asp.net后台接收app发送的图片



app客户端提交表单，附加图片，asp.net后台接收代码：

Stream sr = Request.InputStream;
                byte[] buffer = new byte[4096];
                int bytesRead = 0;
                //将当前数据流写入服务器端文件夹upload下 
                const string savePath = "/upload/"; //目标图片路径
                string dirPath = Server.MapPath(savePath);
                string picName = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
                string path = dirPath + picName;
                string imgPath = "/upload/" + picName;
                using (FileStream fs = File.Create(path, 4096))
                {
                    while ((bytesRead = sr.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        //向文件中写信息 
                        fs.Write(buffer, 0, bytesRead);
                    }
                }
                Request.Files[0].SaveAs(path);  //保存上载的内容，如果没有这段代码，服务器讲接收不到图片