public bool AddCompletedScheduleId(string id)
{
List <string> completedIds = GetCompletedScheduleIds();
if (!completedIds.Contains(id))
{
Debug.WriteLine($"Adding schedule ID {id} to the list of completed ones");
completedIds.Add(id);
string prefValue = string.Join(" ", completedIds.ToArray());
appPreferences.Set(Constants.CompletedSchedulesKey, prefValue);
Debug.WriteLine($"Wrote new list of completed schedule IDs to preferences: '{prefValue}'");
return(true);
}
return(false);
}