6.C#WinForm基础城市选择器

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;

namespace 省市选择器
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
comboBox2.Items.Clear();//清空旧数据
string 省 = Convert.ToString(comboBox1.SelectedItem);
if (省 =="河南")
{
comboBox2.Items.Add("郑州");
comboBox2.Items.Add("安阳");
comboBox2.Items.Add("洛阳");
}
if (省 == "山东")
{
comboBox2.Items.Add("潍坊");
comboBox2.Items.Add("济宁");
comboBox2.Items.Add("青岛");
}
if (省 == "辽宁")
{
comboBox2.Items.Add("沈阳");
comboBox2.Items.Add("鞍山");
comboBox2.Items.Add("本溪");
}
}
}
}