Button trigger event GotFocus repeattly

问题

I have created a set of button and attach Click event and GotFocus event to them.

for (int i = 0; i < NumberOfQuestion; i++)
        {
            RadButton button = new RadButton();
            // radButton1
            // 
            button.Anchor = AnchorStyles.None;
            button.Font = new Font("Segoe UI", 8.25F, FontStyle.Bold);
            button.Location = new Point(65 * i + 15, 10);
            button.Name = "btn_cauhoi" + (i + 1);
            button.Size = new Size(60, 35);
            button.TabIndex = 1 + i;
            button.Text = "Câu " + (i + 1);

            button.Tag = (i + 1);

            button.Click += Button_Click;
            button.GotFocus += Button_Click; ;

            // 

            panel_nut_cauhoi.Controls.Add(button);
        }

   private void Button_Click(object sender, EventArgs e)
    {
        var button = (RadButton)sender;
        var index = (int)button.Tag;
        MessageBox.Show(index.ToString());
    }

It triggers Click event correctly but with GotFocus event it trigger repeatly.

Somebody helps me, please.

Thanks in advances.

回答1:

When you click ok on message box it loose focus and get focus again. So if you delete MessageBox.Show() you will see its gonna trigger only one time, so you can test code like below, you will see the name of the button as btn_cauhoi1 or btn_cauhoi2 or btn_cauhoi3 up to which button you do click, it means its gonna trigger only one time.

        var button = (RadButton)sender;
        var index = (int)button.Tag;
        //MessageBox.Show(index.ToString());
        this.Text = button.Name;

来源：https://stackoverflow.com/questions/41311043/button-trigger-event-gotfocus-repeattly