我正在尝试使用HttpContent:
HttpContent myContent = HttpContent.Create(SOME_JSON);
.．.但是我没有找到它定义的DLL。
首先，我尝试添加对微软的引用。Http和系统。Net，但都不在列表中。我还尝试添加对System.Net.Http的引用，但HttpContent类不可用。
有人能告诉我在哪能找到HttpContent类吗?
当前回答
对于JSON Post:
var stringContent = new StringContent(json, Encoding.UTF8, "application/json");
var response = await httpClient.PostAsync("http://www.sample.com/write", stringContent);
Non-JSON:
var stringContent = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("field1", "value1"),
new KeyValuePair<string, string>("field2", "value2"),
});
var response = await httpClient.PostAsync("http://www.sample.com/write", stringContent);
https://blog.pedrofelix.org/2012/01/16/the-new-system-net-http-classes-message-content/
其他回答
虽然最终版本的HttpContent和整个System.Net.Http命名空间将随.NET 4.5而来，但您可以通过从NuGet中添加Microsoft.Net.Http包来使用.NET 4版本
要获取6footunder的注释并将其转换为答案，HttpContent是抽象的，所以你需要使用一个派生类:
只使用……
var stringContent = new StringContent(jObject.ToString());
var response = await httpClient.PostAsync("http://www.sample.com/write", stringContent);
Or,
var stringContent = new StringContent(JsonConvert.SerializeObject(model), Encoding.UTF8, "application/json");
var response = await httpClient.PostAsync("http://www.sample.com/write", stringContent);
我非常确定代码没有使用System.Net.Http.HttpContent类，而是使用Microsoft.Http.HttpContent。 微软。Http是WCF REST入门套件，它在被放入。net框架之前从未发布过预览版。 你仍然可以在这里找到它:http://aspnet.codeplex.com/releases/view/24644
我不建议在此基础上编写新代码。
对于JSON Post:
var stringContent = new StringContent(json, Encoding.UTF8, "application/json");
var response = await httpClient.PostAsync("http://www.sample.com/write", stringContent);
Non-JSON:
var stringContent = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("field1", "value1"),
new KeyValuePair<string, string>("field2", "value2"),
});
var response = await httpClient.PostAsync("http://www.sample.com/write", stringContent);
https://blog.pedrofelix.org/2012/01/16/the-new-system-net-http-classes-message-content/
