Question

I’ve added a custom border to the labels in one of my application forms as follows:

    private void ColorMe(PaintEventArgs e)
    {
        Color myColor = Color.FromArgb(104, 195, 198);
        Pen myPen = new Pen(myColor, 1);
        e.Graphics.DrawRectangle(myPen,
        e.ClipRectangle.Left,
        e.ClipRectangle.Top,
        e.ClipRectangle.Width - 1,
        e.ClipRectangle.Height - 1);
        base.OnPaint(e);
    }

    private void lblDisbs_Paint(object sender, PaintEventArgs e)
    {
        ColorMe(e);
    }

Which works nicely. All I have to do it put ColorMe(e) in the Paint Event of each label.

However I want to use this method on all forms throughout the whole application. I tried putting my ColorMe() method in a class to call it from multiple forms that way, but it does not work, saying that ‘base has no OnPaint event’.

How should I make this method available throughout the whole application?

Answer 1

Create class LabelWithBorder derive it from Label, override the OnPaint method.

public class LabelWithBorder : Label {
  protected override void OnPaint(PaintEventArgs e) {
    ColorMe(e);
  }
}

Replace all WinForms labels in your app with your label.