/// <summary>
/// 从网络上获取频道列表
/// </summary>
/// <returns>获取到的频道列表</returns>
/// <exception cref="HttpRequestException">
/// 获取频道列表时失败。
/// </exception>
/// <exception cref="InvalidDataException">
/// 数据格式有误。
/// </exception>
public static async Task <IEnumerable <Channel> > GetChannelsAsync()
{
using (HttpClient client = new HttpClient())
{
var uri = new Uri("http://comic.sjtu.edu.cn/vlc/pl_xspf.asp");
HttpResponseMessage response = await client.GetAsync(uri, HttpCompletionOption.ResponseContentRead);
if (!response.IsSuccessStatusCode)
{
throw new HttpRequestException(string.Format("HTTP {0}", response.StatusCode.ToString()));
}
using (var xmlStream = await response.Content.ReadAsStreamAsync())
{
XDocument xDocument = await XDocument.LoadAsync(xmlStream, LoadOptions.None, CancellationToken.None);
Xspf xspf = new Xspf(xDocument, true);
return(xspf.TrackList
.Where(xspfTrack => xspfTrack.Location.Scheme == "http" || xspfTrack.Location.Scheme == "https")
.Select(xspfTrack =>
new Channel
{
Name = xspfTrack.Title,
Url = xspfTrack.Location.ToString()
}));
}
}
}
public async Task Load()
{
var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///TestFiles/comic.xspf"));
using (Stream stream = await file.OpenStreamForReadAsync())
xspf = Xspf.Load(stream);
}
/// <summary>
/// 从本地文件中获取频道列表
/// </summary>
/// <returns>获取到的频道列表</returns>
public static async Task <IEnumerable <Channel> > GetChannelsFallbackAsync()
{
var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Contents/fallback.xspf"));
using (var xmlStream = await file.OpenStreamForReadAsync())
{
XDocument xDocument = await XDocument.LoadAsync(xmlStream, LoadOptions.None, CancellationToken.None);
Xspf xspf = new Xspf(xDocument, true);
return(xspf.TrackList
.Where(xspfTrack => xspfTrack.Location.Scheme == "http" || xspfTrack.Location.Scheme == "https")
.Select(xspfTrack =>
new Channel
{
Name = xspfTrack.Title,
Url = xspfTrack.Location.ToString()
}));
}
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (xspf == null)
{
try
{
file = e.Parameter as StorageFile;
using (Stream stream = await file.OpenStreamForReadAsync())
xspf = Xspf.Load(stream);
displayList.DataContext = xspf.TrackList;
var mru = StorageApplicationPermissions.MostRecentlyUsedList;
mru.Add(file);
}
catch
{
MessageDialog msgDialog = new MessageDialog("打开文件失败");
}
}
}