如何在将jpeg文件存储到sql server数据库之前减小它的大小？

Question

如何在将jpeg文件存储到sql server数据库之前减小它的大小？

public byte[] ResizeImageFile(byte[] imageFile, int targetSize) // Set targetSize to 1024
        {
            using (System.Drawing.Image oldImage = System.Drawing.Image.FromStream(new MemoryStream(imageFile)))
            {
                Size newSize = new Size(50, 100);
                using (Bitmap newImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format24bppRgb))
                {
                    using (Graphics canvas = Graphics.FromImage(newImage))
                    {
                        canvas.SmoothingMode = SmoothingMode.AntiAlias;
                        canvas.InterpolationMode = InterpolationMode.HighQualityBicubic;
                        canvas.PixelOffsetMode = PixelOffsetMode.HighQuality;
                        canvas.DrawImage(oldImage, new Rectangle(new Point(0, 0), newSize));
                        MemoryStream m = new MemoryStream();
                        newImage.Save(m, ImageFormat.Jpeg);
                        return m.GetBuffer();
                    }
                }
            }
        }

我在memorystream构造函数中收到错误，指出无效参数。

Answer 1

使用System.Drawing命名空间中的实用程序调整其大小 有几个选项，快速谷歌给了我这三个：

http://weblogs.asp.net/gunnarpeipman/archive/2009/04/02/resizing-images-without-loss-of-quality.aspx

http://weblogs.asp.net/bleroy/archive/2010/05/03/the-fastest-way-to-resize-images-from-asp-net-and-it-s-more-supported-ish.aspx

http://www.4guysfromrolla.com/articles/012203-1.aspx