private void initViewModel()
{
var vm = DataContext as MainViewmodel;
disposeViewModel(vm);
vm = new MainViewmodel();
vm.GraphItems.ListChanged += GraphItems_ListChanged;
vm.AlarmSoundRequested += vm_AlarmSoundRequested;
DataContext = vm;
}
private void disposeViewModel(MainViewmodel vm)
{
if (vm == null)
{
return;
}
vm.GraphItems.ListChanged -= GraphItems_ListChanged;
vm.AlarmSoundRequested -= vm_AlarmSoundRequested;
vm.Dispose();
}