C# 发送HttpWebRequest获得网络图片的大小、尺寸

可以通过HttpWebRequest的方式发送一个网络图片的请求，再通过HttpWebResponse接收返回的数据，分析数据流得到图片的大小以及尺寸，代码如下：

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/// <summary>          /// 获取图片的大小和尺寸          /// </summary>          /// <param name="aPhotoUrl">图片url</param>          /// <param name="aSize">图片大小</param>          /// <param name="aLength">图片尺寸</param>          private void GetPhotoInfo(string aPhotoUrl, ref string aSize, ref string aLength)          {              try              {                  Uri mUri = new Uri(aPhotoUrl);                  HttpWebRequest mRequest = (HttpWebRequest)WebRequest.Create(mUri);                                  mRequest.Method = "GET";                  mRequest.Timeout = 200;                  mRequest.ContentType = "text/html;charset=utf-8";                                   HttpWebResponse mResponse = (HttpWebResponse)mRequest.GetResponse();                  Stream mStream = mResponse.GetResponseStream();                  aSize = (mResponse.ContentLength / 1024).ToString() + "KB";                  Image mImage = Image.FromStream(mStream);                  aLength = mImage.Width.ToString() + "x" + mImage.Height.ToString();                  mStream.Close();              }              catch (Exception e)              {                  //MessageBox.Show(aPhotoUrl + "获取失败");              }          }