如何通过XAML代码中的属性来创建包含项的UserControl和要在其中插入另一个UserControl的contentControl？

<UserControl x:Class="YourNamespace.ParentUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:YourNamespace">

    <Grid>
        <ContentControl x:Name="ContentContainer" />
    </Grid>
</UserControl>

public partial class ParentUserControl : UserControl
{
    public static readonly DependencyProperty ContentProperty =
        DependencyProperty.Register("Content", typeof(UserControl), typeof(ParentUserControl), new PropertyMetadata(null, OnContentChanged));

    public UserControl Content
    {
        get { return (UserControl)GetValue(ContentProperty); }
        set { SetValue(ContentProperty, value); }
    }

    private static void OnContentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var parentUserControl = (ParentUserControl)d;
        parentUserControl.ContentContainer.Content = e.NewValue;
    }

    public ParentUserControl()
    {
        InitializeComponent();
    }
}

<Window x:Class="YourNamespace.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:YourNamespace">

    <Grid>
        <local:ParentUserControl>
            <local:ChildUserControl />
        </local:ParentUserControl>
    </Grid>
</Window>