WPF省市联动Binding

主要思路：

把省的ItemsSource绑定DataContext，然后给市的ItemsSource绑定到Element（省）的SelectedItem上

xaml

 <Window x:Class="Demo.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         Title="MainWindow" Height="350" Width="525" DataContext="{Binding}">
     <Grid>
         <TextBlock Height="23" HorizontalAlignment="Left" Margin="27,41,0,0" Name="textBlock1" Text="省" VerticalAlignment="Top" />
         <ComboBox Height="23" HorizontalAlignment="Left" Margin="54,36,0,0" Name="cmbProvince" ItemsSource="{Binding}" DisplayMemberPath="Name" VerticalAlignment="Top" Width="120" />
         <TextBlock Height="23" HorizontalAlignment="Left" Margin="207,36,0,0" Name="textBlock2" Text="市" VerticalAlignment="Top" />
         <ComboBox Height="23" HorizontalAlignment="Left" Margin="242,36,0,0" Name="cmbCity" ItemsSource="{Binding SelectedItem.Citys, ElementName=cmbProvince}"  DisplayMemberPath="Name" VerticalAlignment="Top" Width="120" />
     </Grid>
 </Window>

XAML

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;

 namespace Demo
 {
     /// <summary>
     /// MainWindow.xaml 的交互逻辑
     /// </summary>
     public partial class MainWindow : Window
     {
         public List<Province> ProvinceList { set; get; }
         public MainWindow()
         {
             InitializeComponent();
             LoadData();
             this.cmbProvince.DataContext = ProvinceList;
         }

         /// <summary>
         /// 构建数据
         /// </summary>
         public void LoadData()
         {
             ProvinceList = new List<Province>();
             Province bj = new Province();
             bj.Name = "北京";

             bj.Citys = new List<City>();

             City city1 = new City() { Name = "海淀" };
             bj.Citys.Add(city1);

             city1 = new City() { Name = "朝阳" };
             bj.Citys.Add(city1);

             city1 = new City() { Name = "西城" };
             bj.Citys.Add(city1);

             Province sh = new Province() { Name = "上海" };
             sh.Citys = new List<City>();
             city1 = new City() { Name = "静安" };
             sh.Citys.Add(city1);

             city1 = new City() { Name = "徐汇" };
             sh.Citys.Add(city1);

             city1 = new City() { Name = "金山" };
             sh.Citys.Add(city1);

             ProvinceList.Add(bj);
             ProvinceList.Add(sh);
         }
     }
 }

MainWindow.xaml 的交互逻辑

两个类：

 namespace Demo
 {
     public class City
     {
         public string Name { get; set; }

     }
 }

Class City

 using System.Collections.Generic;

 namespace Demo
 {
     public class Province
     {
         public string Name { get; set; }

         public List<City> Citys { get; set; }

     }
 }

Class Province