Asp.NET 生成随机码基类(随机字母,随机数字,随机字母+数字 )

using System;


using System.Data;


using System.Configuration;


using System.Web;


using System.Web.Security;


using System.Web.UI;


using System.Web.UI.WebControls;


using System.Web.UI.WebControls.WebParts;


using System.Web.UI.HtmlControls;


using System.Text;






namespace EC




...{




    /**//// <summary>


    /// 随机函数


    /// </summary>


    public class RandomObject




    ...{






        数字随机数#region 数字随机数




        /**//// <summary>


        /// 数字随机数


        /// </summary>


        /// <param name="n">生成长度</param>


        /// <returns></returns>


        public static string RandNum(int n)




        ...{




            char[] arrChar = new char[] ...{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };


            StringBuilder num = new StringBuilder();




            Random rnd = new Random(DateTime.Now.Millisecond);




            for (int i = 0; i < n; i++)




            ...{


                num.Append(arrChar[rnd.Next(0, 9)].ToString());




            }




            return num.ToString();


        }


        #endregion






        数字和字母随机数#region 数字和字母随机数




        /**//// <summary>


        /// 数字和字母随机数


        /// </summary>


        /// <param name="n">生成长度</param>


        /// <returns></returns>


        public static string RandCode(int n)




        ...{




            char[] arrChar = new char[]...{


           'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x',


           '0','1','2','3','4','5','6','7','8','9',


           'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'


          };




            StringBuilder num = new StringBuilder();




            Random rnd = new Random(DateTime.Now.Millisecond);


            for (int i = 0; i < n; i++)




            ...{


                num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());




            }




            return num.ToString();


        }


        #endregion






        字母随机数#region 字母随机数




        /**//// <summary>


        /// 字母随机数


        /// </summary>


        /// <param name="n">生成长度</param>


        /// <returns></returns>


        public static string RandLetter(int n)




        ...{




            char[] arrChar = new char[]...{


            'a','b','d','c','e','f','g','h','i','j','k','l','m','n','p','r','q','s','t','u','v','w','z','y','x',


            '_',


           'A','B','C','D','E','F','G','H','I','J','K','L','M','N','Q','P','R','T','S','V','U','W','X','Y','Z'


          };




            StringBuilder num = new StringBuilder();




            Random rnd = new Random(DateTime.Now.Millisecond);


            for (int i = 0; i < n; i++)




            ...{


                num.Append(arrChar[rnd.Next(0, arrChar.Length)].ToString());




            }




            return num.ToString();


        }


        #endregion






        日期随机函数#region 日期随机函数




        /**//// <summary>


        /// 日期随机函数


        /// </summary>


        /// <param name="ra">长度</param>


        /// <returns></returns>


        public static string DateRndName(Random ra)




        ...{


            DateTime d = DateTime.Now;


            string s = null, y, m, dd, h, mm, ss;


            y = d.Year.ToString();


            m = d.Month.ToString();


            if (m.Length < 2) m = "0" + m;


            dd = d.Day.ToString();


            if (dd.Length < 2) dd = "0" + dd;


            h = d.Hour.ToString();


            if (h.Length < 2) h = "0" + h;


            mm = d.Minute.ToString();


            if (mm.Length < 2) mm = "0" + mm;


            ss = d.Second.ToString();


            if (ss.Length < 2) ss = "0" + ss;


            s += y + m + dd + h + mm + ss;


            s += ra.Next(100, 999).ToString();


            return s;


        }


        #endregion






        生成GUID#region 生成GUID




        /**//// <summary>


        /// 生成GUID


        /// </summary>


        /// <returns></returns>


        public static string GetGuid()




        ...{


            System.Guid g = System.Guid.NewGuid();


            return g.ToString();


        }


        #endregion


    }


}