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) {
}
}
}