实现效果：
Form1.cs代码
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)
{
}
}
}
更多相关的实现方法大家可以阅读下面的相关内容，感谢大家对服务器之家的支持。
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