“преобразовать Excel в DataTable с использованием epplus” Ответ

преобразовать Excel в DataTable с использованием epplus

 readonly DataTable dt = new DataTable();
        /// <summary>
        /// Convert excel file to DataTable by xml configuration
        /// </summary>
        /// <param name="xmllFilePath">xml filepath</param>
        /// <param name="excelFilePath">excel filePath</param>
        /// <returns>DataTable</returns>
        public DataTable Read(string xmllFilePath, string excelFilePath)
        {
            try
            {
                List<string> xmlColumns = MiscUtil.ExtractXMLToList(xmllFilePath);
                List<string> xcelColumnNames = new List<string>();

                FileInfo excelFile = new FileInfo(excelFilePath); ;
                ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
                using (ExcelPackage package = new ExcelPackage(excelFile))
                {
                    //get colmuns and store to list 
                    ExcelWorksheet workSheet = package.Workbook.Worksheets[0];
                    {
                        for (int i = 1; i <= workSheet.Dimension.End.Column; i++)
                        {
                            xcelColumnNames.Add(workSheet.Cells[1, i].Value.ToString());
                        }
                    }
                    //get indexes to compare xml and excel columns
                    Dictionary<string, int> indexes = MiscUtil.GetDictionaryOfListArray(xmlColumns, xcelColumnNames.ToArray());
                    //get the match columns and add to datatable columns
                    foreach (var header in indexes)
                    {
                        if (header.Value >= 0)
                        {
                            dt.Columns.Add(header.Key);
                        }
                    }
                    // add rows
                    foreach (ExcelWorksheet workSheetR in package.Workbook.Worksheets)
                    {
                       // int columnCnt = workSheetR.Dimension.End.Column;
                        int rowCnt = workSheetR.Dimension.End.Row;
                        var dicValue = indexes.Select(x => x.Value).ToList();
                        List<int> lstOfMatchColumn = dicValue.FindAll(x => x >= 0);
                        List<string> columns = new List<string>();

                        for (int row = 2; row <= rowCnt; row++)
                        {
                            foreach (var col in lstOfMatchColumn)
                            {
                                columns.Add(workSheetR.Cells[row, col + 1].Value?.ToString().Trim());
                            }

                            string[] columnsArray = MiscUtil.ConvertListToArray(columns);
                            dt.Rows.Add(columnsArray);
                            //clear so it will be new list of columns
                            columns.Clear();
                        }
                    }
                }
                return dt;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }