C#使用HttpClient上傳文件並附帶其他參數

HttpClient和MultipartFormDataContent（傳送門）最低適用於.NET Framework 4.5版本

發送端代碼

using (HttpClient client = new HttpClient())
{
    var content = new MultipartFormDataContent();
    //添加字符串參數，參數名為qq
    content.Add(new StringContent("123456"), "qq");

    string path = Path.Combine(System.Environment.CurrentDirectory, "1.png");
    //添加文件參數，參數名為files，文件名為123.png
    content.Add(new ByteArrayContent(System.IO.File.ReadAllBytes(path)), "file", "123.png");

    var requestUri = "http://192.168.1.108:56852/api/Test/SaveFile";
    var result = client.PostAsync(requestUri, content).Result.Content.ReadAsStringAsync().Result;

    Console.WriteLine(result);
}

接收端代碼

[HttpPost]
public async Task<JsonResult> SaveFile([FromForm]string qq, IFormFile file)
{
    return await Task.Run(() =>
    {
        try
        {
            //保存文件到本地
            var filefullPath = Path.Combine(Directory.GetCurrentDirectory(), file.FileName);
            using (FileStream fs = new FileStream(filefullPath, FileMode.Create))
            {
                file.CopyTo(fs);
                fs.Flush();
            }
        }
        catch (Exception ex)
        {
            return Fail(file.FileName + "---" + ex.Message);
        }
        return Success();
    });
}