.Net 两个Api 服务间的文件传递

两个服务间想传递文件数据，需要使用  MultipartFormDataContent 来模拟表单提交。其他形式基本都是 415 错误码，例如直接传递StreamContent。

Client Code

 public async Task ClientUpload(){
            var handler = new HttpClientHandler();
            handler.ServerCertificateCustomValidationCallback = delegate { return true; };

            HttpClient httpClient = new HttpClient(handler);
            var m = new MultipartFormDataContent();
            var file=new FileInfo("test-File.json");
            m.Add(new StreamContent(file.OpenRead()), name: "test", fileName: file.Name); // 这里的name需要和service 函数的参数名一致，否则无法参数获取
            httpClient.BaseAddress = new Uri("service-host-url");
            var response = await httpClient.PostAsync("/file/ServiceUpload", m);
            var content = await response.Content.ReadAsStringAsync();
        }

Service Code

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.ComTypes;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace Service.Controllers
{
    [Route("[controller]")]
    public class FileController : ControllerBase
    {
        [HttpPost("ServiceUpload")]
        public int Upload( Microsoft.AspNetCore.Http.IFormFile file)
        {
            var fileName = file.FileName;
            return 1;
        }
    }
}