using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Security.Cryptography;namespace Salt{    public static class RNG    {        private static RNGCryptoServiceProvider rngp = new RNGCryptoServiceProvider();        private static byte[] rb = new byte[4];        /// <summary>        /// 产生一个非负数的随机数        /// </summary>        public static int Next()        {            rngp.GetBytes(rb);            int value = http://www.mamicode.com/BitConverter.ToInt32(rb, 0);            if (value < 0) value = http://www.mamicode.com/-value;            return value;        }        /// <summary>        /// 产生一个非负数且最大值 max 以下的随机数        /// </summary>        /// <param name="max">最大值</param>        public static int Next(int max)        {            rngp.GetBytes(rb);            int value = http://www.mamicode.com/BitConverter.ToInt32(rb, 0);            value = value % (max + 1);            if (value < 0) value = http://www.mamicode.com/-value;            return value;        }        /// <summary>        /// 产生一个非负数且最小值在 min 以上最大值在 max 以下的随机数        /// </summary>        /// <param name="min">最小值</param>        /// <param name="max">最大值</param>        public static int Next(int min, int max)        {            int value = http://www.mamicode.com/Next(max - min) + min;            return value;        }    }}