实现效果：
Form1.cs代码
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Collections;
namespace Select
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Hashtable province = new Hashtable();
Hashtable city = new Hashtable();
private void Province()
{
province.Add("云南省",new string[] {"昆明市","玉溪市" });
province.Add("四川省", new string[] { "成都市", "绵阳市" });
city.Add("昆明市",new string[] {"盘龙区","五华区" });
city.Add("玉溪市",new string[] {"红塔区","。。。区" });
city.Add("成都市", new string[] { "。。。区", "。。。区" });
city.Add("绵阳市", new string[] { "...区", "...区" });
}
private void Form1_Load(object sender, EventArgs e)
{
Province();
foreach (string str in province.Keys)
{
comboBox1.Items.Add(str);
}
foreach (string str in city.Keys)
{
comboBox2.Items.Add(str);
}
comboBox1.SelectedIndex=0;
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
string[] citys = province[comboBox1.Text] as string[];
comboBox2.Items.Clear();
foreach (string s in citys)
{
comboBox2.Items.Add(s);
}
comboBox2.SelectedIndex = 0;
}
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
string[] citys = city[comboBox2.Text] as string[];
comboBox3.Items.Clear();
foreach (string str in citys)
{
comboBox3.Items.Add(str);
}
comboBox3.SelectedIndex = 0;
}
private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
}
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