using System;
using System.Collections.Generic;
using System.Data;
using System.Text;

namespace Estsh.Core.Util
{
    public static class DataTableHelper
    {
        public static DataTable GetTablePage(ref Pager pager, DataTable dt)
        {
            DataTable result = dt.Clone();
            
            if (dt != null && dt.Rows.Count > 0 && pager.pageNo >= 0)
            {
                int startIndex = (pager.pageNo - 1) * pager.pageSize;
                int endIndex = startIndex + pager.pageSize;
                for (; startIndex < endIndex && startIndex < dt.Rows.Count; startIndex++)
                {
                    DataRow resDr = result.NewRow();
                    DataRow dr = dt.Rows[startIndex];
                    for (int idx = 0; idx < dt.Columns.Count; idx++)
                    {
                        resDr[idx] = dr[idx];
                    }

                    result.Rows.Add(resDr);
                }
            }
            pager.totalRows = dt.Rows.Count;
            return result;
        }
    }
}