public async void Run(IBackgroundTaskInstance taskInstance)
{
AddQuestionsResult result = null;
BackgroundTaskDeferral deferral = taskInstance.GetDeferral();
#if DEBUG
InvokeSimpleToast("Hello from " + taskInstance.Task.Name);
#endif
try
{
result = await FeedManager.QueryWebsitesAsync();
#if DEBUG
InvokeSimpleToast(String.Format(
"There are {0} new questions and {1} updated questions.",
result.AddedQuestions,
result.UpdatedQuestions));
#endif
}
catch (Exception ex)
{
Debug.WriteLine(ex);
#if DEBUG
InvokeSimpleToast(ex.Message);
#endif
}
deferral.Complete();
}
public static void RemoveQuestionsAndSave(IList <string> keysToDelete)
{
// Remove from questions-list and add to read-questions-list.
foreach (string key in keysToDelete)
{
if (questionsCollection.Remove(key))
{
ReadListManager.AddReadQuestion(key);
}
else
{
// Removing a question that was not in the questions-list.
Debugger.Break();
}
}
// Only save if at least one question was deleted.
if (keysToDelete.Count > 0)
{
ReadListManager.LimitTo450AndSave();
// Do not wait until questions-save is completed.
var saveOperation = QuestionsManager.SaveAsync();
// And refresh tile and badge.
FeedManager.UpdateTileAndBadge();
}
}
// Notice that tile update, badge update and saveing only occurs if at least one questions is removed.
public static IAsyncAction RemoveReadQuestionsUpdateTileAndBadgeAndSaveAsync()
{
return(AsyncInfo.Run(async(cancellationToken) =>
{
uint removedQuestions = await RemoveQuestionsInReadList();
// Only save if at least one question was deleted.
if (removedQuestions > 0)
{
await QuestionsManager.SaveAsync();
FeedManager.UpdateTileAndBadge();
}
}));
}
public static IAsyncOperation <AddQuestionsResult> QueryTagAsync(string websiteUrl, string tagEncoded)
{
return(AsyncInfo.Run(async(cancellationToken) =>
{
// Retrieve questions, skip the LatestPubDate validation and add all questions.
AddQuestionsResult result = await FeedManager.QuerySingleWebsiteAsync(websiteUrl, tagEncoded, true);
// Only limit and save questions if list changed.
if (result.AddedQuestions > 0 || result.UpdatedQuestions > 0)
{
uint removedQuestions = await QuestionsManager.RemoveQuestionsInReadList();
await QuestionsManager.LimitTo150AndSaveAsync();
FeedManager.UpdateTileAndBadge();
}
return result;
}));
}
