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

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

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C#

MainWindow.xaml 的交互逻辑

1. using System;
   
2. using System.Collections.Generic;
   
3. using System.Linq;
   
4. using System.Text;
   
5. using System.Windows;
   
6. using System.Windows.Controls;
   
7. using System.Windows.Data;
   
8. using System.Windows.Documents;
   
9. using System.Windows.Input;
   
10. using System.Windows.Media;
    
11. using System.Windows.Media.Imaging;
    
12. using System.Windows.Navigation;
    
13. using System.Windows.Shapes;
    
14. 
    
15. namespace Demo
    
16. {
    
17.     /// <summary>
    
18.     /// MainWindow.xaml 的交互逻辑
    
19.     /// </summary>
    
20.     public partial class MainWindow : Window
    
21.     {
    
22.         public List<Province> ProvinceList { set; get; }
    
23.         public MainWindow()
    
24.         {
    
25.             InitializeComponent();
    
26.             LoadData();
    
27.             this.cmbProvince.DataContext = ProvinceList;
    
28.         }
    
29. 
    
30.         /// <summary>
    
31.         /// 构建数据
    
32.         /// </summary>
    
33.         public void LoadData()
    
34.         {
    
35.             ProvinceList = new List<Province>();
    
36.             Province bj = new Province();
    
37.             bj.Name = "北京";
    
38. 
    
39.             bj.Citys = new List<City>();
    
40. 
    
41.             City city1 = new City() { Name = "海淀" };
    
42.             bj.Citys.Add(city1);
    
43. 
    
44.             city1 = new City() { Name = "朝阳" };
    
45.             bj.Citys.Add(city1);
    
46. 
    
47.             city1 = new City() { Name = "西城" };
    
48.             bj.Citys.Add(city1);
    
49. 
    
50.             Province sh = new Province() { Name = "上海" };
    
51.             sh.Citys = new List<City>();
    
52.             city1 = new City() { Name = "静安" };
    
53.             sh.Citys.Add(city1);
    
54. 
    
55.             city1 = new City() { Name = "徐汇" };
    
56.             sh.Citys.Add(city1);
    
57. 
    
58.             city1 = new City() { Name = "金山" };
    
59.             sh.Citys.Add(city1);
    
60. 
    
61.             ProvinceList.Add(bj);
    
62.             ProvinceList.Add(sh);
    
63.         }
    
64.     }
    
65. }
    

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Class City

1. namespace Demo
   
2. {
   
3.     public class City
   
4.     {
   
5.         public string Name { get; set; }
   
6. 
   
7.     }
   
8. }

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Class Province

1. using System.Collections.Generic;
   
2. 
   
3. namespace Demo
   
4. {
   
5.     public class Province
   
6.     {
   
7.         public string Name { get; set; }
   
8. 
   
9.         public List<City> Citys { get; set; }
   
10. 
    
11.     }
    
12. }
    

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http://www.cnblogs.com/9527y/p/3657732.html

{:3_65:}虽然看不懂，但抢个沙发还是可以的，且坐且珍惜