学习编程时，在窗体上放了以下6个单选按钮，设置了变量buttonType，不知哪个地方没有设置正确，点击displayButton按钮时没有出现预期效果，说明单选按钮的CheckedChanged事件没有调用，请教各位！
        private MessageBoxButtons buttonType = MessageBoxButtons.RetryCancel;
        private void buttonType_CheckedChanged(object sender, EventArgs e)
        {
            if (sender == ok)
                buttonType = MessageBoxButtons.OK;
            else if (sender == okCancel)
                buttonType = MessageBoxButtons.OKCancel;
            else if (sender == abortRetryIgnore)
                buttonType = MessageBoxButtons.AbortRetryIgnore;
            else if (sender == yesNoCancel)
                buttonType = MessageBoxButtons.YesNoCancel;
            else if (sender == yesNo)
                buttonType = MessageBoxButtons.YesNo;
            else
                buttonType = MessageBoxButtons.RetryCancel;
        }
        private void displayButton_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("this is your custom messagebox", "custom messagebox", buttonType, MessageBoxIcon.Question, 0, 0);
            switch (result)
            {
                case DialogResult.OK:
                    displayLabel.Text = "ok was pressed";
                    break;
                case DialogResult.Cancel:
                    displayLabel.Text = "cancel was pressed";
                    break;
                case DialogResult.Abort:
                    displayLabel.Text = "Abort was pressed";
                    break;
                case DialogResult.Retry:
                    displayLabel.Text = "Retry was pressed";
                    break;
                case DialogResult.Ignore:
                    displayLabel.Text = "Ignore was pressed";
                    break;
                case DialogResult.Yes:
                    displayLabel.Text = "Yes was pressed";
                    break;
                case DialogResult.No:
                    displayLabel.Text = "No was pressed";
                    break;
            }
        }

谢谢回复！我的意思是：放6个单选按钮，在点击某个单选按钮时，要把这个事件用一个变量buttonType反映出来，然后被displayButton_Click函数调用，但是不可能为每个按钮都设置CheckedChanged事件，不知怎么实现好？

问题解决，谢谢5楼！谢谢大家！