C#中comboBox实现三级联动

给大家分享了C#中comboBox实现三级联动的全部代码，代码经过测试，有兴趣的朋友跟着做一下。

实现效果：

C#中comboBox实现三级联动

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)

									 {

									 }

									 }

									}