.net又一个生成缩略图的方法，不变形,非常好用

 1 /// <summary>  2         /// 为图片生成缩略图 by 何问起 3         /// </summary>  4         /// <param name="phyPath">原图片的路径</param>  5         /// <param name="width">缩略图宽</param>  6         /// <param name="height">缩略图高</param>  7         /// <returns></returns>  8         public System.Drawing.Image GetHvtThumbnail(System.Drawing.Image image, int width, int height) 9         {10           //代码是从开源项目HoverTreeCMS中获取的11           //更多信息请参考：http://hovertree.com/menu/hovertreecms/12             Bitmap m_hovertreeBmp = new Bitmap(width, height);13             //从Bitmap创建一个System.Drawing.Graphics 14             Graphics m_HvtGr = Graphics.FromImage(m_hovertreeBmp);15             //设置  16             m_HvtGr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;17             //下面这个也设成高质量 18             m_HvtGr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;19             //下面这个设成High 20             m_HvtGr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;21             //把原始图像绘制成上面所设置宽高的缩小图 22             Rectangle rectDestination = new Rectangle(0, 0, width, height);23 24             int m_width, m_height;25             if (image.Width * height > image.Height * width)26             {27                 m_height = image.Height;28                 m_width = (image.Height * width) / height;29             }30             else31             {32                 m_width = image.Width;33                 m_height = (image.Width * height) / width;34             }35 36             m_HvtGr.DrawImage(image, rectDestination, 0, 0, m_width, m_height, GraphicsUnit.Pixel);37 38             return m_hovertreeBmp;39         }