WPF MVVM：命令很简单。如何使用 RoutedEvent 连接 View 和 ViewModel

使用 RoutedEvent 连接 View 和 ViewModel

csharp
public class ViewModel
{
    public static RoutedCommand SaveCommand = new RoutedCommand();
    public ViewModel()
    {
        CommandBinding saveCommandBinding = new CommandBinding(SaveCommand, SaveExecute, CanSaveExecute);
        CommandManager.RegisterClassCommandBinding(typeof(View), saveCommandBinding);
    }
    private void SaveExecute(object sender, ExecutedRoutedEventArgs e)
    {
        // 执行保存数据的逻辑
    }
    private void CanSaveExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        // 判断是否可以执行保存数据的逻辑
        e.CanExecute = true;
    }
}

xaml

csharp
public class ViewModel : INotifyPropertyChanged
{
    public static readonly RoutedEvent DataSavedEvent = EventManager.RegisterRoutedEvent(
        "DataSaved", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(ViewModel));
    public event RoutedEventHandler DataSaved
    {
        add { AddHandler(DataSavedEvent, value); }
        remove { RemoveHandler(DataSavedEvent, value); }
    }
    private void OnDataSaved()
    {
        RoutedEventArgs args = new RoutedEventArgs(DataSavedEvent);
        RaiseEvent(args);
    }
    private void SaveData()
    {
        // 执行保存数据的逻辑
        OnDataSaved();
    }
}

xaml