private Task <bool> ImportContacts(string vCardContents)
{
TaskCompletionSource <bool> tcs = new TaskCompletionSource <bool>();
Task.Run(() =>
{
bool processIsSuccessful = false;
DispatcherHelper.CheckBeginInvokeOnUI(() =>
{
processIsSuccessful = Importer.Import(Manager, vCardContents);
if (processIsSuccessful)
{
if (WorkflowSuccessAction != null)
{
WorkflowSuccessAction.Invoke();
}
}
else
{
if (WorkflowFailureAction != null)
{
WorkflowFailureAction.Invoke();
}
}
});
tcs.SetResult(processIsSuccessful);
}).ConfigureAwait(false);
return(tcs.Task);
}
private async Task <bool> LaunchFilePickerAndExportAsync()
{
bool processIsSuccessful = false;
FileSavePicker savePicker = new FileSavePicker
{
SuggestedStartLocation = PickerLocationId.Downloads,
SuggestedFileName = "PhiliaContacts"
};
savePicker.FileTypeChoices.Add("Virtual Contact File", new List <string>()
{
".vcf"
});
StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
try
{
IsBusy = true;
CachedFileManager.DeferUpdates(file);
await FileIO.WriteTextAsync(file, Writer.Write(Manager));
Windows.Storage.Provider.FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
processIsSuccessful = status == Windows.Storage.Provider.FileUpdateStatus.Complete;
if (processIsSuccessful)
{
if (WorkflowSuccessAction != null)
{
WorkflowSuccessAction.Invoke();
}
}
else
{
if (WorkflowFailureAction != null)
{
WorkflowFailureAction.Invoke();
}
}
}
finally
{
DispatcherHelper.CheckBeginInvokeOnUI(() =>
{
IsBusy = false;
ExportCommand.RaiseCanExecuteChanged();
});
}
}
return(processIsSuccessful);
}