protected override async void LoadState(object param, Dictionary <string, object> pageState)
{
base.LoadState(param, pageState);
int id = (int)param;
VideoDataItem item = VideoDataSource.GetItem(id);
if (item != null)
{
OpenFile(item.File);
}
else if (pageState["fileToken"] != null)
{
StorageItemAccessList future = StorageApplicationPermissions.FutureAccessList;
StorageFile file = await future.GetFileAsync(pageState["fileToken"] as string);
future.Clear();
OpenFile(file);
}
if (pageState != null)
{
MediaPlayerState state = pageState["MediaState"] as MediaPlayerState;
if (state != null)
{
MediaPlayer.RestorePlayerState(state);
}
}
}
protected override void OnNavigatedTo(NavigationEventArgs e) //当本页面成为框架中的活动页时调用
{
//确保我们不会耗尽StoreItemAccessList条目
//当我们不需要坚持这个跨应用程序会话页
//每次结算应该足够。
storageItemAccessList = StorageApplicationPermissions.FutureAccessList;
storageItemAccessList.Clear();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
// Make sure we don't run out of entries in StoreItemAccessList.
// As we don't need to persist this across app sessions/pages
// every time should be sufficient for us.
storageItemAccessList = StorageApplicationPermissions.FutureAccessList;
storageItemAccessList.Clear();
}
private static async Task <StorageFolder> PickFolder()
{
FolderPicker picker = new FolderPicker();
picker.FileTypeFilter.Add(".");
StorageFolder picked = await picker.PickSingleFolderAsync();
Fal.Clear();
Fal.Add(picked);
return(picked);
}
protected override void SaveState(Dictionary <string, object> pageState)
{
MediaPlayerState state = MediaPlayer.GetPlayerState();
StorageItemAccessList future = StorageApplicationPermissions.FutureAccessList;
future.Clear();
string token = future.Add(file);
pageState.Add("MediaState", state);
pageState.Add("fileToken", token);
base.SaveState(pageState);
if (teardown)
{
MediaPlayer.Dispose();
}
}
public MainPage()
{
this.InitializeComponent();
fal.Clear();
}