C#生成随机验证码代码分享

            }
            return result;
        }
        #endregion
    }

    /// <summary>
    /// 验证图片类
    /// </summary>
    public class YZMHelper
    {
        #region 私有字段
        private string text;
        private Bitmap image;
        private int letterCount = 4;   //验证码位数
        private int letterWidth = 16;  //单个字体的宽度范围
        private int letterHeight = 20; //单个字体的高度范围
        private static byte[] randb = new byte[4];
        private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
        private Font[] fonts = 
    {
       new Font(new FontFamily("Times New Roman"),10 +Next(1),System.Drawing.FontStyle.Regular),
       new Font(new FontFamily("Georgia"), 10 + Next(1),System.Drawing.FontStyle.Regular),
       new Font(new FontFamily("Arial"), 10 + Next(1),System.Drawing.FontStyle.Regular),
       new Font(new FontFamily("Comic Sans MS"), 10 + Next(1),System.Drawing.FontStyle.Regular)
    };
        #endregion

        #region 公有属性
        /// <summary>
        /// 验证码
        /// </summary>
        public string Text
        {
            get { return this.text; }
        }

        /// <summary>
        /// 验证码图片
        /// </summary>
        public Bitmap Image