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? ??? ?? C++ WPF ??? ?? ???? ViewModelBase? ??? ????? ??? ??????

WPF ??? ?? ???? ViewModelBase? ??? ????? ??? ??????

Jan 12, 2025 pm 08:47 PM

How to Bind a WPF Button's Click Event to a Command in a ViewModelBase?

WPF ??? ViewModelBase? ??? ????? ??

WPF(Windows Presentation Foundation)??? ??? ?????(UI) ??? ? ??(?: ViewModelBase)? ??? ??? ???? ?? ??? ??? ? ??? ??????? ????? ? ?????. ? ????? ??? ?? ???? ViewModelBase? ??? ????? ?? ??? ???? ?????.

?? ??

?? ??? AttributeView? ??? ???? ? ViewModelBase ???? ??? ???? ? ??? ??????. ??? ??? ??? ??? ????? ????.

??? ??

? ??? ????? ??? WPF ??? ??? ??? ViewModelBase ???? ?? ??? ???? ???? ??? ???? ???. ????? ??? ??? ????.

<grid><grid.columndefinitions><columndefinition width="*"></columndefinition></grid.columndefinitions>
</grid>
// MainWindow.xaml.cs
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new ViewModelBase();
    }
}
// ViewModelBase.cs
public class ViewModelBase : INotifyPropertyChanged // Added INotifyPropertyChanged
{
    private ICommand _clickCommand;

    public ICommand ClickCommand
    {
        get
        {
            return _clickCommand ?? (_clickCommand = new CommandHandler(() => MyAction(), () => CanExecute));
        }
    }

    public bool CanExecute
    {
        get
        {
            // 定義命令是否可執(zhí)行的邏輯
            // 在此示例中,始終返回true
            return true;
        }
    }

    public void MyAction()
    {
        // 實(shí)現(xiàn)按鈕單擊時(shí)要執(zhí)行的操作
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}
// CommandHandler.cs
public class CommandHandler : ICommand
{
    private Action _action;
    private Func<bool> _canExecute;

    public CommandHandler(Action action, Func<bool> canExecute)
    {
        _action = action;
        _canExecute = canExecute;
    }

    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    public bool CanExecute(object parameter)
    {
        return _canExecute.Invoke();
    }

    public void Execute(object parameter)
    {
        _action();
    }
}

??

??? ??? MVVM(Model-View-ViewModel) ??? ?????. ViewModelBase? ClickCommand ??? ??? Command ??? ??????. CommandHandler ???? ??(MyAction)? ???? ?? ?? ?? ??? ??(CanExecute)?? ??? ?????. ? ???? ?????? ?? ??? ???? ??? ??? ? ????. ViewModelBase ???? INotifyPropertyChanged ?????? ???? OnPropertyChanged ???? ???? ?? ?? ??? UI? ???? ????? ???.

??

WPF? ???? ViewModelBase? ??? ??? ?????? ?? ?? ? ??? ??? ???? ?? ??? ??? ?? ??? ???? ?????. ? ??? ??? ??? ?????? ???? UI ??? ??? ????? ???? ??????? ???? ???? ? ????.

? ??? WPF ??? ?? ???? ViewModelBase? ??? ????? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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