Question

所以有人请告诉我当我点击列表框中的特定歌曲时如何播放视频。我已经解析了RSS提要并在列表框中显示了所有视频..

我有一个名为Songsdetails的类，其属性很少

  public class Songsdetails

{

      public string songname { get; set; }
      public string songpic { get; set; }
      public string songurl { get; set; }
      public string songcode { get; set; }
      public string songdescr { get; set; }
      public string songtitletags { get; set; }
      public string songmetatags { get; set; }
      public string songmetadesc { get; set; }
      public string songdate { get; set; }

}

我通过以下过程将此歌曲代码称为Videopage.Xaml.cs。但是没有调用歌曲代码。变量中存在Null。

namespace videosongs
{
    public partial class Videopage : PhoneApplicationPage
    {
        // Constructor
        public Videopage()
        {
        InitializeComponent();

        Songsdetails songdetails=new Songsdetails();
        string code = songdetails.songcode;
        string video = "http://www.youtube.com/embed/"+code;
        System.Diagnostics.Debug.WriteLine(video);
        this.webBrowser.Navigate(new Uri(video));

        }

请有人帮忙如何获取歌曲码。我不明白为什么歌曲码不会出现。通过这首歌曲代码视频将在模拟器中播放。请任何人帮忙是错误的。如何获得歌曲码值。三江源。

namespace videosongs
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();

    }

    private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
    {
        // is there network connection available
        if (!System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
        {
            MessageBox.Show("No network connection available!");
            return;
        }
        // start loading XML-data
        WebClient downloader = new WebClient();
        Uri uri = new Uri("http://www.teluguone.com/videosongs/videoSongsXml.php?cat_id=6", UriKind.Absolute);
        downloader.DownloadStringCompleted += new DownloadStringCompletedEventHandler(VideosongsDownloaded);
        downloader.DownloadStringAsync(uri);
    }


    void VideosongsDownloaded(object sender, DownloadStringCompletedEventArgs e)
    {

        if (e.Result == null || e.Error != null)
        {
            MessageBox.Show("There was an error downloading the XML-file!");
        }
        else
        {

            //Deserialize if download succeeds

            {

                XDocument document = XDocument.Parse(e.Result);
                XmlSerializer serializer = new XmlSerializer(typeof(Videosongs));
                Videosongs videosongs = (Videosongs)serializer.Deserialize(document.CreateReader());
                videosongList.ItemsSource = videosongs.Collection;

            }

        }

    }

    private void videosongList_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        ListBox listBox = sender as ListBox;

        if (listBox != null && listBox.SelectedItem != null)
        {
            Songsdetails song = (Songsdetails)listBox.SelectedItem;

            NavigationService.Navigate(new Uri("/Videopage.xaml", UriKind.Relative));
        }

    }
}

} videosongs类

   namespace videosongs
    {
    [XmlRoot("videosongs")]
    public class Videosongs
   {
        [XmlElement("songsdetails")]
        public ObservableCollection<Songsdetails> Collection { get; set; }
    }

Answer 1

为您创建的数据载体类定义构造函数始终是一个好习惯。这将避免空指针异常。另外正如@germi所说，在这段代码中，邮件问题是你没有设置它。那你怎么用呢？

由于阿伦

将get属性从类调用到另一个类

1 个答案: