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﻿/*************************************************************************************************
  Required Notice: Copyright (C) EPPlus Software AB. 
  This software is licensed under PolyForm Noncommercial License 1.0.0 
  and may only be used for noncommercial purposes 
  https://polyformproject.org/licenses/noncommercial/1.0.0/
  A commercial license to use this software can be purchased at https://epplussoftware.com
 *************************************************************************************************
  Date               Author                       Change
 *************************************************************************************************
  05/07/2021         EPPlus Software AB       EPPlus 5.7
 *************************************************************************************************/
using OfficeOpenXml.Table;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace OfficeOpenXml.Sorting
    /// <summary>
    /// Sort options for sorting an <see cref="ExcelTable"/>
    /// </summary>
    public class TableSortOptions : SortOptionsBase 
        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="table">The table sort</param>
        public TableSortOptions(ExcelTable table) : base()
            _table = table;
            _columnNameIndexes = new Dictionary<string, int>(StringComparer.CurrentCultureIgnoreCase);
            for(var x = 0; x < table.Columns.Count(); x++)
                _columnNameIndexes[table.Columns.ElementAt(x).Name] = x;
        private TableSortLayer _sortLayer = null;
        private readonly ExcelTable _table;
        private readonly Dictionary<string, int> _columnNameIndexes;
        internal ExcelTable Table
            get { return _table; }
        internal int GetColumnNameIndex(string name)
            if(!_columnNameIndexes.ContainsKey(name))
                throw new InvalidOperationException($"Table {_table.Name} does not contain column {name}");
            return _columnNameIndexes[name];
        /// <summary>
        /// Defines the first <see cref="TableSortLayer"/>.
        /// </summary>
        public TableSortLayer SortBy
                if (_sortLayer == null)
                    _sortLayer = new TableSortLayer(this);
                return _sortLayer;

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TableSortOptions.cs

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