public MainWindow()
{
InitializeComponent();
vm = new MainWindowViewModel();
DataContext = vm;
Answer.Focus();
}
private void Answer_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key == Key.Enter)
{
if(vm.CurrentProblem == null)
{
vm = new MainWindowViewModel();
DataContext = vm;
}
int answer;
if (int.TryParse(Answer.Text, out answer))
{
vm.AnswerCurrentProblem(answer);
}
Answer.Text = "";
}
}