在WPF datagrid MVVM中创建倒计时计时器列

<DataGrid ItemsSource="{Binding Items}" AutoGenerateColumns="False">
    <DataGrid.Columns>
        <!-- 其他列定义 -->
        <DataGridTemplateColumn Header="倒计时">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding TimeRemaining}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

public class ItemModel : INotifyPropertyChanged
{
    private TimeSpan timeRemaining;
    public TimeSpan TimeRemaining
    {
        get { return timeRemaining; }
        set
        {
            timeRemaining = value;
            OnPropertyChanged(nameof(TimeRemaining));
        }
    }

    // 其他属性和方法

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class MainViewModel : INotifyPropertyChanged
{
    public ObservableCollection<ItemModel> Items { get; set; }

    public MainViewModel()
    {
        Items = new ObservableCollection<ItemModel>();
        // 初始化数据项

        // 启动倒计时计时器
        var timer = new DispatcherTimer();
        timer.Interval = TimeSpan.FromSeconds(1);
        timer.Tick += Timer_Tick;
        timer.Start();
    }

    private void Timer_Tick(object sender, EventArgs e)
    {
        foreach (var item in Items)
        {
            item.TimeRemaining = item.TimeRemaining.Subtract(TimeSpan.FromSeconds(1));
        }
    }

    // 其他属性和方法

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        var mainWindow = new MainWindow();
        var viewModel = new MainViewModel();
        mainWindow.DataContext = viewModel;
        mainWindow.Show();
    }
}