[原]Silverlight两种自定义包含内容（Content)控件的方案

继承ContentControl可以很方便实现包含内容(Content)的控件，方案一：
自定义控件代码如下：

    public class DockPanel : ContentControl
    {
        public DockPanel()
        {
            this.DefaultStyleKey = typeof(DockPanel);
        }
    }

themes/Generic.xaml代码如下：

    <Style TargetType="local:DockPanel">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:DockPanel">
                    <Grid>
                        <Border>
                            <Grid>
                                <ContentPresenter Content="{TemplateBinding Content}" />
                            </Grid>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

引用页面代码：

<UserControl x:Class="SilverlightApplication1.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:cinlap="clr-namespace:SilverlightClassLibrary1;assembly=SilverlightClassLibrary1"
    Width="400" Height="300">
    <Grid x:Name="LayoutRoot" Background="Yellow" Width="400" Height="300" >          
        <cinlap:DockPanel>
            <cinlap:DockPanel.Content>
                <StackPanel Background="Red"/>
            </cinlap:DockPanel.Content>
        </cinlap:DockPanel>
    </Grid>  
</UserControl>

方案二：

自定义控件：

    public class MyContentControl : Control
    {
        public static readonly DependencyProperty ContentPanelProperty =
            DependencyProperty.Register("ContentPanel", typeof(Panel), typeof(MyContentControl), null);

        public MyContentControl()
        {
            this.DefaultStyleKey = typeof(MyContentControl);
        }

        public Panel ContentPanel
        {
            get
            {
                return (Panel)this.GetValue(ContentPanelProperty);
            }
            set
            {
                this.SetValue(ContentPanelProperty, value);
            }
        }
    }

themes/Generic.xaml代码如下：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
                    xmlns:local="clr-namespace:SilverlightClassLibrary1" >
    <Style TargetType="local:MyContentControl">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:MyContentControl">
                    <Grid>
                        <Border>
                            <Grid>                                
                                <ContentPresenter Content="{TemplateBinding ContentPanel}"/>
                            </Grid>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

引用页面代码：

    <Grid x:Name="LayoutRoot" Background="Yellow" Width="400" Height="300" >          
        <cinlap:MyContentControl>
            <cinlap:MyContentControl.ContentPanel>
                <StackPanel Background="Red"/>
            </cinlap:MyContentControl.ContentPanel>
        </cinlap:MyContentControl>
    </Grid>

补充：

Silverlight自带的内容控件中一般使在ContentPresenter时绑定了以下两个属性：

HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"

经试验，定义了这两个属性后，内容元素不能自动缩放，所以在自定义Content控件时，可视自已实际应用运用这两个属性。