C#生成图片验证码

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  private void CreateImage(string codes)        {            try            {                int iMapWidth = codes.Length * 21;                Bitmap map = new Bitmap(iMapWidth, 28);     //创建图片背景                Graphics graph = Graphics.FromImage(map);                graph.Clear(Color.AliceBlue);//清除画面，填充背景                graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, map.Width - 1, map.Height - 1);//画一个边框                graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//模式 抗锯齿                Random rand = new Random();                //背景噪点生成                Pen blackPen = new Pen(Color.LightGray, 0);                for (int i = 0; i < 50; i++)                {                    int x = rand.Next(0, map.Width);                    int y = rand.Next(0, map.Height);                    graph.DrawRectangle(blackPen, x, y, 1, 1);                }                //验证码旋转，防止机器识别                char[] chars = codes.ToCharArray();//拆散字符串成单字符数组                //文字距中                StringFormat format = new StringFormat(StringFormatFlags.NoClip);                format.Alignment = StringAlignment.Center;                format.LineAlignment = StringAlignment.Center;                //定义颜色                Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };                                //定义字体                string[] font = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };                for (int i = 0; i < chars.Length; i++)                {                    int cindex = rand.Next(7);                    int findex = rand.Next(5);                    Font f = new System.Drawing.Font(font[findex], 13, System.Drawing.FontStyle.Bold);//字体样式(参数2为字体大小)                                        Brush b = new System.Drawing.SolidBrush(c[cindex]);                          graph.DrawString(chars[i].ToString(), f, b, i*16+8, 15, format);                }                this.pictureBox1.Image = map;            }            catch (ArgumentException ex)            {                MessageBox.Show("创建图片验证码错误，错误原因："+ex.Message.ToString());            }        }

        /// <summary>        /// 得到单个字符        /// </summary>        /// <param name="a"></param>        /// <param name="b"></param>        /// <returns></returns>        private string getOneCode(int a, int b)        {            char c = (char)ran.Next(a, b);            return c.ToString();        }        /// <summary>        /// 得到验证码        /// </summary>        /// <returns></returns>        private string getCode()        {            string code = "";            //Ascii码范围：数字:48-57，小写字母:97-122，大写字母:65-90              code += getOneCode(48,57);            code += getOneCode(97, 122);            code += getOneCode(65, 90);            code += getOneCode(97, 122);            code += getOneCode(48, 57);            return code;        }        /// <summary>        /// 加载验证码        /// </summary>        private void LoadCode()        {            string right_code = getCode();            CreateImage(right_code);        }

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