C# MVVM如何向TextBlock添加命令

public class RelayCommand : ICommand
{
    private readonly Action<object> _execute;
    private readonly Func<object, bool> _canExecute;

    public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
    {
        _execute = execute ?? throw new ArgumentNullException(nameof(execute));
        _canExecute = canExecute;
    }

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

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

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

private string _displayText;
public string DisplayText
{
    get { return _displayText; }
    set
    {
        _displayText = value;
        OnPropertyChanged(nameof(DisplayText));
        // 在这里触发命令的执行
        MyCommand.Execute(null);
    }
}

private ICommand _myCommand;
public ICommand MyCommand
{
    get { return _myCommand; }
    set { _myCommand = value; }
}

public MyViewModel()
{
    MyCommand = new RelayCommand(ExecuteMyCommand);
}

private void ExecuteMyCommand(object parameter)
{
    // 在这里执行命令的逻辑
    // 例如，更新TextBlock的内容
    DisplayText = "Hello, MVVM!";
}

<TextBlock Text="{Binding DisplayText}" />

public partial class MyView : Window
{
    public MyView()
    {
        InitializeComponent();
        DataContext = new MyViewModel();
    }
}