OnPaint事件

protected override void OnPaint(PaintEventArgs pe)
{
    if (this.pictureBoxState[0x20])
    {
        try
        {
            if (this.WaitOnLoad)
            {
                this.Load();
            }
            else
            {
                this.LoadAsync();
            }
        }
        catch (Exception exception)
        {
            if (ClientUtils.IsCriticalException(exception))
            {
                throw;
            }
            this.image = this.ErrorImage;
        }
    }
    if (this.image != null)
    {
        this.Animate();
        ImageAnimator.UpdateFrames();
        Rectangle rect = (this.imageInstallationType == ImageInstallationType.ErrorOrInitial) ? this.ImageRectangleFromSizeMode(PictureBoxSizeMode.CenterImage) : this.ImageRectangle;
        pe.Graphics.DrawImage(this.image, rect);
    }
    base.OnPaint(pe);
}