.net又一个生成缩略图的方法，不变形,非常好用

生成缩略图是一个十分常用功能，找到了一个方法，重写部分代码，实用又好用，.net又一个生成缩略图的方法，不变形

 /// <summary>
         /// 为图片生成缩略图 by 何问起
         /// </summary>
         /// <param name="phyPath">原图片的路径</param>
         /// <param name="width">缩略图宽</param>
         /// <param name="height">缩略图高</param>
         /// <returns></returns>
         public System.Drawing.Image GetHvtThumbnail(System.Drawing.Image image, int width, int height)
         {
           //代码是从开源项目HoverTreeCMS中获取的
           //更多信息请参考：http://hovertree.com/menu/hovertreecms/
             Bitmap m_hovertreeBmp = new Bitmap(width, height);
             //从Bitmap创建一个System.Drawing.Graphics
             Graphics m_HvtGr = Graphics.FromImage(m_hovertreeBmp);
             //设置
             m_HvtGr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
             //下面这个也设成高质量
             m_HvtGr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
             //下面这个设成High
             m_HvtGr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
             //把原始图像绘制成上面所设置宽高的缩小图
             Rectangle rectDestination = new Rectangle(, , width, height);

             int m_width, m_height;
             if (image.Width * height > image.Height * width)
             {
                 m_height = image.Height;
                 m_width = (image.Height * width) / height;
             }
             else
             {
                 m_width = image.Width;
                 m_height = (image.Width * height) / width;
             }

             m_HvtGr.DrawImage(image, rectDestination, , , m_width, m_height, GraphicsUnit.Pixel);

             return m_hovertreeBmp;
         }