c# API接受图片文件以文件格式上传图片

   /// 文件图片上传 
        /// </summary> 
        /// <returns>成功上传返回上传后的文件名</returns>
        [HttpPost]
        public async Task<IHttpActionResult> UpLoadImageFiles()
        {

            var files = HttpContext.Current.Request.Files;
            if (files.AllKeys.Any())
            {
                using (HttpClient client = new HttpClient())
                {
                    HttpContextBase HttpContext = (HttpContextBase)Request.Properties["MS_HttpContext"];
                    var request = new HttpRequestMessage(HttpMethod.Post, ConfigurationManager.AppSettings["SaveToImgaes"].ToString() + "/Upload/");
                    var content = new MultipartFormDataContent();
                    content.Add(new StreamContent(HttpContext.Request.Files[0].InputStream), "file", "file.jpg");
                    request.Content = content;
                    var response = await client.SendAsync(request);
                    response.EnsureSuccessStatusCode();
                    var filenamestr = await response.Content.ReadAsStringAsync();//结果
                }
            }
            return Ok();
        }