C＃ 分页计算 总页数、当前页数据集合

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test4
{
    class Program
    {
        static void Main(string[] args)
        {
            int AllCount = 9;
            Console.WriteLine("总个数：" + AllCount);

            int page = AllCount / PageCount;
            int remainder = AllCount % PageCount;
            Console.WriteLine("页数:" + page);
            Console.WriteLine("余数:" + remainder);

            int totalPage = remainder > 0 ? page + 1 : page;
            Console.WriteLine("总页数:" + totalPage);

            //获取第二页索引的起点和结束点
            int index = 2;
            Console.WriteLine(string.Format("获取第{0}页数据",index));
            int start = (index * PageCount) - PageCount;
            int end = (index * PageCount) - 1;
            Console.WriteLine(string.Format("起点：{0}，结束点：{1}，index：{2}", start, end, index));
            Console.WriteLine("========================================");


            //添加随机数
            Random random = new Random();
            for (int i = 0; i < 17; i++)
            {
                MyList.Add(random.Next(10, 1000).ToString());
            }
            Print(MyList);

            //获取当页数据集合
            Console.WriteLine("获取第3页数据");
            List<string> myList = GetIndexList(3);
            Print(myList);

            Console.ReadKey();
        }

        public static List<string> MyList = new List<string>();
        //一页的个数
        public static int PageCount = 8;

        /// <summary>
        /// 获取当页的数据集合
        /// </summary>
        /// <param name="index"></param>
        /// <returns></returns>
        public static List<string> GetIndexList(int index)
        {
            if (MyList.Count <= 0) return null;
            
            int page = MyList.Count / PageCount;
            int remainder = MyList.Count % PageCount;
            int allPage = remainder > 0 ? page + 1 : page;

            if (index > allPage) return null;

            int start = (index * PageCount) - PageCount;
            int end = (index * PageCount) - 1;
            if (end > MyList.Count) end = MyList.Count -1;

            List<string> list = new List<string>();
            for (int i = start; i <= end; i++)
            {
                list.Add(MyList[i]);
            }

            if(list.Count > 0)
                return list;
            return null;
        }

        public static void Print(List<string> list)
        {
            if (list == null || list.Count <= 0) return;

            string msg = string.Empty;
            for (int i = 0; i < list.Count; i++)
            {
                msg += list[i] + ",";
            }

            Console.WriteLine(msg);
        }
    }
}

输出结果：

总个数：9
页数:1
余数:1
总页数:2
获取第2页数据
起点：8，结束点：15，index：2
====
393,318,19,71,597,684,59,892,134,773,657,32,264,231,296,257,733,
获取第3页数据
733,
 

注意===线下面的数据是随机数，每次运行结果不一样，

获取的是第3页，而当前总个数是17，一页是8个，第3页刚好是最后一个，可以看到，计算没有问题

end