文本框上的wpf MVVM焦点光标

<!-- 视图（View） -->
<Window>
    <Grid>
        <TextBox Text="{Binding Text}" IsFocused="{Binding IsFocused}" />
    </Grid>
</Window>

// 视图模型（ViewModel）
public class MyViewModel : INotifyPropertyChanged
{
    private string _text;
    private bool _isFocused;

    public string Text
    {
        get { return _text; }
        set
        {
            _text = value;
            OnPropertyChanged(nameof(Text));
        }
    }

    public bool IsFocused
    {
        get { return _isFocused; }
        set
        {
            _isFocused = value;
            OnPropertyChanged(nameof(IsFocused));
        }
    }

    // 实现INotifyPropertyChanged接口的代码略

    // 其他视图模型逻辑代码略
}