public ViewModel()
{
SelectedColor = new ColorModel();
PropertyChanged += (sender, args) =>
{
if (args.PropertyName == nameof(SelectedColor))
{
deleteColorCommand.RaiseCanExecuteChanged();
addColorCommand.RaiseCanExecuteChanged();
}
};
addColorCommand = new DelegateCommand(AddSelectedColor, () => colors.Contains(SelectedColor) == false);
deleteColorCommand = new DelegateCommand(RemoveSelectedColor /*, /*()=>colors.Contains(SelectedColor) == true*/);
}