WPF:ComboBox使用XmlDataProvider做级联

时间：2023-03-10 01:46:15
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

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