随机 取题

                /// <summary>        /// 得到随机抽取重组DataTable        /// </summary>        /// <param name="dt">DataTable</param>        /// <param name="randomNum">抽取数量，0返回原数据</param>        /// <returns></returns>        public static DataTable GetRandomDataTable(DataTable dt, int randomNum)        {            if(randomNum == 0)            {                return dt;            }            int[] array = RandomArray(0, dt.Rows.Count-1);            DataTable newDt = dt.Copy();            newDt.Rows.Clear();            for (int k = 0; k < randomNum; k++)            {                newDt.ImportRow(dt.Rows[array[k]]);            }            return newDt;        }        /// <summary>        /// 得到非重复的随机数组        /// </summary>        /// <param name="small">小数</param>        /// <param name="large">大数</param>        /// <returns></returns>        private static int[] RandomArray(int small, int large)        {            int x = 0, tmp = 0;            if (small > large)            {                tmp = small;                small = large;                large = tmp;            }            int[] array = new int[large - small + 1];            for (int i = small; i <= large; i++)            {                array[i - small] = i;            }            Random random = new Random(unchecked((int)DateTime.Now.Ticks));            for (int i = array.Length - 1; i > 0; i--)            {                x = random.Next(0, i + 1);                tmp = array[i];                array[i] = array[x];                array[x] = tmp;            }            return array;        }

随机菜单算个小玩具