将两个属性绑定到==>单个控件

<TextBox>
    <TextBox.Text>
        <MultiBinding StringFormat=\"{}{0} {1}\" Mode=\"OneWay\">
            <Binding Path=\"FirstName\"/>
            <Binding Path=\"LastName\"/>
        </MultiBinding>
    </TextBox.Text>
</TextBox>

<TextBlock>
  <TextBlock.Text>
    <MultiBinding Converter=\"{StaticResource myConverter}\">
      <Binding Path=\"FirstName\" />
      <Binding Path=\"LastName\" />
    </MultiBinding>
  </TextBlock.Text>
</TextBlock>

public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
    string[] strings = ((string)value).Split(\' \');
    return strings;
}

IndexOutOfRangeException

<TextBlock Name=\"textBox\">
  <TextBlock.Text>
    <MultiBinding>
      <Binding Path=\"FirstName\"/>
      <Binding Path=\"LastName\"/>
    </MultiBinding>
  </TextBlock.Text>
</TextBlock>