向C#发送多个FormData格式的JSON列表和图像

using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using Newtonsoft.Json;

class Program
{
    static async System.Threading.Tasks.Task Main(string[] args)
    {
        var client = new HttpClient();

        // 创建 FormData
        var formData = new MultipartFormDataContent();

        // 添加 JSON 列表
        var jsonList = new List<dynamic>
        {
            new { Name = "Item1", Value = 1 },
            new { Name = "Item2", Value = 2 }
        };
        var jsonString = JsonConvert.SerializeObject(jsonList);
        var jsonContent = new StringContent(jsonString, Encoding.UTF8, "application/json");
        formData.Add(jsonContent);

        // 添加图像文件
        var imageFile = new FileInfo("path/to/image.jpg");
        var imageContent = new ByteArrayContent(File.ReadAllBytes(imageFile.FullName));
        imageContent.Headers.ContentType = MediaTypeHeaderValue.Parse("multipart/form-data");
        formData.Add(imageContent);

        // 发送请求
        var response = await client.PostAsync("https://your-api-endpoint.com/upload", formData);

        // 处理响应
        if (response.IsSuccessStatusCode)
        {
            Console.WriteLine("上传成功");
        }
        else
        {
            Console.WriteLine($"上传失败，状态码: {response.StatusCode}");
        }
    }
}