WPF GetPortNames() 绑定系统资源

<Window x:Class="SerialPortBinding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ports="clr-namespace:System.IO.Ports;assembly=System"
        Title="MainWindow" SizeToContent="WidthAndHeight">
    <Window.Resources>
        <ObjectDataProvider ObjectType="{x:Type ports:SerialPort}" MethodName="GetPortNames" x:Key="portNames"/>
    </Window.Resources>
    <ComboBox ItemsSource="{Binding Source={StaticResource portNames}}"/>
</Window>