C# 发送HttpWebRequest获得网络图片的大小、尺寸

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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：

/// <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");

            }

        }