我试图从Web API使用HttpClient POST一个JsonObject。我不太确定如何做到这一点，也找不到很多样例代码。
以下是我目前所了解到的:
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("", ???);
我认为我需要将我的JsonObject转换为StreamContent，但我在这一步上被挂断了。
当前回答
最简单的方法是使用StringContent，使用JSON对象的JSON表示形式。
httpClient.Post(
"",
new StringContent(
myObject.ToString(),
Encoding.UTF8,
"application/json"));
其他回答
如果使用Newtonsoft。Json:
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");
}
例子:
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())
在没有WebApi包的情况下，新版本的HttpClient将会是:
var content = new StringContent(jsonObject.ToString(), Encoding.UTF8, "application/json");
var result = client.PostAsync(url, content).Result;
或者如果你想异步:
var result = await client.PostAsync(url, content);
上面的代码在vbnet:
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)
希望这对你有所帮助
我花了好几个小时才解出来。 但是@anthls anwser救了我的命。
var data = new StringContent(JsonConvert.SerializeObject(new
{
abc = "jsjs",
xyz = "hhhh"
}));
data.Headers.ContentType = new MediaTypeHeaderValue("application/json"); // <--
var response = await client.PostAsync(url, data);
我也遇到过同样的问题
var content = new StringContent(jsonObject.ToString(), Encoding.UTF8, "application/json");
gave
“400个坏请求”
单独序列化JsonObject并在StringContent()中传递字符串解决了我的问题，不需要设置Encoding。use UTF8分开。
