分页之 skip（pageindex*(index-1).take(size).Tolist();

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public static IList<T> PaginationDataSource<T>(IList<T> list, int pageIndex, int pageSize, out int totals)

        {

            totals = 0;

            if (pageIndex < 0)

                throw new ArgumentException("pageIndex必须大于0");

            if (pageSize <= 0)

                throw new ArgumentException("pageSize必须大于0");

            totals = list.Count;

            int rowBegin = (pageIndex - 1) * pageSize >= totals ? 0 : (pageIndex - 1) * pageSize;

            int rowEnd = rowBegin + pageSize - 1 >= totals ? totals : rowBegin + pageSize - 1;

            IList<T> result = new List<T>();

            for (int i = rowBegin; i < rowEnd; i++)

            {

                result.Add(list[i]);

            }

            return result;

        }