code/Data/Imaging.cs

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using System;
using System.Collections.Generic;
using System.Text;

namespace Sylloge.Data
{
    public static class Imaging
    {
        public static System.Drawing.Image FromFile(string file)
        {
            if (System.IO.File.Exists(file)) { return System.Drawing.Image.FromFile(file); }
            return null;
        }

        public static System.Drawing.Image FromStream(System.IO.Stream stream)
        {
            if (stream != null && stream.Length > 0) {
                return System.Drawing.Image.FromStream(stream);
            }
            return null;
        }

        public static string GetMimeType(System.Drawing.Image img)
        {
            foreach (System.Drawing.Imaging.ImageCodecInfo c in System.Drawing.Imaging.ImageCodecInfo.GetImageDecoders()) {
                if (c.FormatID == img.RawFormat.Guid) { return c.MimeType; }
            }
            return "image/unknown";
        }

        public static byte[] ToByteArray(System.Drawing.Image img, string mimeType)
        {
            System.Drawing.Imaging.ImageFormat fmt = new System.Drawing.Imaging.ImageFormat(Guid.Empty);
            mimeType = mimeType.ToLower();
            if (mimeType.Contains("jpg") || mimeType.Contains("jpeg")) {
                fmt = System.Drawing.Imaging.ImageFormat.Jpeg;
            } else if (mimeType.Contains("bitmap") || mimeType.Contains("bmp")) {
                fmt = System.Drawing.Imaging.ImageFormat.Bmp;
            } else if (mimeType.Contains("icon") || mimeType.Contains("ico")) {
                fmt = System.Drawing.Imaging.ImageFormat.Icon;
            } else if (mimeType.Contains("png")) {
                fmt = System.Drawing.Imaging.ImageFormat.Png;
            } else if (mimeType.Contains("gif")) {
                fmt = System.Drawing.Imaging.ImageFormat.Gif;
            } else if (mimeType.Contains("tiff")) {
                fmt = System.Drawing.Imaging.ImageFormat.Tiff;
            } else {
                fmt = System.Drawing.Imaging.ImageFormat.Jpeg;
            }
            System.IO.MemoryStream istream = new System.IO.MemoryStream();
            img.Save(istream, fmt);
            istream.Seek(0, System.IO.SeekOrigin.Begin);
            return istream.ToArray();
        }

        public static byte[] ToByteArray(System.Drawing.Image img, System.Drawing.Imaging.ImageFormat format)
        {
            if (img == null) { return new byte[] { }; }
            System.IO.MemoryStream istream = new System.IO.MemoryStream();
            img.Save(istream, format);
            istream.Seek(0, System.IO.SeekOrigin.Begin);
            return istream.ToArray();
        }
    }
}