C# 利用NPOI把list导出为excel

安装NPOI.Excel ，NPOI

using System;
using System.Collections.Generic;
using System.DirectoryServices;
using System.IO;
using System.Reflection;
using Newtonsoft.Json;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;

   
 public static void RenderToExcel<T>(List<T> datas)
        {
            MemoryStream ms = new MemoryStream();
            IWorkbook workbook = new HSSFWorkbook();
            ISheet sheet = workbook.CreateSheet("导出数据");
            IRow headerRow = sheet.CreateRow(0);

            int rowIndex = 1, piIndex = 0;
            Type type = typeof(T);
            PropertyInfo[] pis = type.GetProperties();
            int pisLen = pis.Length - 2;//减2是多了2个外键引用
            PropertyInfo pi = null;
            string displayName = string.Empty;
            while (piIndex < pisLen)
            {
                pi = pis[piIndex];
                displayName = pi.Name;
                if (!displayName.Equals(string.Empty))
                {//如果该属性指定了DisplayName，则输出
                    try
                    {
                        headerRow.CreateCell(piIndex).SetCellValue(displayName);
                    }
                    catch (Exception)
                    {
                        headerRow.CreateCell(piIndex).SetCellValue("");
                    }
                }
                piIndex++;
            }
            foreach (T data in datas)
            {
                piIndex = 0;
                IRow dataRow = sheet.CreateRow(rowIndex);
                while (piIndex < pisLen)
                {
                    pi = pis[piIndex];
                    try
                    {
                        dataRow.CreateCell(piIndex).SetCellValue(pi.GetValue(data, null)?.ToString());
                    }
                    catch (Exception)
                    {
                        dataRow.CreateCell(piIndex).SetCellValue("");
                    }
                    piIndex++;
                }
                rowIndex++;
            }
            workbook.Write(ms);
            FileStream dumpFile = new FileStream(@"ur.xls", FileMode.Create, FileAccess.ReadWrite);
            ms.WriteTo(dumpFile);
            ms.Flush();
            ms.Position = 0;
            dumpFile.Close();
        }