C#產生隨機數或隨機字母

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public class Rand    {        /// <summary>        /// 產生隨機數字        /// </summary>        /// <param name="length">產生長度</param>        /// <returns></returns>        public static string Number(int Length)        {            return Number(Length, false);        }        /// <summary>        /// 產生隨機數字        /// </summary>        /// <param name="Length">產生長度</param>        /// <param name="Sleep">是否要在產生前將當前線程阻止以避免重複</param>        /// <returns></returns>        public static string Number(int Length,bool Sleep)        {            if(Sleep)                System.Threading.Thread.Sleep(3);            string result = "";            System.Random random = new Random();            for (int i = 0; i < Length; i++)            {                result += random.Next(10).ToString();            }            return result;        }        /// <summary>        /// 產生隨機字母與數字        /// </summary>        /// <param name="IntStr">產生長度</param>        /// <returns></returns>        public static string Str(int Length)        {            return Str(Length, false);        }        /// <summary>        /// 產生隨機字母與數字        /// </summary>        /// <param name="Length">產生長度</param>        /// <param name="Sleep">是否要在產生前將當前線程阻止以避免重複</param>        /// <returns></returns>        public static string Str(int Length, bool Sleep)        {            if(Sleep)                System.Threading.Thread.Sleep(3);            char[] Pattern = new char[] { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘ };            string result = "";            int n = Pattern.Length;            System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));            for (int i = 0; i < Length; i++)            {                int rnd = random.Next(0,n);                result += Pattern[rnd];            }            return result;        }        /// <summary>        /// 產生隨機純字母隨機數        /// </summary>        /// <param name="IntStr">產生長度</param>        /// <returns></returns>        public static string Str_char(int Length)        {            return Str_char(Length, false);        }        /// <summary>        /// 產生隨機純字母隨機數        /// </summary>        /// <param name="Length">產生長度</param>        /// <param name="Sleep">是否要在產生前將當前線程阻止以避免重複</param>        /// <returns></returns>        public static string Str_char(int Length, bool Sleep)        {            if (Sleep) System.Threading.Thread.Sleep(3);            char[] Pattern = new char[] { ‘A‘, ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘, ‘G‘, ‘H‘, ‘I‘, ‘J‘, ‘K‘, ‘L‘, ‘M‘, ‘N‘, ‘O‘, ‘P‘, ‘Q‘, ‘R‘, ‘S‘, ‘T‘, ‘U‘, ‘V‘, ‘W‘, ‘X‘, ‘Y‘, ‘Z‘ };            string result = "";            int n = Pattern.Length;            System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));            for (int i = 0; i < Length; i++)            {                int rnd = random.Next(0, n);                result += Pattern[rnd];            }            return result;        }    }

 

C#產生隨機數或隨機字母