图片添加时间或者别的标识

    private void button1_Click(object sender, EventArgs e)
        {


            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = "请选择图片文件";
            ofd.InitialDirectory = @"C:\Users\Administrator\Desktop";
            ofd.Filter = "图片文件或视频文件|*.jpg;*.png;*.bmp;*.gif";
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                //@! 文件图片地址
                this.textBox1.Text = ofd.FileName;

                Image Images = OpenImageFile(ofd.FileName);
                Bitmap bitImg = (Bitmap)Images;
                //@! 此处的做法是避免（GDI）
                Bitmap bmp2 = new Bitmap(bitImg.Width, bitImg.Height);
                Graphics draw = Graphics.FromImage(bmp2);
                draw.DrawImage(bitImg, 0, 0);
                draw.Dispose();
        
                 //@! 1 得到图片Byte[]
                byte[] imageBytes = Convert.FromBase64String(Bitmap2Base64_Jpeg(bmp2));
                //@! 2 得到时间（标识）Byte[]
                string dateTime = System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
                //@! 将字符串转换为Byte[]
                byte[] byteArrayDateTime = System.Text.Encoding.Default.GetBytes(dateTime);

                //@! 3 合并图片跟时间（标识）Byte[]
                byte[] ByteImgData = CopyToBig(imageBytes, byteArrayDateTime);

                //@! =========分割线=============
                //@! 获取时间（标识）信息
                //  byte[]dateByte=new byte[19];
                //  Array.Copy(ByteImgData, ByteImgData.Length - 19, dateByte, 0, 19);
                byte[] dateByte = ByteImgData.Skip(ByteImgData.Length - 19).Take(19).ToArray();

                //@! 将Byte[] 转换为 字符串     （显示）
　　　　　　　　　　　　MessageBox.Show(System.Text.Encoding.Default.GetString(dateByte));

                Image img = ByteToImage(ByteImgData);
                pictureBox1.Image = img;
    
          }
   }





        private byte[] CopyToBig(byte[] bBig, byte[] bSmall)
        {
            List<byte> lTemp = new List<byte>();
            lTemp.AddRange(bBig);
            lTemp.AddRange(bSmall);
            bBig = new byte[lTemp.Count];
            lTemp.CopyTo(bBig);
            return bBig;
        }

        public System.Drawing.Image ByteToImage(byte[] buffer)
        {
            System.Drawing.Image img = null;
            MemoryStream ms = null;

            try
            {
                if (null == buffer || buffer.Length <= 0) throw new Exception("buffer不合法!");

                ms = new MemoryStream(buffer);
                img = System.Drawing.Image.FromStream(ms);
            }
            catch (Exception ex)
            {
                img = null;
                string strErrMsg = ex.Message;
            }
            finally
            {
                if (null != ms)
                {
                    ms.Close();
                    ms.Dispose();
                }
            }

            return img;
        }

   public System.Drawing.Image OpenImageFile(string ImageFilePath)
        {
            System.Drawing.Image img = null;
            FileStream fileStream = null;

            try
            {
                if (string.IsNullOrEmpty(ImageFilePath)) throw new Exception("ImageFilePath不合法!");

                fileStream = new FileStream(ImageFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                fileStream.Lock(0, fileStream.Length);
                img = System.Drawing.Image.FromStream(fileStream);
                fileStream.Unlock(0, fileStream.Length);

            }
            catch (Exception ex)
            {
                img = null;
                string strErrMsg = ex.Message;
            }
            finally
            {
                if (null != fileStream)
                {
                    fileStream.Close();
                    fileStream.Dispose();
                }
            }

            return img;
        }

        public string Bitmap2Base64_Jpeg(Bitmap bitmap)
        {
            string Base64string = null;
            try
            {
                byte[] bytes = Bitmap2Bytes(bitmap, System.Drawing.Imaging.ImageFormat.Jpeg);
                Base64string = Convert.ToBase64String(bytes);
            }
            catch (Exception ex)
            {
                Base64string = null;
                string strErrMsg = ex.Message;
            }

            return Base64string;
        }
        public byte[] Bitmap2Bytes(Bitmap bitmap, ImageFormat format)
        {
            byte[] data = null;

            try
            {
                using (MemoryStream stream = new MemoryStream())
                {
                    bitmap.Save(stream, format);
                    data = new byte[stream.Length];
                    stream.Seek(0, SeekOrigin.Begin);
                    stream.Read(data, 0, Convert.ToInt32(stream.Length));
                }
            }
            catch (Exception ex)
            {
                data = null;
                string strErrMsg = ex.Message;
            }

            return data;
        }                    

 

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　　这几天看到一篇文章，说的是一个盗用某个网红微信照片去骗取别人的钱，之后某网红后面说道以后发表图片要加水印，我在想不加水印也知道这图片是有标识的。或许别人已经做到了，我就根据个人理解的写一段C#WinForm代码，各位大神指点一下，有更好的可以推荐一下。

 

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最后抱怨一下，博客网的后台编辑没有CSDN的后台编辑好，