blocks|key|468694|text|如果您只想对一个方法执行此操作，则将您的方法声明为返回HttpResponseMessage而不是IEnumerable<Whatever>，并执行以下操作：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|468695|++++public+HttpResponseMessage+GetAllWhatever()
++++{
++++++++return+Request.CreateResponse(HttpStatusCode.OK,+new+List<Whatever>(),+Configuration.Formatters.JsonFormatter);
++++}|code-block|syntax|javascript|468696|这段代码对单元测试来说很痛苦，但也有可能是这样的：|468697|++++sut+=+new+WhateverController()+{+Configuration+=+new+HttpConfiguration()+};
++++sut.Configuration.Formatters.Add(new+Mock<JsonMediaTypeFormatter>().Object);
++++sut.Request+=+new+HttpRequestMessage();|468698|entityMap^0|R|J|1D|L|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|$]]

If you want to do that for one method only, then declare your method as returning <code>HttpResponseMessage</code> instead of <code>IEnumerable&lt;Whatever&gt;</code> and do:

<pre><code> public HttpResponseMessage GetAllWhatever()
 {
 return Request.CreateResponse(HttpStatusCode.OK, new List&lt;Whatever&gt;(), Configuration.Formatters.JsonFormatter);
 }
</code></pre>

this code is pain for unit testing but that's also possible like this:

<pre><code> sut = new WhateverController() { Configuration = new HttpConfiguration() };
 sut.Configuration.Formatters.Add(new Mock&lt;JsonMediaTypeFormatter&gt;().Object);
 sut.Request = new HttpRequestMessage();
</code></pre>

blocks|key|251970|text|受Dmitry+Pavlov的出色回答的启发，我对其进行了稍微的修改，以便可以插入任何我想要强制执行的格式化程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|251971|归功于Dmitry。|251972|///+<summary>
///+A+ContentNegotiator+implementation+that+does+not+negotiate.+Inspired+by+the+film+Taken.
///+</summary>
internal+sealed+class+LiamNeesonContentNegotiator+:+IContentNegotiator
{
++++private+readonly+MediaTypeFormatter+_formatter;
++++private+readonly+string+_mimeTypeId;

++++public+LiamNeesonContentNegotiator(MediaTypeFormatter+formatter,+string+mimeTypeId)
++++{
++++++++if+(formatter+==+null)
++++++++++++throw+new+ArgumentNullException("formatter");

++++++++if+(String.IsNullOrWhiteSpace(mimeTypeId))
++++++++++++throw+new+ArgumentException("Mime+type+identifier+string+is+null+or+whitespace.");

++++++++_formatter+=+formatter;
++++++++_mimeTypeId+=+mimeTypeId.Trim();
++++}

++++public+ContentNegotiationResult+Negotiate(Type+type,+HttpRequestMessage+request,+IEnumerable<MediaTypeFormatter>+formatters)
++++{
++++++++return+new+ContentNegotiationResult(_formatter,+new+MediaTypeHeaderValue(_mimeTypeId));
++++}
}|code-block|syntax|javascript|251973|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Inspired by Dmitry Pavlov's excellent answer, I altered it slightly so I could plug-in whatever formatter I wanted to enforce.

Credit to Dmitry.

<pre><code>/// &lt;summary&gt;
/// A ContentNegotiator implementation that does not negotiate. Inspired by the film Taken.
/// &lt;/summary&gt;
internal sealed class LiamNeesonContentNegotiator : IContentNegotiator
{
 private readonly MediaTypeFormatter _formatter;
 private readonly string _mimeTypeId;

 public LiamNeesonContentNegotiator(MediaTypeFormatter formatter, string mimeTypeId)
 {
 if (formatter == null)
 throw new ArgumentNullException("formatter");

 if (String.IsNullOrWhiteSpace(mimeTypeId))
 throw new ArgumentException("Mime type identifier string is null or whitespace.");

 _formatter = formatter;
 _mimeTypeId = mimeTypeId.Trim();
 }

 public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable&lt;MediaTypeFormatter&gt; formatters)
 {
 return new ContentNegotiationResult(_formatter, new MediaTypeHeaderValue(_mimeTypeId));
 }
}
</code></pre>

blocks|key|468765|text|Philip+W有正确的答案，但为了清晰和完整的解决方案，编辑您的Global.asax.cs文件如下所示：(请注意，我必须将引用System.Net.Http.Formatting添加到股票生成的文件中)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|468766|using+System;
using+System.Collections.Generic;
using+System.Linq;
using+System.Net.Http.Formatting;
using+System.Web;
using+System.Web.Http;
using+System.Web.Mvc;
using+System.Web.Optimization;
using+System.Web.Routing;

namespace+BoomInteractive.TrainerCentral.Server+{
++++//+Note:+For+instructions+on+enabling+IIS6+or+IIS7+classic+mode,+
++++//+visit+http://go.microsoft.com/?LinkId=9394801

++++public+class+WebApiApplication+:+System.Web.HttpApplication+{
++++++++protected+void+Application_Start()+{
++++++++++++AreaRegistration.RegisterAllAreas();

++++++++++++WebApiConfig.Register(GlobalConfiguration.Configuration);
++++++++++++FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
++++++++++++RouteConfig.RegisterRoutes(RouteTable.Routes);
++++++++++++BundleConfig.RegisterBundles(BundleTable.Bundles);

++++++++++++//Force+JSON+responses+on+all+requests
++++++++++++GlobalConfiguration.Configuration.Formatters.Clear();
++++++++++++GlobalConfiguration.Configuration.Formatters.Add(new+JsonMediaTypeFormatter());
++++++++}
++++}
}|code-block|syntax|javascript|468767|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|$]]

Philip W had the right answer but for clarity and a complete working solution, edit your Global.asax.cs file to look like this: (Notice I had to add the reference System.Net.Http.Formatting to the stock generated file)

<pre><code>using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Formatting;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace BoomInteractive.TrainerCentral.Server {
 // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
 // visit http://go.microsoft.com/?LinkId=9394801

 public class WebApiApplication : System.Web.HttpApplication {
 protected void Application_Start() {
 AreaRegistration.RegisterAllAreas();

 WebApiConfig.Register(GlobalConfiguration.Configuration);
 FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
 RouteConfig.RegisterRoutes(RouteTable.Routes);
 BundleConfig.RegisterBundles(BundleTable.Bundles);

 //Force JSON responses on all requests
 GlobalConfiguration.Configuration.Formatters.Clear();
 GlobalConfiguration.Configuration.Formatters.Add(new JsonMediaTypeFormatter());
 }
 }
}
</code></pre>

blocks|key|468805|text|GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|468806|这将清除XML格式化程序，因此默认使用JSON格式。|unstyled|468807|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();
</code></pre>

This clears the XML formatter and thus defaulting to JSON format.

blocks|key|468824|text|Yo可以在WebApiConfig.cs中使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|468825|config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new+MediaTypeHeaderValue("text/html"));|code-block|syntax|javascript|468826|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|$]]

Yo can use in WebApiConfig.cs:

<pre><code>config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
</code></pre>

blocks|key|468861|text|这设置了正确的标头。看起来更优雅一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|468862|public+JsonResult<string>+TestMethod()+
{
return+Json("your+string+or+object");
}|code-block|syntax|javascript|468863|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|$]]

This has correct headers set. Seems a bit more elegant.

<pre><code>public JsonResult&lt;string&gt; TestMethod() 
{
return Json("your string or object");
}
</code></pre>

blocks|key|252114|text|适用于使用OWIN的用户|type|unstyled|depth|inlineStyleRanges|entityRanges|data|252115|GlobalConfiguration.Configuration.Formatters.Clear();
GlobalConfiguration.Configuration.Formatters.Add(new+JsonMediaTypeFormatter());|code-block|syntax|javascript|252116|变成(在Startup.cs中)：|252117|+++public+void+Configuration(IAppBuilder+app)
++++++++{
++++++++++++OwinConfiguration+=+new+HttpConfiguration();
++++++++++++ConfigureOAuth(app);

++++++++++++OwinConfiguration.Formatters.Clear();
++++++++++++OwinConfiguration.Formatters.Add(new+DynamicJsonMediaTypeFormatter());

++++++++++++[...]
++++++++}|252118|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|$]]

for those using OWIN

<pre><code>GlobalConfiguration.Configuration.Formatters.Clear();
GlobalConfiguration.Configuration.Formatters.Add(new JsonMediaTypeFormatter());
</code></pre>

becomes (in Startup.cs):

<pre><code> public void Configuration(IAppBuilder app)
 {
 OwinConfiguration = new HttpConfiguration();
 ConfigureOAuth(app);

 OwinConfiguration.Formatters.Clear();
 OwinConfiguration.Formatters.Add(new DynamicJsonMediaTypeFormatter());

 [...]
 }
</code></pre>

blocks|key|468909|text|+public+System.Web.Http.Results.JsonResult<MeineObjekt>+Get()
++++{
++++++++return+Json(new+MeineObjekt()
++++++++{
++++++++++++Cod+=+"C4666",+++++++++++++++
++++++++++++Payment+=+10.0m,
++++++++++++isEnough+=+false
++++++++});
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|468910|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 System.Web.Http.Results.JsonResult&lt;MeineObjekt&gt; Get()
 {
 return Json(new MeineObjekt()
 {
 Cod = &quot;C4666&quot;, 
 Payment = 10.0m,
 isEnough = false
 });
 }
</code></pre>

ASP.NET Web API does content negotiation by default - will return XML or JSON or other type based on the <code>Accept</code> header. I don't need / want this, is there a way (like an attribute or something) to tell Web API to always return JSON?

How to force ASP.NET Web API to always return JSON?

单元测试

JSON

XML默认执行内容协商-将基于Accept标头返回ASP.NET或JSON或其他类型。我不需要/不想要这个，有没有办法(像属性之类的)告诉Web API总是返回JSON？

问如何强制JSON总是返回ASP.NET？
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