blocks|key|889668|text|最简单的方法是使用StringContent，它带有JSON对象的JSON表示。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|889669|httpClient.Post(
++++"",
++++new+StringContent(
++++++++myObject.ToString(),
++++++++Encoding.UTF8,
++++++++"application/json"));|code-block|syntax|javascript|889670|entityMap^0|9|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

The easiest way is to use a <code>StringContent</code>, with the JSON representation of your JSON object.

<pre><code>httpClient.Post(
 "",
 new StringContent(
 myObject.ToString(),
 Encoding.UTF8,
 "application/json"));
</code></pre>

blocks|key|672953|text|根据您的.NET版本，您还可以使用HttpClientExtensions.PostAsJsonAsync方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|672954|https://msdn.microsoft.com/en-us/library/system.net.http.httpclientextensions.postasjsonasync.aspx|672955|entityMap|0|LINK|mutability|MUTABLE|url^0|H|10|0|0|2Q|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@$9|S|A|T|1|U]]|E|$]]|$1|H|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|G]]]]

Depending on your .NET version you could also use <code>HttpClientExtensions.PostAsJsonAsync</code> method.

<a href="https://msdn.microsoft.com/en-us/library/system.net.http.httpclientextensions.postasjsonasync.aspx" rel="noreferrer">https://msdn.microsoft.com/en-us/library/system.net.http.httpclientextensions.postasjsonasync.aspx</a>

blocks|key|672993|text|使用新版本的HttpClient，而不使用WebApi包，它将是：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|672994|var+content+=+new+StringContent(jsonObject.ToString(),+Encoding.UTF8,+"application/json");
var+result+=+client.PostAsync(url,+content).Result;|code-block|syntax|javascript|672995|或者如果你想要它async|672996|var+result+=+await+client.PostAsync(url,+content);|672997|entityMap^0|6|A|L|6|0|0|8|5|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|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

With the new version of <code>HttpClient</code> and without the <code>WebApi</code> package it would be:

<pre><code>var content = new StringContent(jsonObject.ToString(), Encoding.UTF8, "application/json");
var result = client.PostAsync(url, content).Result;
</code></pre>

Or if you want it <code>async</code>:

<pre><code>var result = await client.PostAsync(url, content);
</code></pre>

blocks|key|673054|text|如果使用Newtonsoft.Json：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673055|using+Newtonsoft.Json;
using+System.Net.Http;
using+System.Text;

public+static+class+Extensions
{
++++public+static+StringContent+AsJson(this+object+o)
++++++++=>+new+StringContent(JsonConvert.SerializeObject(o),+Encoding.UTF8,+"application/json");
}|code-block|syntax|javascript|673056|示例：|673057|var+httpClient+=+new+HttpClient();
var+url+=+"https://www.duolingo.com/2016-04-13/login?fields=";
var+data+=+new+{+identifier+=+"username",+password+=+"password"+};
var+result+=+await+httpClient.PostAsync(url,+data.AsJson())|673058|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|$]]

If using Newtonsoft.Json:

<pre><code>using Newtonsoft.Json;
using System.Net.Http;
using System.Text;

public static class Extensions
{
 public static StringContent AsJson(this object o)
 =&gt; new StringContent(JsonConvert.SerializeObject(o), Encoding.UTF8, "application/json");
}
</code></pre>

Example:

<pre><code>var httpClient = new HttpClient();
var url = "https://www.duolingo.com/2016-04-13/login?fields=";
var data = new { identifier = "username", password = "password" };
var result = await httpClient.PostAsync(url, data.AsJson())
</code></pre>

blocks|key|889894|text|我没有足够的名气来对pomber的回答添加评论，所以我发布了另一个答案。使用pomber的方法，我不断收到来自API+I+POSTing+my+JSON+request+to+(Visual+Studio2017，.NET+4.6.2)的"400错误请求“响应。最终，问题被追溯到由StringContent()生成的"Content-Type“头是不正确的(参见https://github.com/dotnet/corefx/issues/7864)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|889895|tl;dr|889896|使用pomber的答案并加上一行，以正确设置请求的头部：|889897|var+content+=+new+StringContent(jsonObject.ToString(),+Encoding.UTF8,+"application/json");
content.Headers.ContentType+=+new+MediaTypeHeaderValue("application/json");
var+result+=+client.PostAsync(url,+content).Result;|code-block|syntax|javascript|889898|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/dotnet/corefx/issues/7864^0|52|18|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

I don't have enough reputation to add a comment on the answer from pomber so I'm posting another answer. Using pomber's approach I kept receiving a "400 Bad Request" response from an API I was POSTing my JSON request to (Visual Studio 2017, .NET 4.6.2). Eventually the problem was traced to the "Content-Type" header produced by StringContent() being incorrect (see <a href="https://github.com/dotnet/corefx/issues/7864" rel="noreferrer">https://github.com/dotnet/corefx/issues/7864</a>).

tl;dr

Use pomber's answer with an extra line to correctly set the header on the request:

<pre><code>var content = new StringContent(jsonObject.ToString(), Encoding.UTF8, "application/json");
content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
var result = client.PostAsync(url, content).Result;
</code></pre>

blocks|key|673201|text|vbnet中的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673202|dim+FeToSend+as+new+(object-->+define+class)

Dim+client+As+New+HttpClient
Dim+content+=+New+StringContent(FeToSend.ToString(),+Encoding.UTF8,"application/json")
content.Headers.ContentType+=+New+MediaTypeHeaderValue(+"application/json"+)
Dim+risp+=+client.PostAsync(Chiamata,+content).Result

msgbox(risp.tostring)|code-block|syntax|javascript|673203|希望这对你有所帮助|673204|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|$]]

the code over it in vbnet:

<pre><code>dim FeToSend as new (object--&gt; define class)

Dim client As New HttpClient
Dim content = New StringContent(FeToSend.ToString(), Encoding.UTF8,"application/json")
content.Headers.ContentType = New MediaTypeHeaderValue( "application/json" )
Dim risp = client.PostAsync(Chiamata, content).Result

msgbox(risp.tostring)
</code></pre>

Hope this help

blocks|key|673230|text|谢谢你，庞贝，但是为了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|673231|var+result+=+client.PostAsync(url,+content).Result;|code-block|syntax|javascript|673232|我用过|673233|var+result+=+await+client.PostAsync(url,+content);|673234|因为结果使高请求的应用程序锁定|673235|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Thank you pomber but for
<pre><code>var result = client.PostAsync(url, content).Result;
</code></pre>
I used
<pre><code>var result = await client.PostAsync(url, content);
</code></pre>
because Result makes app lock for high request

I'm trying to POST a <code>JsonObject</code> using <code>HttpClient</code> from Web API. I'm not quite sure how to go about this and can't find much in the way of sample code. 

Here's what I have so far:

<pre><code>var myObject = (dynamic)new JsonObject();
myObject.Data = "some data";
myObject.Data2 = "some more data";

HttpClient httpClient = new HttpClient("myurl");
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

HttpResponseMessage response = httpClient.Post("", ???);
</code></pre>

I think I need to cast my <code>JsonObject</code> as a <code>StreamContent</code> but I'm getting hung up on that step.

POSTing JsonObject With HttpClient From Web API

Visual Studio

JSON

我正在尝试使用Web中的HttpClient发布一个JsonObject。我不太确定该怎么做，在示例代码中也找不到太多。这是我到目前为止所知道的：var myObject = (dynamic)new JsonObject();myObject.Data = "some data";myObject.Data2 = "...

问POSTing JsonObject与来自网络应用编程接口的HttpClient
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