我最近在遍个小程序，可是好像combobox不会用，下拉菜单的第一个有效，后面的都没用。。。
 private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox1.Text=="+(plus)")
            {
                label4.Text = "+";
            }
            else  if (comboBox1.Text == "-(minus)")
            {
                label4.Text="-";
            }
            else if (comboBox1.Text == "*(multiply)")
            {
                label4.Text = "*";


            }
            else if (comboBox1.Text == "/(divide)")
            {
                label4.Text = "/";
            }
        }

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    switch()
    {
        case 0:
            this.label4.Text="+";
            break;
        case 1:
            ...
    }
}

直接用SelectedIndex不是更好?

LS的  我刚刚学了2个礼拜的课   而且是全英文授课的  所以糊里糊涂的  几个月前是个高中生。。。。所以请您能简单讲下他的用法么？谢谢。。。看来以后我要经常拜访贵坛了  呵呵

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox1.SelectedIndex==0)
            {
                label4.Text = "+";
            }
            else  if (comboBox1.SelectedIndex== 1)
            {
                label4.Text="-";
            }
            else if (comboBox1.SelectedIndex== 2)
            {
                label4.Text = "*";
            }
            else if (comboBox1.SelectedIndex== 3)
            {
                label4.Text = "/";
            }
        }

呃  好的  十分感谢