自由手記

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 public class compositeImage
    {
        public void addimageadd(string[] images)
        {
            string str0 = images[1];
            Image img0 = ReturnImage(str0);
            System.Drawing.Image newImage = img0.GetThumbnailImage(img0.Width, img0.Height, null, new IntPtr());
            Graphics g = Graphics.FromImage(newImage);
            g.DrawImage(img0, 0, 0, img0.Width, img0.Height);
            for (int i = 2; i < images.Length; i++)
            {
                string str1 = images[i];
                Image img1 = ReturnImage(str1);
                g.DrawImage(img1, 0, 0, img1.Width, img1.Height);
            }
            newImage.Save(images[0], ImageFormat.Bmp);
        }
        private static Image ReturnImage(string strPhotoPath)
        {
            FileStream fstream = new FileStream(strPhotoPath, FileMode.OpenOrCreate, FileAccess.Read);
            byte[] byData = new byte[fstream.Length];
            fstream.Read(byData, 0, System.Convert.ToInt32(fstream.Length));
            fstream.Close();
            System.IO.MemoryStream stream = new System.IO.MemoryStream(byData, true);
            stream.Write(byData, 0, byData.Length);
            Bitmap bmp = new Bitmap(stream);
            System.Drawing.Image image = bmp;
            return bmp;
        }
    }

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 string[] data = { "C://haha007.bmp", "C://ad201401240003.png", "C://aa90.png", "C://aa360.png" };
            compositeImage pcg = new compositeImage();
            pcg.addimageadd(data);