Show current time WPF

Question

The only way to show current time updating regularly I found is to use timer. Of course, I can implement INotifyPropertyChanged and some special property to be

Answer 1

WPF is a static markup language. As far as I am aware there is not a mechanism available in pure XAML to provide the functionally you are looking for.

If you want to avoid using a timer directly you can abstract it away using Tasks.

MainWindow XAML:

Code behind:

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        DataContext = new CurrentTimeViewModel();
    }
}

public class CurrentTimeViewModel : INotifyPropertyChanged
{
    private string _currentTime;

    public CurrentTimeViewModel()
    {
        UpdateTime();
    }

    private async void UpdateTime()
    {
        CurrentTime = DateTime.Now.ToString("G");
        await Task.Delay(1000);
        UpdateTime();
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    public string CurrentTime
    {
        get { return _currentTime; }
        set { _currentTime = value; OnPropertyChanged(); }
    }
}

This is probably one of the more succinct and certainly as "Modern" WPF you are going to get.