怎样把图片缩小上传到服务器?

Question

怎样把图片缩小上传到服务器

Answer 1

图片先上传，再等比例缩放
http://topic.csdn.net/u/20090927/12/c84daad0-1310-4d10-bdf8-77baacf652be.html

Answer 2

        DirectoryInfo dir = new DirectoryInfo(Server.MapPath("~/admin/news"));
        FileInfo[] files = dir.GetFiles();        foreach (FileInfo f in files)
        {
            if (f.Name.ToLower() == "thumbs.db")
                continue;            try
            {
                string name = f.Name.Substring(0,f.Name.LastIndexOf("."));
                string extension = f.Name.Substring(f.Name.LastIndexOf(".") + 1);                System.Drawing.Image img = System.Drawing.Image.FromFile(Server.MapPath("~/admin/news/") + f.Name);
                
                float scale = 250.0f / Math.Max(img.Width, img.Height);
                int width = Convert.ToInt32(img.Width * scale);
                int height = Convert.ToInt32(img.Height * scale);
                System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
                bmp.SetResolution(img.HorizontalResolution, img.VerticalResolution);
                
                System.Drawing.Image newImage = bmp.GetThumbnailImage(width, height, null, IntPtr.Zero);
                newImage.Save(Server.MapPath("~/admin/news/thumbs/") + name + "." + extension,System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message + "<br>");
            }
        }

Answer 3

drawing这个类应该可以找到相关方法试试看！