【文件属性】：
文件名称：图片放大镜（悬浮在原图上）
文件大小：46KB
文件格式：ZIP
更新时间：2016-09-23 11:33:00
双缓冲画图 控件的paint C#
点击加载图片后，按下鼠标左键并移动鼠标，图片上会悬浮一个显示原图大小的放大区域。就是一个图片放大镜。使用双缓冲技术，解决图片闪烁问题！！
关键代码：
picImage.Paint +=new PaintEventHandler(picImage_Paint);
protected void picImage_Paint(object sender, PaintEventArgs e )
{
if (NotFirstLoad ==true )
{
Bitmap bit = new Bitmap(ZoomIn_Width, ZoomIn_Height);
Graphics g = Graphics.FromImage(bit);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.DrawImage(picImage.Image,
new Rectangle(0, 0, ZoomIn_Width, ZoomIn_Height),
new Rectangle(Convert.ToInt16(ex * Rate - ZoomIn_Width / 2), Convert.ToInt16(ey * Rate - ZoomIn_Height / 2), ZoomIn_Width, ZoomIn_Height),
GraphicsUnit.Pixel);
e.Graphics.DrawImage(bit, ZoomIn_X , ZoomIn_Y, ZoomIn_Width, ZoomIn_Height);
//Graphics g2 = this.picImage.CreateGraphics();
//g2.DrawImage(bit, ZoomIn_X, ZoomIn_Y, ZoomIn_Width, ZoomIn_Height);
//g.Dispose();
}
【文件预览】：
doublebuffer
----doublebuffer.sln(926B)
----doublebuffer()
--------frmViewPicture.Designer.cs(3KB)
--------bin()
--------Program.cs(502B)
--------frmViewPicture.resx(6KB)
--------obj()
--------doublebuffer.csproj(4KB)
--------frmViewPicture.cs(7KB)
--------Properties()
----doublebuffer.suo(17KB)