blocks|key|298341|text|如果您特别想只返回JSON，而不使用WebAPI特性(如允许XML)，则始终可以直接写入输出。假设您使用ASP.NET托管此对象，您可以访问Response对象，因此可以将其作为字符串写入，然后您实际上不需要从您的方法返回任何内容-您已经将响应文本写入了输出流。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|298342|entityMap^0|1Y|8|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 specifically want to return that JSON only, without using WebAPI features (like allowing XML), you can always write directly to the output. Assuming you're hosting this with ASP.NET, you have access to the <code>Response</code> object, so you can write it out that way as a string, then you don't need to actually return anything from your method - you've already written the response text to the output stream.

blocks|key|81181|text|有几种选择。最简单的方法是让您的方法返回一个HttpResponseMessage，并使用基于您的字符串的StringContent创建该响应，类似于以下代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|81182|public+HttpResponseMessage+Get()
{
++++string+yourJson+=+GetJsonFromSomewhere();
++++var+response+=+this.Request.CreateResponse(HttpStatusCode.OK);
++++response.Content+=+new+StringContent(yourJson,+Encoding.UTF8,+"application/json");
++++return+response;
}|code-block|syntax|javascript|81183|并检查null或空JSON字符串|81184|public+HttpResponseMessage+Get()
{
++++string+yourJson+=+GetJsonFromSomewhere();
++++if+(!string.IsNullOrEmpty(yourJson))
++++{
++++++++var+response+=+this.Request.CreateResponse(HttpStatusCode.OK);
++++++++response.Content+=+new+StringContent(yourJson,+Encoding.UTF8,+"application/json");
++++++++return+response;
++++}
++++throw+new+HttpResponseException(HttpStatusCode.NotFound);
}|81185|entityMap^0|M|J|1H|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

There are a few alternatives. The simplest one is to have your method return a <code>HttpResponseMessage</code>, and create that response with a <code>StringContent</code> based on your string, something similar to the code below:

<pre><code>public HttpResponseMessage Get()
{
 string yourJson = GetJsonFromSomewhere();
 var response = this.Request.CreateResponse(HttpStatusCode.OK);
 response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json");
 return response;
}
</code></pre>

And checking null or empty JSON string

<pre><code>public HttpResponseMessage Get()
{
 string yourJson = GetJsonFromSomewhere();
 if (!string.IsNullOrEmpty(yourJson))
 {
 var response = this.Request.CreateResponse(HttpStatusCode.OK);
 response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json");
 return response;
 }
 throw new HttpResponseException(HttpStatusCode.NotFound);
}
</code></pre>

blocks|key|298411|text|以下是@carlosfigueira的解决方案，适用于使用WebApi2引入的IHttpActionResult接口：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|298412|public+IHttpActionResult+Get()
{
++++string+yourJson+=+GetJsonFromSomewhere();
++++if+(string.IsNullOrEmpty(yourJson)){
++++++++return+NotFound();
++++}
++++var+response+=+this.Request.CreateResponse(HttpStatusCode.OK);
++++response.Content+=+new+StringContent(yourJson,+Encoding.UTF8,+"application/json");
++++return+ResponseMessage(response);
}|code-block|syntax|javascript|298413|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|$]]

Here is @carlosfigueira's solution adapted to use the IHttpActionResult Interface that was introduced with WebApi2:

<pre><code>public IHttpActionResult Get()
{
 string yourJson = GetJsonFromSomewhere();
 if (string.IsNullOrEmpty(yourJson)){
 return NotFound();
 }
 var response = this.Request.CreateResponse(HttpStatusCode.OK);
 response.Content = new StringContent(yourJson, Encoding.UTF8, "application/json");
 return ResponseMessage(response);
}
</code></pre>

blocks|key|81251|text|从web+api+GET方法返回json数据的示例|type|unstyled|depth|inlineStyleRanges|entityRanges|data|81252|[HttpGet]
public+IActionResult+Get()
{
++++++++++++return+Content("{\"firstName\":+\"John\",++\"lastName\":+\"Doe\",+\"lastUpdateTimeStamp\":+\"2018-07-30T18:25:43.511Z\",++\"nextUpdateTimeStamp\":+\"2018-08-30T18:25:43.511Z\");
}|code-block|syntax|javascript|81253|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|$]]

sample example to return json data from web api GET method

<pre><code>[HttpGet]
public IActionResult Get()
{
 return Content("{\"firstName\": \"John\", \"lastName\": \"Doe\", \"lastUpdateTimeStamp\": \"2018-07-30T18:25:43.511Z\", \"nextUpdateTimeStamp\": \"2018-08-30T18:25:43.511Z\");
}
</code></pre>

blocks|key|81276|text|这些也是有效的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|81277|[HttpGet]
[Route("RequestXXX")]
public+ActionResult+RequestXXX()
{
++++string+error+=+"";
++++try{
++++++++_session.RequestXXX();
++++}
++++catch(Exception+e)
++++{
++++++++error+=+e.Message;
++++}
++++return+new+JsonResult(new+{+error=error,+explanation="An+error+happened"});
}

[HttpGet]
[Route("RequestXXX")]
public+ActionResult+RequestXXX()
{
++++string+error+=+"";
++++try{
++++++++_session.RequestXXX();
++++}
++++catch(Exception+e)
++++{
++++++++error+=+e.Message;
++++}
++++return+new+JsonResult(error);
}|code-block|syntax|javascript|81278|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|$]]

these also work:

<pre><code>[HttpGet]
[Route("RequestXXX")]
public ActionResult RequestXXX()
{
 string error = "";
 try{
 _session.RequestXXX();
 }
 catch(Exception e)
 {
 error = e.Message;
 }
 return new JsonResult(new { error=error, explanation="An error happened"});
}

[HttpGet]
[Route("RequestXXX")]
public ActionResult RequestXXX()
{
 string error = "";
 try{
 _session.RequestXXX();
 }
 catch(Exception e)
 {
 error = e.Message;
 }
 return new JsonResult(error);
}
</code></pre>

blocks|key|298516|text|这适用于我在.NET核心3.1中的工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|298517|private+async+Task<ContentResult>+ChannelCosmicRaysAsync(HttpRequestMessage+request)
{
++++//+client+is+HttpClient
++++using+var+response+=+await+client.SendAsync(request).ConfigureAwait(false);+

++++var+responseContentString+=+await+response.Content.ReadAsStringAsync().ConfigureAwait(false);

++++Response.StatusCode+=+(int)response.StatusCode;
++++return+Content(responseContentString,+"application/json");
}|code-block|syntax|javascript|298518|public+Task<ContentResult>+X()
{
++++var+request+=+new+HttpRequestMessage(HttpMethod.Post,+url);
++++(...)

++++return+ChannelCosmicRaysAsync(request);
}|298519|ContentResult是Microsoft.AspNetCore.Mvc.ContentResult。|offset|length|style|CODE|298520|请注意，这不是频道标题，但在我的情况下，这是我需要的。|298521|entityMap^0|0|0|0|0|D|E|12|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]|$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

This works for me in .NET Core 3.1.
<pre class="lang-cs prettyprint-override"><code>private async Task&lt;ContentResult&gt; ChannelCosmicRaysAsync(HttpRequestMessage request)
{
 // client is HttpClient
 using var response = await client.SendAsync(request).ConfigureAwait(false); 

 var responseContentString = await response.Content.ReadAsStringAsync().ConfigureAwait(false);

 Response.StatusCode = (int)response.StatusCode;
 return Content(responseContentString, &quot;application/json&quot;);
}
</code></pre>
<pre><code>public Task&lt;ContentResult&gt; X()
{
 var request = new HttpRequestMessage(HttpMethod.Post, url);
 (...)

 return ChannelCosmicRaysAsync(request);
}
</code></pre>
<code>ContentResult</code> is <code>Microsoft.AspNetCore.Mvc.ContentResult</code>.
Please note this doesn't channel headers, but in my case this is what I need.

blocks|key|298553|text|如果您的控制器方法返回一个IActionResult，您可以通过手动设置输出格式化程序来实现。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|298554|//+Alternatively,+if+inheriting+from+ControllerBase+you+could+do
//+var+result+=+Ok(jsonAsString);
var+result+=+new+OkObjectResult(jsonAsString);

var+formatter+=+new+StringOutputFormatter();
result.Formatters.Add(formatter);

formatter.SupportedMediaTypes.Clear();
formatter.SupportedMediaTypes.Add("application/json");|code-block|syntax|javascript|298555|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 your controller method returns an IActionResult you can achieve this by manually setting the output formatter.
<pre><code>// Alternatively, if inheriting from ControllerBase you could do
// var result = Ok(jsonAsString);
var result = new OkObjectResult(jsonAsString);

var formatter = new StringOutputFormatter();
result.Formatters.Add(formatter);

formatter.SupportedMediaTypes.Clear();
formatter.SupportedMediaTypes.Add(&quot;application/json&quot;);
</code></pre>

In Some cases I have NewtonSoft JSON.NET and in my controller I just return the Jobject from my controller and all is good.

But I have a case where I get some raw JSON from another service and need to return it from my webAPI. In this context I can't use NewtonSOft, but if I could then I'd create a JOBJECT from the string (which seems like unneeded processing overhead) and return that and all would be well with the world.

However, I want to return this simply, but if I return the string, then the client receives a JSON wrapper with my context as an encoded string.

How can I explicitly return a JSON from my WebAPI controller method?

Return a JSON string explicitly from Asp.net WEBAPI?

JSON

在某些情况下，我有NewtonSoft JSON.NET，在我的控制器中，我只需从我的控制器返回Jobject，一切都是正常的。但是我有一个案例，我从另一个服务获得一些原始的JSON，并且需要从我的webAPI返回它。在这种情况下，我不能使用NewtonSOft，但如果可以的话，我会从字符串创建一个JOBJECT (这...

问从Asp.net WEBAPI显式返回JSON字符串？
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