WPF:ComboBox使用XmlDataProvider做级联

程序功能：

　　使用ComboBox做级联，数据源为XML文件，适合小数据量呈现

程序代码：

<Window x:Class="WpfApplication1.LayouTest"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:core="clr-namespace:System;assembly=mscorlib"
        xmlns:local="clr-namespace:WpfApplication1"
        Title="LayouTest" Height="628.125" Width="596.484">
    <Canvas>
        <Canvas.Resources>
            <!--Create list of enumeration values-->
            <XmlDataProvider x:Key="xml" XPath="/countries/country" Source="ParamConfig.xml">
            </XmlDataProvider>
        </Canvas.Resources>

              <Label Content="XML" Canvas.Left="15" Canvas.Top="128"/>
        <ComboBox Name="cmboxCountry" Canvas.Left="68" Canvas.Top="128" Width="120"
                  ItemsSource="{Binding Source={StaticResource xml}}" DisplayMemberPath="@name"
                  IsSynchronizedWithCurrentItem="True"
                  SelectionChanged="cmboxCountry_SelectionChanged"/>
        <ComboBox Name="comboProvince" Canvas.Left="208" Canvas.Top="128" Width="120"
                  DataContext="{Binding ElementName=cmboxCountry, Path=SelectedItem}"
                  IsSynchronizedWithCurrentItem="True"
                  ItemsSource="{Binding XPath=province}"
                  DisplayMemberPath="@name"/>
        <ComboBox Canvas.Left="345" Canvas.Top="128" Width="120"
                  DataContext="{Binding ElementName=comboProvince, Path=SelectedItem}"
                  IsSynchronizedWithCurrentItem="True"
                  ItemsSource="{Binding XPath=city}"/>
    </Canvas>
</Window>

XML文件：

<?xml version="1.0" encoding="utf-8" ?>
<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>

注意要点：

　　使用XmlDataProvider一定要注意级联绑定数据不是Path而是XPath

参考文章：

非常感激http://www.cnblogs.com/mgen/archive/2011/06/19/2084553.html#commentform