可以执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352145|public+User+GetUser(int+userId,+DateTime+lastModifiedAtClient)+|code-block|syntax|javascript|352146|如果您想返回200以外的其他内容，那么可以在操作中抛出一个HttpResponseException，并传入要发送给客户端的HttpResponseMessage。|offset|length|style|CODE|352147|entityMap^0|0|0|6|3|T|L|1Q|J|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|N|$]]

You can also do the following if you want to preserve the action signature as returning User:

<pre><code>public User GetUser(int userId, DateTime lastModifiedAtClient) 
</code></pre>

If you want to return something other than <code>200</code> then you throw an <code>HttpResponseException</code> in your action and pass in the <code>HttpResponseMessage</code> you want to send to the client.

blocks|key|352159|text|在MVC+5中，事情变得更容易了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352160|return+new+StatusCodeResult(HttpStatusCode.NotModified,+this);|code-block|syntax|javascript|352161|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 MVC 5, things got easier:

<pre><code>return new StatusCodeResult(HttpStatusCode.NotModified, this);
</code></pre>

blocks|key|568324|text|我讨厌翻旧文章，但这是谷歌搜索的第一个结果，我对这个问题花了很长时间(即使是在你们的支持下)。所以没什么.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|568325|希望我的解决方案能帮助那些同样感到困惑的人。|568326|namespace+MyApplication.WebAPI.Controllers
{
++++public+class+BaseController+:+ApiController
++++{
++++++++public+T+SendResponse<T>(T+response,+HttpStatusCode+statusCode+=+HttpStatusCode.OK)
++++++++{
++++++++++++if+(statusCode+!=+HttpStatusCode.OK)
++++++++++++{
++++++++++++++++//+leave+it+up+to+microsoft+to+make+this+way+more+complicated+than+it+needs+to+be
++++++++++++++++//+seriously+i+used+to+be+able+to+just+set+the+status+and+leave+it+at+that+but+nooo...+now+
++++++++++++++++//+i+need+to+throw+an+exception+
++++++++++++++++var+badResponse+=
++++++++++++++++++++new+HttpResponseMessage(statusCode)
++++++++++++++++++++{
++++++++++++++++++++++++Content+=++new+StringContent(JsonConvert.SerializeObject(response),+Encoding.UTF8,+"application/json")
++++++++++++++++++++};

++++++++++++++++throw+new+HttpResponseException(badResponse);
++++++++++++}
++++++++++++return+response;
++++++++}
++++}
}|code-block|syntax|javascript|568327|然后直接从BaseController继承|568328|[RoutePrefix("api/devicemanagement")]
public+class+DeviceManagementController+:+BaseController
{...|568329|然后使用它|568330|[HttpGet]
[Route("device/search/{property}/{value}")]
public+SearchForDeviceResponse+SearchForDevice(string+property,+string+value)
{
++++//todo:+limit+search+property+here?
++++var+response+=+new+SearchForDeviceResponse();

++++var+results+=+_deviceManagementBusiness.SearchForDevices(property,+value);

++++response.Success+=+true;
++++response.Data+=+results;

++++var+statusCode+=+results+==+null+%7C%7C+!results.Any()+?+HttpStatusCode.NoContent+:+HttpStatusCode.OK;

++++return+SendResponse(response,+statusCode);
}|568331|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I hate bumping old articles but this is the first result for this in google search and I had a heck of a time with this problem (even with the support of you guys). So here goes nothing...

Hopefully my solution will help those that also was confused.

<pre><code>namespace MyApplication.WebAPI.Controllers
{
 public class BaseController : ApiController
 {
 public T SendResponse&lt;T&gt;(T response, HttpStatusCode statusCode = HttpStatusCode.OK)
 {
 if (statusCode != HttpStatusCode.OK)
 {
 // leave it up to microsoft to make this way more complicated than it needs to be
 // seriously i used to be able to just set the status and leave it at that but nooo... now 
 // i need to throw an exception 
 var badResponse =
 new HttpResponseMessage(statusCode)
 {
 Content = new StringContent(JsonConvert.SerializeObject(response), Encoding.UTF8, "application/json")
 };

 throw new HttpResponseException(badResponse);
 }
 return response;
 }
 }
}
</code></pre>

and then just inherit from the BaseController 

<pre><code>[RoutePrefix("api/devicemanagement")]
public class DeviceManagementController : BaseController
{...
</code></pre>

and then using it

<pre><code>[HttpGet]
[Route("device/search/{property}/{value}")]
public SearchForDeviceResponse SearchForDevice(string property, string value)
{
 //todo: limit search property here?
 var response = new SearchForDeviceResponse();

 var results = _deviceManagementBusiness.SearchForDevices(property, value);

 response.Success = true;
 response.Data = results;

 var statusCode = results == null || !results.Any() ? HttpStatusCode.NoContent : HttpStatusCode.OK;

 return SendResponse(response, statusCode);
}
</code></pre>

blocks|key|352585|text|对于ASP.NET+Web+2，this+post+from+MS建议将方法的返回类型更改为IHttpActionResult。然后，您可以返回内置的IHttpActionResult实现，如Ok、BadRequest等(see+here)，也可以返回您自己的实现。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|352586|对于您的代码，可以这样做：|352587|public+IHttpActionResult+GetUser(int+userId,+DateTime+lastModifiedAtClient)
{
++++var+user+=+new+DataEntities().Users.First(p+=>+p.Id+==+userId);
++++if+(user.LastModified+<=+lastModifiedAtClient)
++++{
++++++++return+StatusCode(HttpStatusCode.NotModified);
++++}
++++return+Ok(user);
}|code-block|syntax|javascript|352588|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/aspnet/web-api/overview/getting-started-with-aspnet-web-api/action-results|1|https://docs.microsoft.com/en-us/dotnet/api/system.web.http.apicontroller.internalservererror?view=aspnetcore-2.2^0|1A|H|23|H|2O|2|2R|A|G|H|0|33|8|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]|$9|18|A|19|1|1A]]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

For ASP.NET Web Api 2, <a href="https://docs.microsoft.com/en-us/aspnet/web-api/overview/getting-started-with-aspnet-web-api/action-results" rel="noreferrer">this post from MS</a> suggests to change the method's return type to <code>IHttpActionResult</code>. You can then return a built in <code>IHttpActionResult</code> implementation like <code>Ok</code>, <code>BadRequest</code>, etc (<a href="https://docs.microsoft.com/en-us/dotnet/api/system.web.http.apicontroller.internalservererror?view=aspnetcore-2.2" rel="noreferrer">see here</a>) or return your own implementation.

For your code, it could be done like:

<pre><code>public IHttpActionResult GetUser(int userId, DateTime lastModifiedAtClient)
{
 var user = new DataEntities().Users.First(p =&gt; p.Id == userId);
 if (user.LastModified &lt;= lastModifiedAtClient)
 {
 return StatusCode(HttpStatusCode.NotModified);
 }
 return Ok(user);
}
</code></pre>

blocks|key|352438|text|.net核心2.2返回304状态代码。这是在使用ApiController。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352439|++++[HttpGet]
++++public+ActionResult<YOUROBJECT>+Get()
++++{
++++++++return+StatusCode(304);
++++}|code-block|syntax|javascript|352440|您也可以选择返回一个带有响应的对象|352441|++++[HttpGet]
++++public+ActionResult<YOUROBJECT>+Get()
++++{
++++++++return+StatusCode(304,+YOUROBJECT);+
++++}|352442|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

.net core 2.2 returning 304 status code. This is using an ApiController.

<pre><code> [HttpGet]
 public ActionResult&lt;YOUROBJECT&gt; Get()
 {
 return StatusCode(304);
 }
</code></pre>

Optionally you can return an object with the response

<pre><code> [HttpGet]
 public ActionResult&lt;YOUROBJECT&gt; Get()
 {
 return StatusCode(304, YOUROBJECT); 
 }
</code></pre>

blocks|key|568251|text|我不喜欢更改签名来使用HttpCreateResponse类型，所以我想出了一个稍微扩展的解决方案来隐藏它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|568252|public+class+HttpActionResult+:+IHttpActionResult
{
++++public+HttpActionResult(HttpRequestMessage+request)+:+this(request,+HttpStatusCode.OK)
++++{
++++}

++++public+HttpActionResult(HttpRequestMessage+request,+HttpStatusCode+code)+:+this(request,+code,+null)
++++{
++++}

++++public+HttpActionResult(HttpRequestMessage+request,+HttpStatusCode+code,+object+result)
++++{
++++++++Request+=+request;
++++++++Code+=+code;
++++++++Result+=+result;
++++}

++++public+HttpRequestMessage+Request+{+get;+}
++++public+HttpStatusCode+Code+{+get;+}
++++public+object+Result+{+get;+}

++++public+Task<HttpResponseMessage>+ExecuteAsync(CancellationToken+cancellationToken)
++++{
++++++++return+Task.FromResult(Request.CreateResponse(Code,+Result));
++++}
}|code-block|syntax|javascript|568253|然后，您可以向ApiController+(或更好的基本控制器)添加一个方法，如下所示：|568254|protected+IHttpActionResult+CustomResult(HttpStatusCode+code,+object+data)+
{
++++//+Request+here+is+the+property+on+the+controller.
++++return+new+HttpActionResult(Request,+code,+data);
}|568255|然后，您可以像返回任何内置方法一样返回它：|568256|[HttpPost]
public+IHttpActionResult+Post(Model+model)
{
++++return+model.Id+==+1+?
++++++++++++++++Ok()+:
++++++++++++++++CustomResult(HttpStatusCode.NotAcceptable,+new+{+
++++++++++++++++++++data+=+model,+
++++++++++++++++++++error+=+"The+ID+needs+to+be+1."+
++++++++++++++++});
}|568257|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

I don't like having to change my signature to use the HttpCreateResponse type, so I came up with a little bit of an extended solution to hide that.

<pre><code>public class HttpActionResult : IHttpActionResult
{
 public HttpActionResult(HttpRequestMessage request) : this(request, HttpStatusCode.OK)
 {
 }

 public HttpActionResult(HttpRequestMessage request, HttpStatusCode code) : this(request, code, null)
 {
 }

 public HttpActionResult(HttpRequestMessage request, HttpStatusCode code, object result)
 {
 Request = request;
 Code = code;
 Result = result;
 }

 public HttpRequestMessage Request { get; }
 public HttpStatusCode Code { get; }
 public object Result { get; }

 public Task&lt;HttpResponseMessage&gt; ExecuteAsync(CancellationToken cancellationToken)
 {
 return Task.FromResult(Request.CreateResponse(Code, Result));
 }
}
</code></pre>

You can then add a method to your ApiController (or better your base controller) like this:

<pre><code>protected IHttpActionResult CustomResult(HttpStatusCode code, object data) 
{
 // Request here is the property on the controller.
 return new HttpActionResult(Request, code, data);
}
</code></pre>

Then you can return it just like any of the built in methods:

<pre><code>[HttpPost]
public IHttpActionResult Post(Model model)
{
 return model.Id == 1 ?
 Ok() :
 CustomResult(HttpStatusCode.NotAcceptable, new { 
 data = model, 
 error = "The ID needs to be 1." 
 });
}
</code></pre>

blocks|key|352234|text|如果您需要返回一个IHttpActionResult，并希望返回错误代码和一条消息，请使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352235|return+ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.NotModified,+"Error+message+here"));|code-block|syntax|javascript|352236|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|$]]

If you need to return an IHttpActionResult and want to return the error code plus a message, use:

<pre><code>return ResponseMessage(Request.CreateErrorResponse(HttpStatusCode.NotModified, "Error message here"));
</code></pre>

blocks|key|568503|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|568504|return+new+ContentResult()+{+
++++StatusCode+=+404,+
++++Content+=+"Not+found"+
};|code-block|syntax|javascript|568505|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|$]]

Try this :

<pre><code>return new ContentResult() { 
 StatusCode = 404, 
 Content = "Not found" 
};
</code></pre>

blocks|key|352191|text|public+HttpResponseMessage+Post(Article+article)
{
++++HttpResponseMessage+response+=+Request.CreateResponse<Article>(HttpStatusCode.Created,+article);

++++string+uriToTheCreatedItem+=+Url.Route(null,+new+{+id+=+article.Id+});
++++response.Headers.Location+=+new+Uri(Request.RequestUri,+uriToTheCreatedItem);

++++return+response;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|352192|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public HttpResponseMessage Post(Article article)
{
 HttpResponseMessage response = Request.CreateResponse&lt;Article&gt;(HttpStatusCode.Created, article);

 string uriToTheCreatedItem = Url.Route(null, new { id = article.Id });
 response.Headers.Location = new Uri(Request.RequestUri, uriToTheCreatedItem);

 return response;
}
</code></pre>

blocks|key|352512|text|@Aliostads的更新使用了WebAPI2中引入的more+moden+IHttpActionResult。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|352513|https://docs.microsoft.com/en-us/aspnet/web-api/overview/getting-started-with-aspnet-web-api/action-results#ihttpactionresult|352514|public+class+TryController+:+ApiController
{
++++public+IHttpActionResult+GetUser(int+userId,+DateTime+lastModifiedAtClient)
++++{
++++++++var+user+=+new+DataEntities().Users.First(p+=>+p.Id+==+userId);
++++++++if+(user.LastModified+<=+lastModifiedAtClient)
++++++++{
++++++++++++return+StatusCode(HttpStatusCode.NotModified);
++++++++++++//+If+you+would+like+to+return+a+Http+Status+code+with+any+object+instead:
++++++++++++//+return+Content(HttpStatusCode.InternalServerError,+"My+Message");
++++++++}
++++++++return+Ok(user);
++++}
}|code-block|syntax|javascript|352515|entityMap|0|LINK|mutability|MUTABLE|url^0|12|H|0|0|3H|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|G]]]]

An update to @Aliostads answer using the more moden <code>IHttpActionResult</code> introduced in Web API 2.

<a href="https://docs.microsoft.com/en-us/aspnet/web-api/overview/getting-started-with-aspnet-web-api/action-results#ihttpactionresult" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/aspnet/web-api/overview/getting-started-with-aspnet-web-api/action-results#ihttpactionresult</a>

<pre><code>public class TryController : ApiController
{
 public IHttpActionResult GetUser(int userId, DateTime lastModifiedAtClient)
 {
 var user = new DataEntities().Users.First(p =&gt; p.Id == userId);
 if (user.LastModified &lt;= lastModifiedAtClient)
 {
 return StatusCode(HttpStatusCode.NotModified);
 // If you would like to return a Http Status code with any object instead:
 // return Content(HttpStatusCode.InternalServerError, "My Message");
 }
 return Ok(user);
 }
}
</code></pre>

blocks|key|352676|text|我知道这里有几个很好的答案，但这正是我需要的，所以我想我应该添加这段代码，以防其他人需要在webAPI的4.7.x中返回他们想要的任何状态代码和响应体。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|352677|public+class+DuplicateResponseResult<TResponse>+:+IHttpActionResult
{
++++private+TResponse+_response;
++++private+HttpStatusCode+_statusCode;
++++private+HttpRequestMessage+_httpRequestMessage;
++++public+DuplicateResponseResult(HttpRequestMessage+httpRequestMessage,+TResponse+response,+HttpStatusCode+statusCode)
++++{
++++++++_httpRequestMessage+=+httpRequestMessage;
++++++++_response+=+response;
++++++++_statusCode+=+statusCode;
++++}

++++public+Task<HttpResponseMessage>+ExecuteAsync(CancellationToken+cancellationToken)
++++{
++++++++var+response+=+new+HttpResponseMessage(_statusCode);
++++++++return+Task.FromResult(_httpRequestMessage.CreateResponse(_statusCode,+_response));
++++}
}|code-block|syntax|javascript|352678|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 know there are several good answers here but this is what I needed so I figured I'd add this code in case anyone else needs to return whatever status code and response body they wanted in 4.7.x with webAPI.
<pre><code>public class DuplicateResponseResult&lt;TResponse&gt; : IHttpActionResult
{
 private TResponse _response;
 private HttpStatusCode _statusCode;
 private HttpRequestMessage _httpRequestMessage;
 public DuplicateResponseResult(HttpRequestMessage httpRequestMessage, TResponse response, HttpStatusCode statusCode)
 {
 _httpRequestMessage = httpRequestMessage;
 _response = response;
 _statusCode = statusCode;
 }

 public Task&lt;HttpResponseMessage&gt; ExecuteAsync(CancellationToken cancellationToken)
 {
 var response = new HttpResponseMessage(_statusCode);
 return Task.FromResult(_httpRequestMessage.CreateResponse(_statusCode, _response));
 }
}
</code></pre>

I'm trying to return a status code of 304 not modified for a GET method in a web api controller.

The only way I succeeded was something like this:

<pre><code>public class TryController : ApiController
{
 public User GetUser(int userId, DateTime lastModifiedAtClient)
 {
 var user = new DataEntities().Users.First(p =&gt; p.Id == userId);
 if (user.LastModified &lt;= lastModifiedAtClient)
 {
 throw new HttpResponseException(HttpStatusCode.NotModified);
 }
 return user;
 }
}
</code></pre>

The problem here is that it's not an exception, It's just not modified so the client cache is OK.
I also want the return type to be a User (as all the web api examples shows with GET) not return HttpResponseMessage or something like this.

Returning http status code from Web Api controller

我试图为web api控制器中的GET方法返回状态代码304 not modified。我成功的唯一方法是这样的：public class TryController : ApiController{    public User GetUser(int userId, DateTime lastModifiedAtClient)    {        var user = new DataEn

问从Web Api控制器返回http状态代码
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问从Web Api控制器返回http状态代码
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