C# NPOI Excel

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;
using NPOI.XSSF.UserModel;
using NPOI.SS.UserModel;
using System.IO;
using System.Diagnostics;

namespace ConsoleApp326
{
class Program
{
static string excelFullName = Directory.GetCurrentDirectory() + "\" + DateTime.Now.ToString("yyyyMMddHHmmssffff") + ".xlsx";
static string logFullName = Directory.GetCurrentDirectory() + "\" + DateTime.Now.ToString("yyyyMMdd") + "log.txt";
static int exportNum = 0;
static string exportMsg = "";
static Stopwatch stopWatch = new Stopwatch();
static void Main(string[] args)
{
ExportOrderList();
}

static void ExportOrderList()
{
List<SalesOrderDetail> orderList = GetOrdersDetailList();
ExportTData<SalesOrderDetail>(orderList);
}
static List<SalesOrderDetail> GetOrdersDetailList()
{
List<SalesOrderDetail> orderList = new List<SalesOrderDetail>();
using (AdventureWorks2017Entities db = new AdventureWorks2017Entities())
{
orderList = db.SalesOrderDetails.ToList();
orderList.AddRange(orderList);
orderList.AddRange(orderList);
orderList.AddRange(orderList);
if(orderList!=null && orderList.Any())
{
return orderList;
}
}
return null;
}
static void ExportTData<T>(List<T> dataList)
{
stopWatch.Start();
if(dataList==null || !dataList.Any())
{
return;
}

XSSFWorkbook book;
ISheet firstSheet;
try
{
book = new XSSFWorkbook();
var firstRowData = dataList.FirstOrDefault();
var props = firstRowData.GetType().GetProperties().ToList();
firstSheet = book.CreateSheet("First Sheet");
if (props!=null && props.Any())
{
IRow headerRow = firstSheet.CreateRow(0);
for(int i=0;i<props.Count;i++)
{
ICell headerCell = headerRow.CreateCell(i);
if(!string.IsNullOrEmpty(props[i].Name))
{
headerCell.SetCellValue(props[i].Name);
}
}
}

for(int rowIndex=1;rowIndex<=dataList.Count;rowIndex++)
{
IRow dataRow = firstSheet.CreateRow(rowIndex);
for(int j=0;j<props.Count;j++)
{
ICell dataCell = dataRow.CreateCell(j);
var dataCellValue = props[j].GetValue(dataList[rowIndex - 1]);
if(dataCellValue!=null)
{
dataCell.SetCellValue(dataCellValue.ToString());
}
}
}

using (FileStream excelStream = File.OpenWrite(excelFullName))
{
book.Write(excelStream);
}

stopWatch.Stop();
exportMsg = $"Export excel name {excelFullName},export num {exportNum}, " +
$"time cost {stopWatch.ElapsedMilliseconds}" +
$" milliseconds, memory {Process.GetCurrentProcess().PrivateMemorySize64}";
LogMessage(exportMsg);
}
catch(Exception ex)
{
LogMessage(ex.TargetSite.ToString());
}
}

static void LogMessage(string msg)
{
using (StreamWriter logStream = new StreamWriter(logFullName, true))
{
logStream.WriteLine(msg + Environment.NewLine);
}
}
}
}