C#生成分页页码

        /// <summary>
        /// 生成分页页码
        /// </summary>
        /// <param name="total">总数</param>
        /// <param name="pagesize">页大小</param>
        /// <param name="index">当前页</param>
        /// <param name="length">返回页码个数</param>
        /// <returns></returns>
        public static int[] PageSplit(int total,int pagesize,int index,int length)
        {
            //总页数
            var pagetotal = total / pagesize;
            if (total % pagesize > 0) { pagetotal++; }
            //当前页校正
            if (index < 1) { index = 1; }
            if (index > pagetotal) { index = pagetotal; }

            var listSplit = new List<int>();

            var len = length;
            if (len % 2 == 0) { len++; }
            var half = len / 2;

            var start = index - half;
            var end = index + half;
            
            if (start < 1)
            {
                var p = 1 - start;
                start += p;
                end += p;
            }
            if (end > pagetotal)
            {
                var p = end - pagetotal;
                end = pagetotal;
                if (start - p >= 1) { start -= p; }
                else { start = 1; }
            }
            for (int i = start, j = 0; i <= end && j < length; i++, j++)
            {
                listSplit.Add(i);
            }
            return listSplit.ToArray();
        }

完整代码：

namespace Common
{
    /// <summary>
    /// web端分页
    /// </summary>
    public class PageSplit
    {
        /// <summary>
        /// 初始化
        /// </summary>
        /// <param name="totalRecoord">总记录数</param>
        /// <param name="currentPage">当前页</param>
        /// <param name="pageSize">页大小</param>
        public PageSplit(int totalRecoord,int currentPage,int pageSize)
        {
            TotalRecord = totalRecoord;
            CurrentPage = currentPage;
            PageSize = pageSize;

            TotalPage = GetTotalPage(totalRecoord, pageSize);
            if ((currentPage - 1) < 1) { PrevPage = 1; }
            else { PrevPage = currentPage - 1; }
            if ((currentPage + 1) > TotalPage) { NextPage = TotalPage; }
            else { NextPage = currentPage + 1; }
        }

        #region 初始化属性
        /// <summary> 总记录数 </summary>
        public int TotalRecord { get; private set; }
        /// <summary> 当前页 </summary>
        public int CurrentPage { get; private set; }
        /// <summary> 页大小 </summary>
        public int PageSize { get; private set; }
        /// <summary> 上一页 </summary>
        public int PrevPage { get; private set; }
        /// <summary> 下一页 </summary>
        public int NextPage { get; private set; }
        /// <summary> 总页数 </summary>
        public int TotalPage { get; private set; }
        #endregion

        #region 可设置属性
        private int SplitLength = 5;
        private string _ActiveTemplate = "<a class="active" href="{pageindex}"></a>";
        private string _DefaultTemplate = "<a href="{pageindex}"></a>";

        /// <summary> 设置页码数量 </summary>
        public int SetSplitLength { get { return SplitLength; } set { SplitLength = value; } }
        /// <summary> 活动页模板 </summary>
        public string ActiveTemplate { get { return _ActiveTemplate; } set { _ActiveTemplate = value; } }
        /// <summary> 普通页模板 </summary>
        public string DefaultTemplate { get { return _DefaultTemplate; } set { _DefaultTemplate = value; } }
        #endregion

        /// <summary>
        /// 分页Html代码
        /// </summary>
        public string SplitHtml
        {
            get
            {
                StringBuilder sbHtml = new StringBuilder();
                var pages = Split(TotalRecord, PageSize, CurrentPage, SplitLength);
                foreach (var index in pages)
                {
                    if (index == CurrentPage) { sbHtml.Append(ActiveTemplate.ToLower().Replace("{pageindex}", index.ToString())); }
                    else { sbHtml.Append(DefaultTemplate.ToLower().Replace("{pageindex}", index.ToString())); }
                }
                return sbHtml.ToString();
            }
        }

        #region 方法
        /// <summary>
        /// 获取总页数
        /// </summary>
        /// <param name="totalRecord"></param>
        /// <param name="pageSize"></param>
        /// <returns></returns>
        private static int GetTotalPage(int totalRecord,int pageSize)
        {
            var pagetotal = totalRecord / pageSize;
            if (totalRecord % pageSize > 0) { pagetotal++; }
            return pagetotal;
        }
        /// <summary>
        /// 生成分页页码
        /// </summary>
        /// <param name="total">总数</param>
        /// <param name="pagesize">页大小</param>
        /// <param name="index">当前页</param>
        /// <param name="length">返回页码个数</param>
        /// <returns></returns>
        public static int[] Split(int total, int pagesize, int index, int length)
        {
            //总页数
            var pagetotal = GetTotalPage(total,pagesize);
            //当前页校正
            if (index < 1) { index = 1; }
            if (index > pagetotal) { index = pagetotal; }

            var listSplit = new List<int>();

            var len = length;
            if (len % 2 == 0) { len++; }
            var half = len / 2;

            var start = index - half;
            var end = index + half;

            if (start < 1)
            {
                var p = 1 - start;
                start += p;
                end += p;
            }
            if (end > pagetotal)
            {
                var p = end - pagetotal;
                end = pagetotal;
                if (start - p >= 1) { start -= p; }
                else { start = 1; }
            }
            for (int i = start, j = 0; i <= end && j < length; i++, j++)
            {
                listSplit.Add(i);
            }
            return listSplit.ToArray();
        }
        #endregion
    }
}