UserControl公开多个内容属性!那将是多么令人兴奋啊!

你肯定可以实现你的目标,但你需要采取不同的方法。

在Silverlight中,您必须自己实现Dpendency属性。然而,您并没有按照它们应该的方式实现它们-我倾向于使用这个 dependency property generator

DPs的一大优点是支持更改通知。因此,考虑到这一点,要使示例正常工作,您只需定义DPs:ItemContent和ListContent,它们的类型与Content(object)相同,当框架通知您其中任何一个已更改时,只需更新您的文本框即可!下面是执行此操作的代码:

MultiContent.xaml:

   <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="100" />
            <ColumnDefinition Width="100" />
        </Grid.ColumnDefinitions>
        <ContentControl x:Name="pnlList" Grid.Column="0" />
        <ContentControl x:Name="pnlItem" Grid.Column="1" />
    </Grid>    

MultiContent.xaml.cs:

namespace MultiContent
{
    public partial class MultiContent : UserControl
    {
        #region ListContent

        /// <summary>
        /// ListContent Dependency Property
        /// </summary>
        public object ListContent
        {
            get { return (object)GetValue(ListContentProperty); }
            set { SetValue(ListContentProperty, value); }
        }
        /// <summary>
        /// Identifies the ListContent Dependency Property.
        /// </summary>
        public static readonly DependencyProperty ListContentProperty =
            DependencyProperty.Register("ListContent", typeof(object),
            typeof(MultiContent), new PropertyMetadata(null, OnListContentPropertyChanged));

        private static void OnListContentPropertyChanged
          (object sender, DependencyPropertyChangedEventArgs e)
        {
            MultiContent m = sender as MultiContent;
            m.OnPropertyChanged("ListContent");
        }

        #endregion

        #region ItemContent

        /// <summary>
        /// ItemContent Dependency Property
        /// </summary>
        public object ItemContent
        {
            get { return (object)GetValue(ItemContentProperty); }
            set { SetValue(ItemContentProperty, value); }
        }
        /// <summary>
        /// Identifies the ItemContent Dependency Property.
        /// </summary>
        public static readonly DependencyProperty ItemContentProperty =
            DependencyProperty.Register("ItemContent", typeof(object),
            typeof(MultiContent), new PropertyMetadata(null, OnItemContentPropertyChanged));

        private static void OnItemContentPropertyChanged
          (object sender, DependencyPropertyChangedEventArgs e)
        {
            MultiContent m = sender as MultiContent;
            m.OnPropertyChanged("ItemContent");
        }

        #endregion

        /// <summary>
        ///  Event called when any chart property changes
        ///  Note that this property is not used in the example but is good to have if you plan to extend the class!
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;

        /// <summary>
        ///  Called to invoke the property changed event
        /// </summary>
        /// <param name="propertyName">The property that has changed</param>
        protected void OnPropertyChanged(string propertyName)
        {
            if (propertyName == "ListContent")
            {
                // The ListContent property has been changed, let's update the control!
                this.pnlList.Content = this.ListContent;
            }
            if (propertyName == "ItemContent")
            {
                // The ListContent property has been changed, let's update the control!
                this.pnlItem.Content = this.ItemContent;
            }
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        public MultiContent()
        {
            InitializeComponent();
        }
    }
}

MainPage.xaml:

    <Grid x:Name="LayoutRoot" Background="White">
        <local:MultiContent>
            <local:MultiContent.ListContent>
                <ListBox x:Name="lstListOfStuff" Width="50" Height="50" />
            </local:MultiContent.ListContent>
            <local:MultiContent.ItemContent>
                <TextBox x:Name="txtItemName" Width="50" />
            </local:MultiContent.ItemContent>
        </local:MultiContent>
    </Grid>

这应该能奏效!