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ASP.NET Core 如何使用 C# 向端点发出 POST 请求

news 来源：原创 2025/5/17 15:19:46

使用 C#，将 JSON POST 到 REST API 端点；如何从 REST API 接收 JSON 数据。

本文需要 ASP .NET Core，并兼容 .NET Core 3.1、.NET 6和.NET 8。

要从端点获取数据，请参阅本文。

使用 . 将 JSON 数据发布到端点非常容易HttpClient，WebClient并且HttpWebRequest不应使用，因为在撰写本文时它们已被弃用。

将 JSON 发布到端点

private async Task PostJson()
{
string json = System.Text.Json.JsonSerializer.Serialize(new { name = "test" });

using (var client = new System.Net.Http.HttpClient())
{
client.Timeout = System.Threading.Timeout.InfiniteTimeSpan;

var response = await client.PostAsync("http://0.0.0.0/endpoint", new StringContent(json, Encoding.UTF8, "application/json"));

var repsonseObject = System.Text.Json.JsonSerializer.Deserialize<object> // NOTE: replace "object" with class name

(await response.Content.ReadAsStringAsync());
// NOTE: use responseObject here
}
}
await PostJson();

使用 JSON Web Token Bearer 身份验证进行 POST

使用 JWT Bearer Authentication 向端点发送 POST 消息非常简单。只需使用HttpRequestMessage类和SendAsync()方法即可。

private async Task PostJsonWithJwtAuth()
{
object? responseObject = null; // NOTE: replace "object" with the class name

string json = System.Text.Json.JsonSerializer.Serialize(new { data = "ABCD1234" });

   using (var client = new System.Net.Http.HttpClient())
   {
       client.Timeout = System.Threading.Timeout.InfiniteTimeSpan;

var requestMsg = new HttpRequestMessage(HttpMethod.Post, "http://0.0.0.0/endpoint");

requestMsg.Content = new StringContent(json, Encoding.UTF8, "application/json");

string jwt = "asidlfbvc87w4tguiwebo87w4gqowuy4bfoq4837yo8f3fl"; // NOTE: THIS IS THE JSON WEB TOKEN; REPLACE WITH A REAL JWT
requestMsg.Headers.Add("Authorization", "Bearer " + jwt);

var response = await client.SendAsync(requestMsg);

       if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized)
       {
           // NOTE: THEN TOKEN HAS EXPIRED; HANDLE THIS SITUATION
       }
       else if (response.StatusCode == System.Net.HttpStatusCode.NoContent)
           responseObject = null;
       else if (response.IsSuccessStatusCode)
           responseObject = await response.Content.ReadFromJsonAsync<object>(); // NOTE: replace "object" with the class name
   }
}
await PostJsonWithJwtAuth();

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