WPF:如何绑定到另一个控件绑定的属性？

   <local:MultiBindingConverter x:Key="multiBindingConverter" />
</Window.Resources>

   <Button.IsEnabled>
       <MultiBinding Converter="{StaticResource multiBindingConverter}">
           <Binding ElementName="textBox" Path="Text" />
           <Binding ElementName="checkBox" Path="IsChecked" />
        </MultiBinding>
    </Button.IsEnabled>
</Button><TextBox x:Name="textBox" /><CheckBox x:Name="checkBox" />

public class MultiBindingConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if (values[0] == null || values[1] == null)
        {
            return false;
        }

        string text = (string)values[0];
        bool isChecked = (bool)values[1];

        return !string.IsNullOrEmpty(text) && isChecked;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}