我要评论实现效果：
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)
{
}
}
}
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