C# Winform工程省市县三级行政区联动 --XML

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Web;
using System.Xml;
using System.Runtime.Serialization;
using System.IO;
using System.Net;

namespace ProcessBarTest
{
public partial class Form2 : Form
{
public XmlDocument Provincedoc;
public XmlDocument Citydoc;
public XmlDocument Districtdoc;

public XmlElement ProvincerootElem;
public XmlElement CityrootElem;
public XmlElement DistrictrootElem;

public XmlNodeList ProvinceNodes;
public XmlNodeList CityNodes;
public XmlNodeList DistrictNodes;

public string ProvinceName;
public string ProvinceID;
public string CityName;
public string CityID;

public Form2()
{
InitializeComponent();
Provincedoc = new XmlDocument();
Provincedoc.Load(System.Windows.Forms.Application.StartupPath + "/全国省市区数据库/Provinces.xml");    //加载Xml文件
ProvincerootElem = Provincedoc.DocumentElement;   //获取根节点
ProvinceNodes = ProvincerootElem.GetElementsByTagName("Province"); //获取Provinces子节点集合

Citydoc = new XmlDocument();
Citydoc.Load(System.Windows.Forms.Application.StartupPath + "/全国省市区数据库/Cities.xml");    //加载Xml文件
CityrootElem = Citydoc.DocumentElement;   //获取根节点
CityNodes = CityrootElem.GetElementsByTagName("City"); //获取Cities子节点集合

Districtdoc = new XmlDocument();
Districtdoc.Load(System.Windows.Forms.Application.StartupPath + "/全国省市区数据库/Districts.xml");    //加载Xml文件
DistrictrootElem = Districtdoc.DocumentElement;   //获取根节点
DistrictNodes = DistrictrootElem.GetElementsByTagName("District"); //获取Cities子节点集合

foreach (XmlNode Provincenode in ProvinceNodes)
{
string strProvinceName = ((XmlElement)Provincenode).GetAttribute("ProvinceName");   //获取name属性值
string strProvinceID = ((XmlElement)Provincenode).GetAttribute("ID");
comboBox_sheng.Items.Add(strProvinceName);
}
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
ProvinceName = comboBox_sheng.SelectedItem.ToString();
comboBox_xian.Items.Clear();
comboBox_shi.Items.Clear();
foreach (XmlNode Provincenode in ProvinceNodes)
{
if (((XmlElement)Provincenode).GetAttribute("ProvinceName").Equals(comboBox_sheng.SelectedItem.ToString()))
{
ProvinceID = ((XmlElement)Provincenode).GetAttribute("ID");
break;
}
}
foreach (XmlNode Citynode in CityNodes)
{
if (((XmlElement)Citynode).GetAttribute("PID").Equals(ProvinceID))
{
string strCityName = ((XmlElement)Citynode).GetAttribute("CityName");
comboBox_shi.Items.Add(strCityName);
}
}
}

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
CityName = comboBox_shi.SelectedItem.ToString();
comboBox_xian.Items.Clear();
foreach (XmlNode Citynode in CityNodes)
{
if (((XmlElement)Citynode).GetAttribute("CityName").Equals(CityName) && ((XmlElement)Citynode).GetAttribute("PID").Equals(ProvinceID))
{
CityID = ((XmlElement)Citynode).GetAttribute("ID");
break;
}
}
foreach (XmlNode Districtnode in DistrictNodes)
{
if (((XmlElement)Districtnode).GetAttribute("CID").Equals(CityID))
{
string strDistrictName = ((XmlElement)Districtnode).GetAttribute("DistrictName");   //获取name属性值
comboBox_xian.Items.Add(strDistrictName);
}
}
}

private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}