如何在 C# 中使用 Content 和 Headers 调用 Rest API？

Question

我正在尝试使用 c# 中的内容和标头调用 Rest API。实际上我正在尝试从 Python 代码转换为 c#，即：

import requests
url = 'http://url.../token'
payload = 'grant_type=password&username=username&password=password'
headers = {
  'Content-Type': 'application/x-www-form-urlencoded'
}
response = requests.request('POST', url, headers = headers, data = payload, allow_redirects=False)
print(response.text)

到目前为止，我正在尝试：

HttpClient client = new HttpClient();
client.BaseAddress = new Uri(Url);

var tmp = new HttpRequestMessage
{
    Method = HttpMethod.Post,
    Content =
            {

            }
     };

    var result = client.PostAsync(Url, tmp.Content).Result;
}

我不知道如何从 Python 代码中放入 Headers (Content-Type) 和附加字符串 (payload)。

Answer 1

这是我在我的一个应用中使用的示例：

_client = new HttpClient { BaseAddress = new Uri(ConfigManager.Api.BaseUrl), 
                           Timeout = new TimeSpan(0, 0, 0, 0, -1) };

_client.DefaultRequestHeaders.Accept.Clear();
_client.DefaultRequestHeaders.Accept.Add(
                     new MediaTypeWithQualityHeaderValue("application/json"));
_client.DefaultRequestHeaders.Add("Bearer", "some token goes here");

Answer 2

如果您使用RestSharp，您应该可以使用以下代码调用您的服务

var client = new RestClient("http://url.../token");
var request = new RestRequest(Method.POST);
request.AddHeader("content-type", "application/x-www-form-urlencoded");
request.AddParameter("application/x-www-form-urlencoded", "grant_type=password&username=username&password=password", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
var result = response.Content;

我的答案基于this answer 的答案。

Answer 3

using System.Net.Http;

var content = new StringContent("grant_type=password&username=username&password=password");
content.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
client.PostAsync(Url, content);

---

或者使用FormUrlEncodedContent而不设置标题

var data = new Dictionary<string, string>
{
    {"grant_type", "password"},
    {"username", "username"},
    {"password", "password"}
};
var content = new FormUrlEncodedContent(data);
client.PostAsync(Url, content);

---

如果您编写 UWP 应用程序，请在 Windows.Web.Http.dll 中使用 HttpStringContent 或 HttpFormUrlEncodedContent。

using Windows.Web.Http;

var content = new HttpStringContent("grant_type=password&username=username&password=password");
content.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
client.PostAsync(Url, content);

---

var data = new Dictionary<string, string>
{
    {"grant_type", "password"},
    {"username", "username"},
    {"password", "password"}
};
var content = new FormUrlEncodedContent(data);
client.PostAsync(Url, content);