如何从 Httpclient.SendAsync 调用获取并打印响应

Question

我正在尝试从 HTTP 请求获取响应，但我似乎无法做到。我尝试过以下方法：

public Form1() {     

    HttpClient client = new HttpClient();
    client.BaseAddress = new Uri("someUrl");
    string content = "someJsonString";
    HttpRequestMessage sendRequest = new HttpRequestMessage(HttpMethod.Post, client.BaseAddress);
    sendRequest.Content = new StringContent(content,
                                            Encoding.UTF8,
                                            "application/json");

发送消息：

    ...
    client.SendAsync(sendRequest).ContinueWith(responseTask =>
    {
        Console.WriteLine("Response: {0}", responseTask.Result);
    });
} // end public Form1()

使用此代码，我取回状态代码和一些标头信息，但我没有取回响应本身。我也尝试过：

  HttpResponseMessage response = await client.SendAsync(sendRequest);

但随后我被告知创建一个如下所示的异步方法以使其正常工作

private async Task<string> send(HttpClient client, HttpRequestMessage msg)
{
    HttpResponseMessage response = await client.SendAsync(msg);
    string rep = await response.Content.ReadAsStringAsync();
}

这是发送“HttpRequest”、获取并打印响应的首选方式吗？我不确定哪种方法是正确的。

Answer 1

这是一种使用

HttpClient

的方法，这应该读取请求的响应，以防请求返回状态200，（请求不是

BadRequest

或

NotAuthorized

）

string url = 'your url here';

// usually you create on HttpClient per Application (it is the best practice)
HttpClient client = new HttpClient();

using (HttpResponseMessage response = await client.GetAsync(url))
{
    using (HttpContent content = response.Content)
    {
         var json = await content.ReadAsStringAsync();
    }
}

欲了解完整详细信息并了解如何将

async/await

与

HttpClient

一起使用，您可以阅读 此答案

的详细信息