Combox(层)级联(动)显示

本文用于记录在有两个Combox控件时，cbxParent选择项发生变化时，cbxChild跟着改变。

Dictionary<string, string[]> dictParentAndChild = new Dictionary<string, string[]>() {
	{"0",new string[]{"0-0","0-1","0-2","0-3"} },
	{"1",new string[]{"1-0","1-1","1-2","1-3"}},
	{"2",new string[]{"2-0","2-1","2-2","2-3"}},
	{"3",new string[]{"3-0","3-1","3-2","3-3"}},
	{"4",new string[]{"4-0","4-1","4-2","4-3"}}
};
int index = cbxParent.SelectedIndex;
if (index < 0)
{
	return; 
}
string strChildName = dictParentAndChild.Items[index].ToString();
string[] arrChild;
dictParentAndChild.TryGetValue(strChildName,out arrChild);
cbxChild.DataSource = arrChild;