internal NpoiHelper()
{
_entityType = typeof(TEntity);
_excelConfiguration = (ExcelConfiguration <TEntity>)InternalCache.TypeExcelConfigurationDictionary.GetOrAdd(_entityType,
t => InternalHelper.GetExcelConfigurationMapping <TEntity>());
_sheetSettings = _excelConfiguration.SheetSettings.AsReadOnly();
InternalHelper.AdjustColumnIndex(_excelConfiguration);
_propertyColumnDictionary = _excelConfiguration.PropertyConfigurationDictionary.Where(_ => !_.Value.PropertySetting.IsIgnored).ToDictionary(_ => _.Key, _ => _.Value.PropertySetting);
}
