public TimerViewModel()
{
timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(stepInMs);
timer.Tick += Timer_Tick;
StartCurrentTimer = new RelayCommand(Start);
StopCurrentTimer = new RelayCommand(Stop);
DeleteAllTimer = new RelayCommand(Delete);
AddPointInList = new RelayCommand(AddPoint);
CurrentTime = new RunningTime();
RunningTimes = new ObservableCollection <RunningTime>();
}
void Delete()
{
timer?.Stop();
CurrentTime = new RunningTime();
RunningTimes = new ObservableCollection <RunningTime>();
}