请问GDI+的双缓冲到底如何实现，有没有代码给我参考下？？？

Question

请问GDI+的双缓冲到底如何实现，有没有代码给我参考下？？？

Answer 1

使用，      
SetStyle(System.Windows.Forms.ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(System.Windows.Forms.ControlStyles.DoubleBuffer, true);

Answer 2

激活双缓冲：
方法一：
this.SetStyle(ControlStyles.OptimizedDoubleBuffer,true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);
（OptimizedDoubleBuffer替换了之前版本的DoubleBuffer，除非为了兼容性，应该避免使用DoubleBuffer）
方法二：
在窗体设计器中将窗体的DoubleBuffered属性设为true。（默认为false）。
这是由Control基类实现的，所以应该将所有自定义控件和用户控件的DoubleBuffered属性设置为true：
base.DoubleBuffered=true;

Answer 3

 class Clock
    {
        Graphics g;
        Control p;
        Image backGround;
        Image secHand;
        Image minHand;
        Image houHand;
        Thread thr;
        public Clock()
        {            SetSkin();
            thr = new Thread(new ThreadStart(Draw));
        }
        void SetSkin()
        {
            backGround = Skin.clock_Bg;// Resource1.BackGround; //Image.FromFile(Setting.Clock.ClockBackGround);
            secHand = Skin.clock_SHand;//Resource1.SecoundHand; //Image.FromFile(Setting.Clock.SecoundHand );
            minHand = Skin.clock_MHand; //Resource1.MinutHand; //Image.FromFile(Setting.Clock.MinuteHand );
            houHand = Skin.clock_HHand;//Resource1.HourHand;// Image.FromFile(Setting.Clock.HourHand);
        }
        public Graphics SetGraphic
        {
            set
            {
                g = value;
            }
        }
        public Control SetPanel
        {
            set
            {
                p = value;
                p.Width = backGround.Width;
                p.Height  = backGround.Height;
            }
        }
        public void ModifySkin()
        {
            backGround = Skin.clock_Bg;// Resource1.BackGround; //Image.FromFile(Setting.Clock.ClockBackGround);
            secHand = Skin.clock_SHand;//Resource1.SecoundHand; //Image.FromFile(Setting.Clock.SecoundHand );
            minHand = Skin.clock_MHand; //Resource1.MinutHand; //Image.FromFile(Setting.Clock.MinuteHand );
            houHand = Skin.clock_HHand;//Resource1.HourHand;// Image.FromFile(Setting.Clock.HourHand);
        }
        public void Dispose()
        {
            thr.Abort ();
        }
        public void BeginDraw()
        {
            thr.Start();
        }
        void Draw()
        {
            if (p != null && g != null)
            {
                int totalTime = 0;
                int secCount = DateTime.Now.Second ;
                int minCount = DateTime.Now.Minute ;
                int hourCount = ((DateTime.Now.Hour));
                do
                {                    int timeSpan =1000;          
                    SetSkin();
                    Point center = new Point(p.Width / 2, p.Height / 2);
                    Graphics buffer ;
                    //背景
                    Bitmap backGroundBit = new Bitmap(p.Width, p.Height);
                    buffer = Graphics.FromImage(backGroundBit);
                    buffer.Clear(Setting.Clock.MakeTransparentColor);
                    buffer.DrawImage(backGround, new Rectangle(center.X - backGround.Width / 2, center.Y - backGround.Height / 2, backGround.Width, backGround.Height), new Rectangle(0, 0, backGround.Width, backGround.Height), GraphicsUnit.Pixel);
                    buffer.Dispose();
                    
            
                    
                    //时针
                    buffer = Graphics.FromImage(backGroundBit);
                    buffer.TranslateTransform(center.X, center.Y);
                    buffer.RotateTransform((float)hourCount * 360f / 12f +180 );
                    buffer.TranslateTransform(0, -10);
                    buffer.DrawImage(houHand, 0 ,0);
                    buffer.Dispose();
                    //分针
                    buffer = Graphics.FromImage(backGroundBit);
                    buffer.TranslateTransform(center.X, center.Y);
                    buffer.RotateTransform((float)minCount * 6+186  );
                    buffer.TranslateTransform(0, -10);
                    buffer.DrawImage(minHand, 0,0 );
                    buffer.Dispose();
                    //秒针
                    buffer = Graphics.FromImage(backGroundBit);
                    buffer.TranslateTransform(center.X, center.Y);
                    buffer.RotateTransform(((float)secCount) * 6 +186 );
                    buffer.TranslateTransform(0, -10);
                    buffer.DrawImage(secHand, 0, 0 );                   
                    buffer.Dispose();
                                     
                    
                    //输出时间
    
                    Font font = new Font("Arial", 12, FontStyle.Bold);
                    SizeF size = g.MeasureString(DateTime.Now.ToLongTimeString(), font);
                    Bitmap wordsBit = new Bitmap((int)size.Width+1, (int)size.Height+1);
                    buffer = Graphics.FromImage(wordsBit);                  
                    SolidBrush brush;
                    brush = new SolidBrush(Color.White);
                    buffer.DrawString(DateTime.Now.ToLongTimeString(), font, brush, new PointF(1, 1));
                    //buffer.TranslateTransform(center.X, center.Y);
                    buffer.Dispose();                  
                    brush = new SolidBrush(Color.Black );
                    int r =p.Width/2 ;
                    Bitmap numBit = new Bitmap(r*2, r*2);
                    buffer = Graphics.FromImage(numBit);
                    buffer.TranslateTransform(r ,r);
                    for (int i = 0; i < 12; i++)
                    {
                        PointF pp = new PointF(-buffer.MeasureString((i + 1).ToString(), font).Width / 2, -r);
                        buffer.RotateTransform(30);
                        buffer.DrawString((i+1).ToString(), font, brush,pp );
                    }
                    buffer.Dispose ();
                  
                    //合成
                    g.DrawImage(backGroundBit, new Point(0, 0));
                    g.DrawImage(wordsBit, new PointF(center.X - size.Width / 2, center.Y + 12));
                    g.DrawImage(numBit, new Point(0, 0));                    wordsBit.Dispose();
                    backGroundBit.Dispose();
                  
                    totalTime++;                    secCount = DateTime.Now.Second;
                    minCount = DateTime.Now.Minute;
                    hourCount = ((DateTime.Now.Hour));                    thr.Join(timeSpan);                         }
                while (true);
            }            
        }
    }
Draw里面就是双缓冲。看看吧。。写的一个时钟
写的烂。。见笑了。。