C# winfrom省市联动

1、打开VS 新建一个winform窗体项目，在winfrom上加上两个label和combobox

4、当combobox1索引发生改变时，conbobox2依据combobox1索引进行数据的绑定。这样就使得两个combobox枷讹般身相关联在一起。private void comboBoxEx1_SelectedIndexChanged(object sender, EventArgs e) { string[][] str={new string[]{"杭州市","宁波市"}, new string[]{"南京市","南通市"}}; switch (comboBoxEx1.SelectedIndex) { case 0: comboBoxEx2.DataSource = str[comboBoxEx1.SelectedIndex]; break; case 1: comboBoxEx2.DataSource = str[comboBoxEx1.SelectedIndex]; break; } }

6、如果是三级联动的话，在第二个Conbo幞洼踉残Box选择SelectedIndexChanged事件，添加如下代码，就可以实现第二个 ConboBox和第三个ConboBox的关联。 switch (comboBox2.SelectedIndex) { case 0: comboBox3.DataSource = str[comboBox23.SelectedIndex]; break; case 1: comboBox3.DataSource = str[comboBox23.SelectedIndex]; break; case 2: comboBox3.DataSource = str[comboBox23.SelectedIndex]; break; }