医院信息系统点击科室切换科室医生

页面启动：(private void Reg_Load(object sender, EventArgs e))

//获取医生 默认内科的医生
update_combox_doctor(comboBox2.Text.Trim());

封装函数，方便复用

//切换科室， 获取医生信息
public void update_combox_doctor(String officeName)
{
    try
    {
        //连接查询
        //select a.staffID,a.name from  staffInfor a  inner join officeInfor b on a.officeID = b.officeID where b.officeName = '内科'
        string sql_doc = string.Format("select a.staffID,a.name from  staffInfor a  inner join officeInfor b on a.officeID = b.officeID where b.officeName = '{0}'",officeName);
        SqlCommand cmd = new SqlCommand(sql_doc, DBConn.conn);
        DBConn.conn.Open()
        SqlDataReader dr = cmd.ExecuteReader();
        while (dr.Read())
        {
            this.comboBox3.Items.Add("[" + dr[0].ToString() + "]" + dr[1].ToString())
            //显示效果：[181200000]李明
        }
        dr.Close();
    
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message)
    }
    finally
    {
        DBConn.conn.Close();
    }
}

函数使用

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
    // 先清空
    comboBox3.Text = "";
    comboBox3.Items.Clear();
    update_combox_doctor(comboBox2.Text.Trim());
    //comboBox2.Text
}