按Tab键并单击按钮时按钮周围的恼人边框

Question

I get this very annoying border when pressing tab and the clicking the button

I've tried

 foreach (Control x in this.Controls)
 {
   if (x is Button)
            {
                Button newbut = (Button)x;
                newbut.FlatStyle = FlatStyle.Flat;
                newbut.FlatAppearance.BorderColor = Color.FromArgb(0, 255, 255, 255);
                newbut.FlatAppearance.BorderSize = 0;
                newbut.TabStop = false;
            }
        }

And I've also tried doing adding an event on Keydown and not allowing to press the tab key but nothing has worked so far.

this is example of the border that keeps popping up

Answer 1

通过生成自己的按钮类和编辑designer.cs文件来修复

Answer 2

If you do not want custom buttons, you can shift focus to another control once finished, this prevents the rectangle from showing. You could place a dummy control out of view and shift fucus to this.

    private void btnDoSomething_Click(object sender, EventArgs e)
    {
        myDummyControl.Focus();

        MessageBox.Show("This still executes even though we have lost focus");

        // If you are decoupling your code from the UI, this becomes second nature quickly as it becomes part of your control handling.
    }

Also you can stop the control from getting Tab focus my setting it's TabStop property tp false, do this in the buttons Paint event.

If you have many buttons, you can just point them to the same event handler (On_Paint).

    private void On_Paint(object sender, PaintEventArgs e)
    {
        Button thisButton = sender as Button;
        thisButton.TabStop = false;
    }