asp.net mvc 上传图片流存服务器

　　　　　　　　　　　　foreach (var file in Request.Files)
                    {
                        var pathSrc = System.Web.HttpContext.Current.Server.MapPath("~/Upload/" + dt + "." + file.Name.Split('.')[1]);
                        using (FileStream fs = new FileStream(pathSrc, FileMode.Create))
                        {
                            file.Value.CopyTo(fs);
                        }

                        return Response.AsJson(new { img = "http://" + Request.Url.HostName + "/Upload/" + dt + "." + file.Name.Split('.')[1] });
                    }