void UpdateStatistics()
{
StatisticsViewModel stat = new StatisticsViewModel();
foreach (var e in AllModels.Where(z => z.Selected))
{
stat.EpisodesCount += e.Model.Montage.Information.Episodes.Count;
stat.TotalClean += (int)e.Model.Montage.Information.Episodes.Sum(z => z.Duration.TotalMinutes);
stat.TotalDirty += e.Model.Montage.Chunks.Where(z => z.Mode != Mode.Undefined).Sum(z => z.Length) / 60000;
}
Statistics = stat;
this.NotifyByExpression(z => z.Statistics);
}
private IEnumerable <ToDoViewModel> GetToDoModelsByCondition(Func <ToDoViewModel, bool> predicate) => AllModels .Where(predicate) .OrderByDescending(x => x.WhenHappens);