C#HTTP Body如何赋值

在C#中，HTTP请求的Body通常用于发送包含数据的POST、PUT或PATCH请求。你可以通过以下几种方式来设置HTTP Body：

1. 使用`HttpClient`发送`Json`内容：

   using System.Net.Http;
   using Newtonsoft.Json;

   var client = new HttpClient();
   var jsonContent = new StringContent(JsonConvert.SerializeObject(yourData), Encoding.UTF8, "application/json");
   var response = await client.PostAsync("https://api.example.com/resource", jsonContent);

这里，`yourData`是你想要发送的数据对象。

2. 发送`FormUrlEncoded`数据：

   var data = new Dictionary<string, string> { { "key1", "value1" }, { "key2", "value2" } };
   var formUrlEncodedContent = new FormUrlEncodedContent(data);
   var response = await client.PostAsync("https://api.example.com/form", formUrlEncodedContent);

3. 对于文件上传，可以使用`MultipartFormDataContent`：

   var fileStream = File.OpenRead("path_to_your_file");
   var fileContent = new StreamContent(fileStream);
   var formData = new MultipartFormDataContent();
   formData.Add(fileContent, "file", Path.GetFileName(fileStream.Name));
   // ... 添加其他表单字段 if any
   var response = await client.PostAsync("https://api.example.com/upload", formData);