[C#]NetxtString

关键代码：

        /// <summary>        /// 生成随机字符串        /// </summary>        /// <param name="random">Random</param>        /// <param name="size">字符串长度</param>        /// <param name="lowerCase">字符串是小写</param>        /// <returns>随机字符串</returns>        public static string NetxtString(this Random random, int size, bool lowerCase)        {            StringBuilder _builder = new StringBuilder(size);            int _startChar = lowerCase ? 97 : 65;//65 = A / 97 = a            for (int i = 0; i < size; i++)                _builder.Append((char)(26 * random.NextDouble() + _startChar));            return _builder.ToString();        }

测试代码：

        static void Main(string[] args)        {            try            {                Random _random = new Random();                for (int i = 0; i < 10; i++)                {                    Console.WriteLine(_random.NetxtString(4, false));                }            }            catch (Exception ex)            {                Console.WriteLine(ex.Message);            }            finally            {                Console.ReadLine();            }        }

测试结果：

二，关键代码：

        /// <summary>        /// 0~9 A~Z字符串        /// </summary>        public static string RandomString_09AZ = "0123456789ABCDEFGHIJKMLNOPQRSTUVWXYZ";        /// <summary>        /// 依据指定字符串来生成随机字符串        /// </summary>        /// <param name="random">Random</param>        /// <param name="randomString">指定字符串</param>        /// <param name="size">字符串长度</param>        /// <param name="lowerCase">字符串是小写</param>        /// <returns>随机字符串</returns>        public static string NetxtString(this Random random, string randomString, int size, bool lowerCase)        {            string _nextString = string.Empty;            if (random != null && !string.IsNullOrEmpty(randomString))            {                StringBuilder _builder = new StringBuilder(size);                int _maxCount = randomString.Length - 1;                for (int i = 0; i < size; i++)                {                    int _number = random.Next(0, _maxCount);                    _builder.Append(randomString[_number]);                }                _nextString = _builder.ToString();            }            return lowerCase ? _nextString.ToLower() : _nextString.ToUpper();        }

测试代码：

        static void Main(string[] args)        {            try            {                Random _random = new Random();                string _ramdomString = RandomToolV2.RandomString_09AZ;                for (int i = 0; i < 20; i++)                {                    // Console.WriteLine(_random.NetxtString(4, false));                    Console.WriteLine(_random.NetxtString(_ramdomString, 4, false));                }            }            catch (Exception ex)            {                Console.WriteLine(ex.Message);            }            finally            {                Console.ReadLine();            }        }

代码效果：

希望有所帮助！