VisualComponents/VisualComponentsLib/Components/SupportClasses/SetDataTable.cs

using DocumentFormat.OpenXml.Wordprocessing;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using VisualComponentsLib.Components.SupportClasses.Enums;

namespace VisualComponentsLib.Components.SupportClasses
{
    public class SetDataTable<T>
    {
        public string FilePath = string.Empty;

        public string FileHeader = string.Empty;

        //высота столбцов
        public List<double> HeightRow = new();

        //высота колонок
        public List<double> WidthCol = new();

        public List<T> DataList;

        public SetDataTable(string filePath, string fileHeader, List<double> heightRow,
            List<double> widthCol, List<T> dataList)
        {
            FilePath = filePath;
            FileHeader = fileHeader;
            HeightRow = heightRow;
            WidthCol = widthCol;
            DataList = dataList;

            DataList = GroupValue(DataList);
        }

        //группировка элементов списка по первому полю
        private static List<T> GroupValue<T>(List<T> data)
        {
            var mainField = data[0].GetType().GetProperties().First().Name;

            return (List<T>)data.GroupBy(field => field.GetType().GetProperties().First().Name).Select(field => field.ToList());
        }
    }
}