asp.net上传图片并同时生成缩略图(2)

        Bitmap tImage = new Bitmap(tWidth, tHeight); 
        Graphics g = Graphics.FromImage(tImage); 
        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法  
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度  
        g.Clear(Color.Transparent); //清空画布并以透明背景色填充  
        g.DrawImage(oImage, new Rectangle(0, 0, tWidth, tHeight), new Rectangle(0, 0, oWidth, oHeight), GraphicsUnit.Pixel); 
        string oFullName = Server.MapPath(".") + "/image/" + "o" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg"; //保存原图的物理路径  
        string tFullName = Server.MapPath(".") + "/image/" + "t" + DateTime.Now.ToShortDateString().Replace("-", "") + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString() + ".jpg"; //保存缩略图的物理路径 
        try 
        { 
            //以JPG格式保存图片  
            oImage.Save(oFullName, System.Drawing.Imaging.ImageFormat.Jpeg); 
            tImage.Save(tFullName, System.Drawing.Imaging.ImageFormat.Jpeg); 
        } 
        catch (Exception ex) 
        { 
            throw ex; 
        } 
        finally 
        { 
            //释放资源  
            oImage.Dispose(); 
            g.Dispose(); 
            tImage.Dispose(); 
        } 
    } 
 
} 

摘自 fengyarongaa