WPF 中的自定义日期时间字符串格式

WPF 中的自定义日期时间字符串格式

xaml

csharp
public class CountdownViewModel : INotifyPropertyChanged
{
    private DateTime _endTime;
    private DispatcherTimer _timer;
    public string RemainingTime { get; private set; }
    public CountdownViewModel()
    {
        _endTime = DateTime.Now.AddMinutes(30);
        _timer = new DispatcherTimer();
        _timer.Interval = TimeSpan.FromSeconds(1);
        _timer.Tick += Timer_Tick;
        _timer.Start();
    }
    private void Timer_Tick(object sender, EventArgs e)
    {
        TimeSpan remainingTime = _endTime - DateTime.Now;
        RemainingTime = remainingTime.ToString(@"hh\:mm\:ss");
        OnPropertyChanged(nameof(RemainingTime));
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}