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/// <summary>

    /// 将图片数据转换为Base64字符串

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    private void ToBase64(object sender, EventArgs e)

    {

      Image img = this.pictureBox.Image;

      BinaryFormatter binFormatter = new BinaryFormatter();

      MemoryStream memStream = new MemoryStream();

      binFormatter.Serialize(memStream, img);

      byte[] bytes = memStream.GetBuffer();

      string base64 = Convert.ToBase64String(bytes);

      this.richTextBox.Text = base64;

    }

    /// <summary>

    /// 将Base64字符串转换为图片

    /// </summary>

    /// <param name="sender"></param>

    /// <param name="e"></param>

    private void ToImage(object sender, EventArgs e)

    {

      string base64 = this.richTextBox.Text;

      byte[] bytes = Convert.FromBase64String(base64);

      MemoryStream memStream = new MemoryStream(bytes);

      BinaryFormatter binFormatter = new BinaryFormatter();

      Image img = (Image)binFormatter.Deserialize(memStream);

      this.pictureBox.Image = img;

    }

/// <summary>
        /// 显示头像
        /// </summary>
        /// <param name="imageBytes">图片二进制流</param>
        public void PictureShow(byte[] imageBytes)
        {
            if (imageBytes != null)
            {
                //读取二进制转换成图片
                MemoryStream ms = new MemoryStream(imageBytes);
                Bitmap bmpt = new Bitmap(ms);
                pictureDocImg.Image = bmpt;
                pictureDocImg.SizeMode = PictureBoxSizeMode.Zoom;
            }
            else
            {
                pictureDocImg.Image = null;
            }

}

/// <summary>
        /// 将Base64字符串转换为图片
        /// </summary>
        /// <param name="pictureBox">图片控件</param>
        /// <param name="base64String">base64位图片字符串</param>
        public static void ToImage(PictureBox pictureBox, string base64String)
        {
            string base64 = base64String;//"data:image/jpg;base64,"
            byte[] bytes = Convert.FromBase64String(base64);
            MemoryStream memStream = new MemoryStream(bytes, 0, bytes.Length);
            memStream.Position = 0;
            Bitmap bmp = new Bitmap(memStream);
            pictureBox.Image = bmp;
        }