DataTable分页

Posted 2022-11-13 棉晗榜

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

namespace WebInfoFormReport.Model

    /// <summary>
    /// DataTable分页
    /// </summary>
    /// 创建时间：2022-6-2 16:19:17。 
    public static class DataTablePageHelpter
    
        /// <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>
        public static DataTable GetOnePageTable(DataTable dtAll, int pageNo, int pageSize)
        
            int totalCount = dtAll.Rows.Count;
            int totalPage = GetTotalPage(totalCount, pageSize);
            int 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 页数据到新表
            int rowBegin = (currentPage - 1) * pageSize;
            int 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];
                newRow.ItemArray = oldRow.ItemArray;
                //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 static int GetTotalPage(int totalCount, int pageSize)
        
            //var totalPage = (totalCount / pageSize) + (totalCount % pageSize > 0 ? 1 : 0);
            int totalPage = (int)Math.Ceiling((decimal)totalCount / pageSize);
            return totalPage;