image加载网络图片遇到问题

Question

http://regcheckcode.taobao.com/auction/checkcode?sessionID=a2b3e64c8ab1f8b928999689429e9371&t=1369277957871

这个连接是淘宝的验证码地址 刷新这个图片会变

做的是点击按钮的时候  换一个图片

按钮事件

private void changeBtn_Click(object sender, RoutedEventArgs e)
        {
            img.Source = null;
            BitmapImage bi = new BitmapImage();
            bi.BeginInit();
            bi.UriSource = new Uri("https://regcheckcode.taobao.com/auction/checkcode?sessionID=a2b3e64c8ab1f8b928999689429e9371&t=1369277957871", UriKind.RelativeOrAbsolute);
            bi.EndInit();
            img.Source = bi;
        }

请问为什么图片不会变呢  要怎么让图片向在浏览器里面刷新一样会变呢

Answer 1

可以参考下面的代码直接显示发送请求到服务器。

            BitmapImage bi = new BitmapImage();
            bi.BeginInit();

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://regcheckcode.taobao.com/auction/checkcode?sessionID=a2b3e64c8ab1f8b928999689429e9371&t=1369277957871");
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            bi.StreamSource = response.GetResponseStream();

            bi.EndInit();

            img.Source = bi;

祝，万好。

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Yoyo Jiang[MSFT]
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Answer 2

嗯   谢谢~！