C#中實現RadioButtonList

製作時間：2009-9-10 8：00-9：30
製作地點：北大青鳥公用機房

目的：
  1.用軟編碼的方式,在一組選項按鈕中,找到選中的選項按鈕的Text

   private void btnCheck_Click(object sender, EventArgs e)
        {
            bool flag = false;//如果為true表示有被選中的單選按扭
            string option = string.Empty;//接受被選中的單選按扭的Text
            //迴圈遍曆群組方塊中所有的單選按扭
            //如果有被選中的，則得到單選按扭的Text
            foreach (Control control in grpRadios.Controls)
            {
                RadioButton radio = control as RadioButton;
                if (radio != null && radio.Checked)
                {
                    flag = true;
                    option = radio.Text;
                    MessageBox.Show(option);
                }
            }
            if (!flag)
            {
                MessageBox.Show("請選擇一個單選按扭！","提示",MessageBoxButtons.OK);
                return;
            }
        }
    2.可以專門用一個群組方塊 盛放選項按鈕,則遍曆的時候直接Radio,而不用類型轉換了
    private void btnCheck_Click(object sender, EventArgs e)
        {
            bool flag = false;
            string option = string.Empty;
            foreach (Radio radio in grpRadios.Controls)//這裡用Radio
            {

                if (radio != null && radio.Checked)
                {
                    flag = true;
                    option = radio.Text;
                    MessageBox.Show(option);
                }
            }
            if (!flag)
            {
                MessageBox.Show("請選擇一個單選按扭！","提示",MessageBoxButtons.OK);
                return;
            }
        }
    3.進一步簡化,不需要用flag來標識是否選中選項按鈕,直接用message判斷
        private string GetRadioValueOfGroupBox(Control.ControlCollection controls)
        {
            string message = string.Empty;
            foreach (RadioButton radio in controls)
            {
                if (radio != null && radio.Checked)
                {
                    message = radio.Text;
                }
            }
            return message;
        }