C#-DataTable分页代码

Posted 2020-07-16 SummerRain

        /// <summary>
        /// DataTable分页并取出指定页码的数据
        /// </summary>
        /// <param name="dtAll">DataTable</param>
        /// <param name="pageNo">页码,注意：从1开始</param>
        /// <param name="pageSize">每页条数</param>
        /// <returns>指定页码的DataTable数据</returns>
        private DataTable getOnePageTable(DataTable dtAll, int pageNo, int pageSize)
        {
            var totalCount = dtAll.Rows.Count;
            var totalPage = getTotalPage(totalCount, pageSize);
            var currentPage = pageNo;
            currentPage = (currentPage > totalPage ? totalPage : currentPage);//如果PageNo过大，则较正PageNo=PageCount
            currentPage = (currentPage <= 0 ? 1 : currentPage);//如果PageNo<=0，则改为首页
            //----克隆表结构到新表
            var onePageTable = dtAll.Clone();
            //----取出1页数据到新表
            var rowBegin = (currentPage - 1) * pageSize;
            var rowEnd = currentPage * pageSize;
            rowEnd = (rowEnd > totalCount ? totalCount : rowEnd);
            for (var i = rowBegin; i <= rowEnd - 1; i++)
            {
                var newRow = onePageTable.NewRow();
                var oldRow = dtAll.Rows[i];
                foreach (DataColumn column in dtAll.Columns)
                {
                    newRow[column.ColumnName] = oldRow[column.ColumnName];
                }
                onePageTable.Rows.Add(newRow);
            }
            return onePageTable;
        }

        /// <summary>
        /// 返回分页后的总页数
        /// </summary>
        /// <param name="totalCount">总记录条数</param>
        /// <param name="pageSize">每页显示条数</param>
        /// <returns>总页数</returns>
        public int getTotalPage(int totalCount, int pageSize)
        {
            var totalPage = (totalCount / pageSize) + (totalCount % pageSize > 0 ? 1 : 0);
            return totalPage;
        }