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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