C#代码实现：文字转图片工具

/// <summary>
        /// 将文字转换成图片
        /// </summary>
        /// <param name="checkCode"></param>
        /// <returns></returns>
        private System.Drawing.Bitmap CreateCheckCodeImage(string checkCode)
        {
            if (checkCode == null || checkCode.Trim() == String.Empty)
            {
                return null;
            }


            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 27.0)), 25);
            Graphics g = Graphics.FromImage(image);


            try
            {
               //清空图片背景色 
                g.Clear(Color.White);


                //Font font = new System.Drawing.Font("Arial", 16, (System.Drawing.FontStyle.Bold 　 System.Drawing.FontStyle.Italic)); 
                System.Drawing.Font font = new System.Drawing.Font("楷体_GB2312", 16, (System.Drawing.FontStyle.Bold));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new System.Drawing.Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(checkCode, font, brush, 2, 2);


                //画图片的波形滤镜效果