private void LoadProgramsAsync()
{
if (loadProgramsOperation != null)
{
loadProgramsOperation.RequestCancellation();
}
pgbUpdating.BeginAnimation(ProgressBar.ValueProperty, null, HandoffBehavior.SnapshotAndReplace);
pgbUpdating.Value = 0;
var activeChannels = TvChannel.AllChannels.Where(x => App.Preferences.IsChannelEnabled(x));
var day = date.Date;
var pages = activeChannels.Select(x => new ChannelDay(x, day)).ToList();
var loader = new PagesLoader();
loadProgramsOperation = new BackgroundUIFunction <IEnumerable <TvProgram> >(op => loader.ExecuteLoadPrograms(op, pages).OrderBy(x => x.Date).ToList());
loadProgramsOperation.Finished += new BackgroundOperationBase.FinishedEventHandler(loadProgramsOperation_Finished);
loadProgramsOperation.UserTextChange += new BackgroundUIAction.UserTextChangeEventHandler(loadProgramsOperation_UserTextChange);
loadProgramsOperation.ProgressChange += new BackgroundUIAction.ProgressChangeEventHandler(loadProgramsOperation_ProgressChange);
loadProgramsOperation.ReportProgressChange += new BackgroundUIAction.ReportProgressChangeEventHandler(loadProgramsOperation_ReportProgressChange);
pnlPrograms.Visibility = System.Windows.Visibility.Collapsed;
pnlUpdating.Visibility = System.Windows.Visibility.Visible;
loadProgramsOperation.InvokeAsync();
}
public IEnumerable <TvProgram> ExecuteLoadPrograms(BackgroundUIFunction <IEnumerable <TvProgram> > op, List <ChannelDay> pages)
{
_op = op;
op.ReportProgress = false;
op.UserText = "Caricamento programmi";
_programs = new List <TvProgram>();
var missingPages = new List <ChannelDay>();
foreach (var page in pages)
{
var html = GetHtml(page.Url, true);
if (html == null)
{
missingPages.Add(page);
}
else
{
page.SetHtml(html);
}
}
if (missingPages.Any())
{
_ewh = new System.Threading.EventWaitHandle(false, System.Threading.EventResetMode.ManualReset);
_totalTasks = missingPages.Count;
_executedTasks = 0;
op.Progress = 1 / (float)_totalTasks;
op.ReportProgress = true;
op.Progress = 0;
foreach (var page in missingPages)
{
var thisPage = page;
var task = new BackgroundFunction <string>(x => GetHtml(thisPage.Url, false));
task.Finished += new BackgroundOperationBase.FinishedEventHandler((o) => { task_Finished(o, thisPage); });
task.InvokeAsync();
}
_ewh.WaitOne();
op.Progress = 1;
}
op.UserText = "Attendere...";
foreach (var page in pages)
{
try
{
_programs.AddRange(page.GetProgramsFromSavedHtmlIfAvailable());
}
catch (Exception ex)
{
ex.Data.Add("OriginalStackTrace", ex.StackTrace);
this.exception = ex;
#if DEBUG
throw;
#endif
}
}
if (_programs.Count < 20 && exception != null)
{
throw exception;
}
return(_programs.OrderBy(x => x.Date));
}
