C#双缓存.cs

protected override void OnPaint(PaintEventArgs e )

{

    //屏幕外的图像

    Graphics gxOff;



    //要双缓冲的位图

    if (m_bmpOffscreen == null)

    {

        m_bmpOffscreen = new Bitmap(ClientSize.Width, ClientSize.Height);

    }



    gxOff = Graphics.FromImage(m_bmpOffscreen);



    gxOff.Clear(this.BackColor);

    //绘制一些位图

    gxOff.DrawImage(bmpParent, 0, 0, bmpRect, GraphicsUnit.Pixel);



    //边界矩形

    Rectangle rc = this.ClientRectangle;

    rc.Width--;

    rc.Height--;



    //绘制边界

    gxOff.DrawRectangle(new Pen(Color.Black), rc);

    //从内存位图绘制

    e.Graphics.DrawImage(m_bmpOffscreen, 0, 0);



    base.OnPaint( e );

}