WPF-省市县3级联动（C#数据自动绑定，无需手动）

using Baolaitong.baseService.ViewModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;

namespace Baolaitong.WpfShellPlugin.Content
{
    /// 

    /// AreaSelect.xaml 的交互逻辑
    /// 

    public partial class AreaSelect : UserControl INotifyPropertyChanged
    {

        private IList _provinces = new List（）;

        public static readonly DependencyProperty ProvinceProperty = DependencyProperty.Register（“Province“ typeof（string） typeof（AreaSelect） new frameworkPropertymetadata（string.Empty））;
        public static readonly DependencyProperty CityProperty = DependencyProperty.Register（“City“ typeof（string） typeof（AreaSelect） new frameworkPropertymetadata（string.Empty））;
        public static readonly DependencyProperty CountyProperty = DependencyProperty.Register（“County“ typeof（string） typeof（AreaSelect） new frameworkPropertymetadata（string.Empty））;


        public IList Provinces
        {
            get
            {
                return _provinces;
            }
            set
            {
                _provinces.Clear（）;
                if （value != null）
                {
                    foreach （Province province in value）
                    {
                        _provinces.Add（province）;
                    }
                }
            }
        }
        
        public AreaSelect（）
        {
            InitializeComponent（）;
            this.Content.DataContext = this;
            this.PropertyChanged += SelectedArea_PropertyChanged;
        }

        private void SelectedArea_PropertyChanged（object sender PropertyChangedEventArgs e）
        {
            Console.WriteLine（Province + “ “ + City + “ “ + County）;
        }


        private string _province;
        private string _city;
        private string _county;

        public string Province
        {
            get { return _province; }
            set
            {
                _province = value;
                _city = string.Empty;
                if （PropertyChanged != null）
                {
                    PropertyChanged.Invoke（this new PropertyChangedEventArgs（“Province“））;
                }
            }
        }
        public string City
        {
            get { return _city; }
            set
            {
                _city = value;
                _county = string.Empty;
                if （PropertyChanged != null）
                {
                    PropertyChanged.Invoke（this new PropertyChangedEventArgs（“City“））;
                }
            }
        }
        public string County
        {
            get { return _county; }
            set
            {
                _county = value;
                if （PropertyChanged !