如何在wpf命令中传递textbox KeyEventArgs和TextBox值

public class MyCommand : ICommand
{
    public event EventHandler CanExecuteChanged;

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        // 在这里处理命令逻辑
        if (parameter is Tuple<KeyEventArgs, string> tuple)
        {
            KeyEventArgs e = tuple.Item1;
            string text = tuple.Item2;

            // 处理KeyEventArgs和TextBox值
            // ...
        }
    }
}

<TextBox x:Name="myTextBox" Text="{Binding MyText}" KeyDown="TextBox_KeyDown">
    <TextBox.InputBindings>
        <KeyBinding Key="Enter" Command="{Binding MyCommand}">
            <KeyBinding.CommandParameter>
                <Tuple x:TypeArguments="KeyEventArgs, String">
                    <KeyEventArgs xmlns:sys="clr-namespace:System;assembly=mscorlib" />
                    <sys:String>{Binding ElementName=myTextBox, Path=Text}</sys:String>
                </Tuple>
            </KeyBinding.CommandParameter>
        </KeyBinding>
    </TextBox.InputBindings>
</TextBox>

public class MyViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public ICommand MyCommand { get; }

    private string _myText;
    public string MyText
    {
        get { return _myText; }
        set
        {
            _myText = value;
            OnPropertyChanged(nameof(MyText));
        }
    }

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

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