TextBox OnPaint 方法没有被调用？

Question

I have use the following code to create a textbox, but the paint method is not triggered at any situation of the textbox. Can you suggest a solution to trigger the OnPaint() ?

public class MyTextBox : TextBox
{
    protected override void OnPaintBackground(PaintEventArgs pevent)
    {
        base.OnPaintBackground(pevent);
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        ControlPaint.DrawBorder(e.Graphics,this.Bounds, Color.Red,ButtonBorderStyle.Solid);
        base.OnPaint(e);
    }

    protected override void OnTextChanged(EventArgs e)
    {
        this.Invalidate();
        this.Refresh();
        base.OnTextChanged(e);
    }
}

Answer 1

OnPaint will not be called on a TextBox by default unless you register it as a self-painting control, by making a call to :

SetStyle(ControlStyles.UserPaint, true);

Answer 2

You need to switch the calls in your OnPaint<\/code>

protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);
    ControlPaint.DrawBorder(e.Graphics, this.Bounds, Color.Red, ButtonBorderStyle.Solid);
}