C#手工双缓冲技术用法实例分析

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace advanced_drawing
{
  public partial class Form19 : Form
  {
    BufferedGraphicsContext bufferContext;
    Bitmap gif = new Bitmap(@"d:/我的文档/桌面/ico/a.GIF");
    public Form19()
    {
      InitializeComponent();
      bufferContext = new BufferedGraphicsContext();
      bufferContext.MaximumBuffer = this.ClientRectangle.Size;
    }
    void gif_FrameChanged(object sender, EventArgs e)
    {
      Graphics g = this.CreateGraphics();
      BufferedGraphics frame = bufferContext.Allocate(g, this.ClientRectangle);
      ImageAnimator.UpdateFrames(gif);
      frame.Graphics.DrawImage(gif, this.ClientRectangle);
      frame.Render();
    }
    private void Form19_FormClosing(object sender, FormClosingEventArgs e)
    {
      bufferContext.Dispose();
    }
    private void Form19_Paint(object sender, PaintEventArgs e)
    {
      if (ImageAnimator.CanAnimate(gif))
      {
        ImageAnimator.Animate(gif, gif_FrameChanged);
      }
    }
  }
}