.net请求被中止请求已被取消

            使用下面这个代码，一传文件就会收到一个异常“请求被中止: 请求已被取消” InnerExcept "在写入所有字节之前不能关闭流"
            这个代码是放在子线程中执行的 ，如果用主线程就不会出错。
             try
            {
                Aliyun.OpenServices.ClientConfiguration config = new Aliyun.OpenServices.ClientConfiguration();
                config.ConnectionTimeout = -1;
                Aliyun.OpenServices.OpenStorageService.OssClient OSSClient = new Aliyun.OpenServices.OpenStorageService.OssClient(new Uri("http://oss.aliyuncs.com"), AccessKeyID, AccessKeySecret, config);
                Aliyun.OpenServices.OpenStorageService.ObjectMetadata metadate = new Aliyun.OpenServices.OpenStorageService.ObjectMetadata();
                metadate.ContentLength = model.ContentLength;
                metadate.ContentType = model.ContentType;
                Aliyun.OpenServices.OpenStorageService.PutObjectResult result = OSSClient.PutObject(Bucket, Key, model.Filestream, metadate);
            }
            catch (Aliyun.OpenServices.ServiceException sex)
            {
            }


            catch (Exception ex)
            {


            }