blocks|key|157125|text|我发现自己使用HttpClient库来查询RESTful+API，因为代码非常简单且完全异步。要发送此JSON有效负载：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|157126|{
++"agent":+{+++++++++++++++++++++++++++++
++++"name":+"Agent+Name",++++++++++++++++
++++"version":+1++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++},
++"username":+"Username",+++++++++++++++++++++++++++++++++++
++"password":+"User+Password",
++"token":+"xxxxxx"
}|code-block|syntax|javascript|157127|有两个类表示您发布的JSON结构，可能如下所示：|157128|public+class+Credentials
{
++++public+Agent+Agent+{+get;+set;+}
++++
++++public+string+Username+{+get;+set;+}
++++
++++public+string+Password+{+get;+set;+}
++++
++++public+string+Token+{+get;+set;+}
}

public+class+Agent
{
++++public+string+Name+{+get;+set;+}
++++
++++public+int+Version+{+get;+set;+}
}|157129|你可以有一个像这样的方法，它将完成你的POST请求：|157130|var+payload+=+new+Credentials+{+
++++Agent+=+new+Agent+{+
++++++++Name+=+"Agent+Name",
++++++++Version+=+1+
++++},
++++Username+=+"Username",
++++Password+=+"User+Password",
++++Token+=+"xxxxx"
};

//+Serialize+our+concrete+class+into+a+JSON+String
var+stringPayload+=+JsonConvert.SerializeObject(payload);

//+Wrap+our+JSON+inside+a+StringContent+which+then+can+be+used+by+the+HttpClient+class
var+httpContent+=+new+StringContent(stringPayload,+Encoding.UTF8,+"application/json");

var+httpClient+=+new+HttpClient()
++++
//+Do+the+actual+request+and+await+the+response
var+httpResponse+=+await+httpClient.PostAsync("http://localhost/api/path",+httpContent);

//+If+the+response+contains+content+we+want+to+read+it!
if+(httpResponse.Content+!=+null)+{
++++var+responseContent+=+await+httpResponse.Content.ReadAsStringAsync();
++++
++++//+From+here+on+you+could+deserialize+the+ResponseContent+back+again+to+a+concrete+C#+type+using+Json.Net
}|157131|entityMap|0|LINK|mutability|MUTABLE|url|https://www.nuget.org/packages/Microsoft.Net.Http/^0|7|A|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|C|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

I found myself using the <a href="https://www.nuget.org/packages/Microsoft.Net.Http/" rel="noreferrer">HttpClient</a> library to query RESTful APIs as the code is very straightforward and fully async'ed. To send this JSON payload:
<pre><code>{
 &quot;agent&quot;: { 
 &quot;name&quot;: &quot;Agent Name&quot;, 
 &quot;version&quot;: 1 
 },
 &quot;username&quot;: &quot;Username&quot;, 
 &quot;password&quot;: &quot;User Password&quot;,
 &quot;token&quot;: &quot;xxxxxx&quot;
}
</code></pre>
With two classes representing the JSON structure you posted that may look like this:

<pre class="lang-cs prettyprint-override"><code>public class Credentials
{
 public Agent Agent { get; set; }
 
 public string Username { get; set; }
 
 public string Password { get; set; }
 
 public string Token { get; set; }
}

public class Agent
{
 public string Name { get; set; }
 
 public int Version { get; set; }
}
</code></pre>
You could have a method like this, which would do your POST request:
<pre class="lang-cs prettyprint-override"><code>var payload = new Credentials { 
 Agent = new Agent { 
 Name = &quot;Agent Name&quot;,
 Version = 1 
 },
 Username = &quot;Username&quot;,
 Password = &quot;User Password&quot;,
 Token = &quot;xxxxx&quot;
};

// Serialize our concrete class into a JSON String
var stringPayload = JsonConvert.SerializeObject(payload);

// Wrap our JSON inside a StringContent which then can be used by the HttpClient class
var httpContent = new StringContent(stringPayload, Encoding.UTF8, &quot;application/json&quot;);

var httpClient = new HttpClient()
 
// Do the actual request and await the response
var httpResponse = await httpClient.PostAsync(&quot;http://localhost/api/path&quot;, httpContent);

// If the response contains content we want to read it!
if (httpResponse.Content != null) {
 var responseContent = await httpResponse.Content.ReadAsStringAsync();
 
 // From here on you could deserialize the ResponseContent back again to a concrete C# type using Json.Net
}
</code></pre>

blocks|key|156009|text|您可以使用JObject和JProperty的组合来构建HttpContent，然后在构建StringContent时对其调用ToString()|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|156010|++++++++/*{
++++++++++"agent":+{+++++++++++++++++++++++++++++
++++++++++++"name":+"Agent+Name",++++++++++++++++
++++++++++++"version":+1++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++},
++++++++++"username":+"Username",+++++++++++++++++++++++++++++++++++
++++++++++"password":+"User+Password",
++++++++++"token":+"xxxxxx"
++++++++}*/

++++++++JObject+payLoad+=+new+JObject(
++++++++++++new+JProperty("agent",+
++++++++++++++++new+JObject(
++++++++++++++++++++new+JProperty("name",+"Agent+Name"),
++++++++++++++++++++new+JProperty("version",+1)
++++++++++++++++++++),
++++++++++++++++new+JProperty("username",+"Username"),
++++++++++++++++new+JProperty("password",+"User+Password"),
++++++++++++++++new+JProperty("token",+"xxxxxx")++++
++++++++++++++++)
++++++++++++);

++++++++using+(HttpClient+client+=+new+HttpClient())
++++++++{
++++++++++++var+httpContent+=+new+StringContent(payLoad.ToString(),+Encoding.UTF8,+"application/json");

++++++++++++using+(HttpResponseMessage+response+=+await+client.PostAsync(requestUri,+httpContent))
++++++++++++{
++++++++++++++++response.EnsureSuccessStatusCode();
++++++++++++++++string+responseBody+=+await+response.Content.ReadAsStringAsync();
++++++++++++++++return+JObject.Parse(responseBody);
++++++++++++}
++++++++}|code-block|syntax|javascript|156011|entityMap^0|5|7|D|9|S|B|19|D|1R|A|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|L|$]]

You can build your <code>HttpContent</code> using the combination of <code>JObject</code> to avoid and <code>JProperty</code> and then call <code>ToString()</code> on it when building the <code>StringContent</code>:

<pre><code> /*{
 "agent": { 
 "name": "Agent Name", 
 "version": 1 
 },
 "username": "Username", 
 "password": "User Password",
 "token": "xxxxxx"
 }*/

 JObject payLoad = new JObject(
 new JProperty("agent", 
 new JObject(
 new JProperty("name", "Agent Name"),
 new JProperty("version", 1)
 ),
 new JProperty("username", "Username"),
 new JProperty("password", "User Password"),
 new JProperty("token", "xxxxxx") 
 )
 );

 using (HttpClient client = new HttpClient())
 {
 var httpContent = new StringContent(payLoad.ToString(), Encoding.UTF8, "application/json");

 using (HttpResponseMessage response = await client.PostAsync(requestUri, httpContent))
 {
 response.EnsureSuccessStatusCode();
 string responseBody = await response.Content.ReadAsStringAsync();
 return JObject.Parse(responseBody);
 }
 }
</code></pre>

blocks|key|156013|text|使用JSON.NET+NuGet包和匿名类型，您可以简化其他发布者的建议：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|156014|//+...

string+payload+=+JsonConvert.SerializeObject(new
{
++++agent+=+new
++++{
++++++++name++++=+"Agent+Name",
++++++++version+=+1,
++++},

++++username+=+"username",
++++password+=+"password",
++++token++++=+"xxxxx",
});

var+client+=+new+HttpClient();
var+content+=+new+StringContent(payload,+Encoding.UTF8,+"application/json");

HttpResponseMessage+response+=+await+client.PostAsync(uri,+content);

//+...|code-block|syntax|javascript|156015|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|$]]

Using the JSON.NET NuGet package and anonymous types, you can simplify what the other posters are suggesting:

<pre><code>// ...

string payload = JsonConvert.SerializeObject(new
{
 agent = new
 {
 name = "Agent Name",
 version = 1,
 },

 username = "username",
 password = "password",
 token = "xxxxx",
});

var client = new HttpClient();
var content = new StringContent(payload, Encoding.UTF8, "application/json");

HttpResponseMessage response = await client.PostAsync(uri, content);

// ...
</code></pre>

blocks|key|158505|text|还可以使用HttpClient()中提供的PostAsJsonAsync()方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|158506|var+requestObj=+JsonConvert.SerializeObject(obj);
HttpResponseMessage+response+=+await+client.PostAsJsonAsync($"endpoint",requestObj);|code-block|syntax|javascript|158507|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 use the PostAsJsonAsync() method available in HttpClient()
<pre class="lang-cs prettyprint-override"><code>var requestObj= JsonConvert.SerializeObject(obj);
HttpResponseMessage response = await client.PostAsJsonAsync($&quot;endpoint&quot;,requestObj);
</code></pre>

This is my first time ever using JSON as well as <code>System.Net</code> and the <code>WebRequest</code> in any of my applications. My application is supposed to send a JSON payload, similar to the one below to an authentication server:

<pre><code>{
 "agent": { 
 "name": "Agent Name", 
 "version": 1 
 },
 "username": "Username", 
 "password": "User Password",
 "token": "xxxxxx"
}
</code></pre>

To create this payload, I used the <code>JSON.NET</code> library. How would I send this data to the authentication server and receive its JSON response back? Here is what I have seen in some examples, but no JSON content:

<pre><code>var http = (HttpWebRequest)WebRequest.Create(new Uri(baseUrl));
http.Accept = "application/json";
http.ContentType = "application/json";
http.Method = "POST";

string parsedContent = "Parsed JSON Content needs to go here";
ASCIIEncoding encoding = new ASCIIEncoding();
Byte[] bytes = encoding.GetBytes(parsedContent);

Stream newStream = http.GetRequestStream();
newStream.Write(bytes, 0, bytes.Length);
newStream.Close();

var response = http.GetResponse();

var stream = response.GetResponseStream();
var sr = new StreamReader(stream);
var content = sr.ReadToEnd();
</code></pre>

However, this seems to be a lot of code compaired to using other languages I have used in the past. Am I doing this correctly? And how would I get the JSON response back so I can parse it?

Thanks, Elite.

Updated Code

<pre><code>// Send the POST Request to the Authentication Server
// Error Here
string json = await Task.Run(() =&gt; JsonConvert.SerializeObject(createLoginPayload(usernameTextBox.Text, password)));
var httpContent = new StringContent(json, Encoding.UTF8, "application/json");
using (var httpClient = new HttpClient())
{
 // Error here
 var httpResponse = await httpClient.PostAsync("URL HERE", httpContent);
 if (httpResponse.Content != null)
 {
 // Error Here
 var responseContent = await httpResponse.Content.ReadAsStringAsync();
 }
}
</code></pre>

Send JSON via POST in C# and Receive the JSON returned?

身份验证

RESTful API

服务器

JSON

这是我第一次在我的应用程序中使用JSON、System.Net和WebRequest。我的应用程序应该向身份验证服务器发送一个JSON有效负载，类似于下面的负载：{  "agent": {                                 "name": "Agent Name",            ...

问在C#中通过POST发送JSON并接收返回的JSON？
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问在C#中通过POST发送JSON并接收返回的JSON？
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