Question

我正在开发一个用于网页抓取的WP 8应用程序。出于某些原因，我不知道为什么，我的应用程序崩溃了。

以下是我的示例代码：

private void Load(object sender, RoutedEventArgs e)
    {
        try
        {
            HttpWebRequest req = (HttpWebRequest)WebRequest.CreateHttp("http://" + "www.google.com"); 
            req.BeginGetResponse(new AsyncCallback(ResponseCallback), req);
        }
        catch (WebException ex)
        {
            MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK);
        }
    }

    private async void ResponseCallback(IAsyncResult asyncres)
    {
        try
        {
            HttpWebRequest wreq = (HttpWebRequest)asyncres.AsyncState;
            HttpWebResponse wres = (HttpWebResponse)wreq.EndGetResponse(asyncres);

            StreamReader sr = new StreamReader(wres.GetResponseStream());

            string result = await sr.ReadToEndAsync();

            //HTML View
            HTML.Text = result;

            //Readable
            string read;
            read = Regex.Replace(result, "<script.*?</script>", "", RegexOptions.Singleline | RegexOptions.IgnoreCase);
            read = Regex.Replace(read, "<style.*?</style>", "", RegexOptions.Singleline | RegexOptions.IgnoreCase);
            read = Regex.Replace(read, "</?[a-z][a-z0-9]*[^<>]*>", "");
            read = Regex.Replace(read, "<!--(.|\\s)*?-->", "");
            read = Regex.Replace(read, "<!(.|\\s)*?>", "");
            read = Regex.Replace(read, "[\t\r\n]", " ");

            readable.Text = read;
            }
        catch (WebException ex)
        {
            //MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK);
        }
   }

但是我试图通过HTML和可读文本同时获取电子邮件，URL和脚本（所以如果这可能是个问题？）

此外，我无法在我的Windows Phone 8仿真器中运行Internet（尝试了很多事情仍然无法正常工作！）所以我需要在物理设备上检查这一点，并且应用程序崩溃了。

我选择了网络功能。（如果需要任何其他功能，请告诉我）

请帮帮我，我在这里缺少什么？

谢谢，

此致

鲁曼

Answer 1

这可能是因为您正在与非UI线程（响应回调）上的UI元素进行交互。

尝试将代码与UI元素交互放在Dispatcher.BeginInvoke方法中，如下所示：

private async void ResponseCallback(IAsyncResult asyncres)
{
    try
    {
        HttpWebRequest wreq = (HttpWebRequest)asyncres.AsyncState;
        HttpWebResponse wres = (HttpWebResponse)wreq.EndGetResponse(asyncres);

        StreamReader sr = new StreamReader(wres.GetResponseStream());

        string result = await sr.ReadToEndAsync();

        //HTML View
        Deployment.Current.Dispatcher.BeginInvoke(() =>
        {
            HTML.Text = result;
        });


        //Readable
        string read;
        read = Regex.Replace(result, "<script.*?</script>", "", RegexOptions.Singleline | RegexOptions.IgnoreCase);
        read = Regex.Replace(read, "<style.*?</style>", "", RegexOptions.Singleline | RegexOptions.IgnoreCase);
        read = Regex.Replace(read, "</?[a-z][a-z0-9]*[^<>]*>", "");
        read = Regex.Replace(read, "<!--(.|\\s)*?-->", "");
        read = Regex.Replace(read, "<!(.|\\s)*?>", "");
        read = Regex.Replace(read, "[\t\r\n]", " ");

        Deployment.Current.Dispatcher.BeginInvoke(() =>
        {
            readable.Text = read;
        });

        }
    catch (WebException ex)
    {
        //MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK);
    }
}

Answer 2

@Olivier的答案应该适合你。关于模拟器上的Internet，打开Network and Sharing Center并检查是否存在名为Windows Phone Emulator Internal Switch的连接或与此相关的内容。如果没有，请从左侧面板转到Change Adapter Settings。再次寻找与Emulator相关的内容。右键单击并启用它（如果已禁用）。

这是我能想到的唯一原因。

应用程序在WP 8中进行Web抓取时崩溃

2 个答案: