Question

C#中如何使用Combox? 达到的效果：有两个combox,1和2,1作为主关键字，作为次关键字

譬如说combox1选择"数学"时，combox2中添加“123，456”，选择"语文"时，combox2中添加“冯骥才，舒淇”什么的。
哪位大侠指点下！！谢谢！
我是这么写的：
private void Form1_Load(object sender, EventArgs e)
{
this.comboBox1.Items.Add("数学");
this.comboBox1.Items.Add("语文");
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (this.comboBox1.SelectedIndex)
{
case 0:
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("123");
this.comboBox2.Items.Add("456");
break;

case 1:
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("莎士比亚");
this.comboBox2.Items.Add("冯骥才");
break;
default:
MessageBox.Show("出错了！");
break;
}
测试的时候combox2总是获取不到值。
怎么修改呢？

Answer 1

我测试了的，直接复制过去就ok，有问题找我。
private void Form1_Load(object sender, EventArgs e)
{
comboBox1.Items.Clear();
comboBox1.Items.Add("---请选择---");
comboBox1.Items.Add("数学");
comboBox1.Items.Add("语文");
comboBox1.SelectedIndex = 0;//设置第一行的值默认选中
}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (this.comboBox1.SelectedIndex)
{
case 0:
this.comboBox2.Items.Clear();
comboBox2.Text= "";
break;
case 1:
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("123");
this.comboBox2.Items.Add("456");
comboBox2.SelectedIndex = 0;//设置第一行的值默认选中
break;
case 2:
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("莎士比亚");
this.comboBox2.Items.Add("冯骥才");
comboBox2.SelectedIndex = 0;//设置第一行的值默认选中
break;
default:
MessageBox.Show("出错了！");
break;
}
}

Answer 2

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (this.comboBox1.Text)
{
case "数学":
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("123");
this.comboBox2.Items.Add("456");
break;

case “语文”:
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("莎士比亚");
this.comboBox2.Items.Add("冯骥才");
break;
default:
MessageBox.Show("出错了！");
break;
}
这样呢，你试试

Answer 3

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (this.comboBox1.Text)
{
case "数学":
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("123");
this.comboBox2.Items.Add("456");
break;

case “语文”:
this.comboBox2.Items.Clear();
this.comboBox2.Items.Add("莎士比亚");
this.comboBox2.Items.Add("冯骥才");
break;
default:
MessageBox.Show("出错了！");
break;