static void Main(string[] args)        {            //各物品的概率保存在数组里            float[] area = new float[4]{                0.980f,                0.550f,                0.230f,                0.010f            };            //单次测试            //Console.WriteLine(Get(area));            //批量测试            int[] result = new int[4]{                0,                0,                0,                0            };            for (int i = 0; i < 1770000; i++)    //为了比对结果方便，这里循环的次数是总概率的1000倍            {                int n = Get(area);      //本次抽奖结果                result[n]++;            //统计抽到的次数            }            Console.WriteLine("结果：");            foreach (int times in result)            {                Console.WriteLine(times);            }        }        /// <summary>        /// 获取抽奖结果        /// </summary>        /// <param name="area">各物品的抽中概率</param>        /// <returns>返回抽中的物品所在数组的位置</returns>        private static int Get(float[] prob)        {            int result = 0;            int n = (int)(prob.Sum() * 1000);           //计算概率总和，放大1000倍            Random r = rnd;            float x = (float)r.Next(0, n) / 1000;       //随机生成0~概率总和的数字            for (int i = 0; i < prob.Count(); i++)            {                float pre = prob.Take(i).Sum();         //区间下界                float next = prob.Take(i + 1).Sum();    //区间上界                if (x >= pre && x < next)               //如果在该区间范围内，就返回结果退出循环                {                    result = i;                    break;                }            }            return result;        }        private static Random rnd = new Random();