WPF：在XmlDataProvider上使用主-从绑定（Master-Detail Binding）

示例程序：

如上程序截图，一目了然典型的主从模式绑定应用，如果里面的数据不是用XML来存储而是已经初始化好的C#对象（比如国家是Country类的对 象，名字是Name属性，Provinces属性保存一个Province集合，代表国家的省/州，Province类包含Name属性代表名 称，Cities属性代表一些列City类对象……）那么主从模式绑定可以很简单的这样写： 

1. 设置最外层DataContext为一系列的“国家”（“国家”集合）

2. 国家ListBox直接绑定

3. 省/州ListBox的ItemsSource为: {Binding Path=Provinces} (或者/Provinces)

4. 城市ListBox的ItemsSource为: {Binding Path=Province/Cities}

（注意所有ListBox的IsSynchronizedWithCurrentItem都设置成True）

但是如果放在Xml数据上，由于绑定上要用到XPath属性而不是Path属性，因此上述传统方案不适用，解决方案就是通过直接绑定所属 ListBox的SelectedItem值，然后再在这个值上进行XPath查询。注意第二层绑定直接用XPath，没有绑定最外层ListBox的 SelectedItem。ListBox代码如下：

<HeaderedContentControl>

    <ListBox ItemsSource="{Binding}"

            DisplayMemberPath="@name"

            IsSynchronizedWithCurrentItem="True"/>

</HeaderedContentControl>

<HeaderedContentControl Header="省/州"

                      Grid.Column="1">

    <ListBox Name="lbxProvince"

            ItemsSource="{Binding XPath=province}"

            DisplayMemberPath="@name"

            IsSynchronizedWithCurrentItem="True"/>

</HeaderedContentControl>

<HeaderedContentControl Header="城市"

                       Grid.Column="2">

    <ListBox DataContext="{Binding ElementName=lbxProvince, Path=SelectedItem}"

            ItemsSource="{Binding XPath=city}"

            IsSynchronizedWithCurrentItem="True"/>

</HeaderedContentControl>

完整的XAML代码

<Window.Resources>

    <XmlDataProvider x:Key="xml" XPath="/countries/country">

        <!-- 示例数据 -->

        <x:XData>

            <countries xmlns="">

                <country name="中国">

                    <province name="陕西">

                        <city>西安</city>

                        <city>宝鸡</city>

                    </province>

                    <province name="山西">

                        <city>太原</city>

                        <city>大同</city>

                    </province>

                    <province name="内蒙古自治区">

                        <city>呼和浩特</city>

                        <city>包头</city>

                        <city>集宁</city>

                    </province>

                    <province name="河北">

                        <city>石家庄</city>

                        <city>保定</city>

                    </province>

                </country>

                <country name="美国">

                    <province name="加利福尼亚">

                        <city>洛杉矶</city>

                        <city>圣迭戈</city>

                    </province>

                    <province name="福罗里达">

                        <city>杰克逊维尔</city>

                        <city>迈阿密</city>

                    </province>

                </country>

            </countries>

        </x:XData>

    </XmlDataProvider>

    <Style TargetType="HeaderedContentControl">

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="HeaderedContentControl">

                    <DockPanel>

                        <Border DockPanel.Dock="Top"

                               Margin="3"

                               CornerRadius="3"

                               Background="DarkRed">

                            <TextBlock Text="{TemplateBinding Header}"

                                      HorizontalAlignment="Center"

                                      Foreground="White"></TextBlock>

                        </Border>

                        <ContentPresenter ContentSource="Content"

                                         ContentTemplate="{TemplateBinding ContentTemplate}"></ContentPresenter>

                    </DockPanel>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>

    <Style TargetType="ListBoxItem">

        <Setter Property="SnapsToDevicePixels" Value="true"/>

        <Setter Property="OverridesDefaultStyle" Value="true"/>

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="ListBoxItem">

                    <Border Name="Border"

                           Padding="2"

                           SnapsToDevicePixels="true">

                        <ContentPresenter />

                    </Border>

                    <ControlTemplate.Triggers>

                        <Trigger Property="IsSelected" Value="true">

                            <Setter TargetName="Border" Property="Background" Value="YellowGreen"/>

                        </Trigger>

                    </ControlTemplate.Triggers>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>

</Window.Resources>

<Grid DataContext="{Binding Source={StaticResource xml}}">

    <Grid.ColumnDefinitions>

        <ColumnDefinition></ColumnDefinition>

        <ColumnDefinition></ColumnDefinition>

        <ColumnDefinition></ColumnDefinition>

    </Grid.ColumnDefinitions>

    <HeaderedContentControl Header="国家">

        <ListBox ItemsSource="{Binding}"

                DisplayMemberPath="@name"

                IsSynchronizedWithCurrentItem="True"></ListBox>

    </HeaderedContentControl>

    <HeaderedContentControl Header="省/州"

                          Grid.Column="1">

        <ListBox Name="lbxProvince"

                ItemsSource="{Binding XPath=province}"

                DisplayMemberPath="@name"

                IsSynchronizedWithCurrentItem="True"></ListBox>

    </HeaderedContentControl>

    <HeaderedContentControl Header="城市"

                           Grid.Column="2">

        <ListBox DataContext="{Binding ElementName=lbxProvince, Path=SelectedItem}"

                ItemsSource="{Binding XPath=city}"

                IsSynchronizedWithCurrentItem="True"></ListBox>

    </HeaderedContentControl>

</Grid>

http://www.cnblogs.com/lonelyxmas/p/3370095.html