WPF字典数据绑定至DataGrid问题求助

我正在开发一个WPF程序，功能是接收字符串，解析后存入字典（键为列标题，值为对应列内容）。解析完成后弹出第二个WPF窗口，通过DataGrid展示解析结果。我查过Stack Overflow的相关方案，但都不适用我的场景。

MainWindow代码 #

public MainWindow()
{
    
    InitializeComponent();
    DataContext = this;
}

private void Button_Click(object sender, RoutedEventArgs e)
{
    string input = HelloTextBox.Text;

    IMessage message = parseMessage(input);

    Type messageType = message.GetType();

    PropertyList proplist = GetPropertyList(messageType, message);

    // display message properties in popup window
    InfoDialog infoPopUp = new(proplist);
    infoPopUp.ShowDialog();

}

弹窗窗口代码 #

public partial class InfoDialog : Window
{
    
    public PropertyList PropertyList { get; set; }
    public InfoDialog(PropertyList propList)
    {
        InitializeComponent();
        this.PropertyList = propList;
        
    }

XAML代码 #

<Grid>
    ItemsSource="{Binding PropertyList,
          RelativeSource={RelativeSource AncestorType=Window}}" AutoGenerateColumns="False" SelectionChanged="DataGridXAML_SelectionChanged">
        <DataGrid.Columns>
            <!-- Header Text and Bindings -->
            <DataGridTextColumn Header="Key" Binding="{Binding Key}" Width="*"/>
            <DataGridTextColumn Header="Value" Binding="{Binding Value}"  Width="*"/>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

内容的提问来源于stack exchange，提问作者shayanvalaie