C#中comboBox实现三级联动

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，感谢大家对的支持。

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