/// 文件图片上传         ///          /// 
    
     成功上传返回上传后的文件名
            [HttpPost]        public async Task
    
      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();        }