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>

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);
        }
    }
}

两个类：

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

    }
}

using System.Collections.Generic;

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

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

    }
}