using Microsoft.Office.Interop.Excel;
using Excel = Microsoft.Office.Interop.Excel;

    private void btn_Office_Click(object sender, EventArgs e)
    {
      string importExcelPath = "E:\\import.xlsx";
      string exportExcelPath = "E:\\export.xlsx";
      //創(chuàng)建
      Excel.Application xlApp = new Excel.Application();
      xlApp.DisplayAlerts = false;
      xlApp.Visible = false;
      xlApp.ScreenUpdating = false;
      //打開Excel
      Excel.Workbook xlsWorkBook = xlApp.Workbooks.Open(importExcelPath, System.Type.Missing, System.Type.Missing, System.Type.Missing,
      System.Type.Missing, System.Type.Missing, System.Type.Missing, System.Type.Missing, System.Type.Missing, System.Type.Missing, System.Type.Missing,
      System.Type.Missing, System.Type.Missing, System.Type.Missing, System.Type.Missing);

      //處理數(shù)據(jù)過程，更多操作方法自行百度
      Excel.Worksheet sheet = xlsWorkBook.Worksheets[1];//工作薄從1開始，不是0
      sheet.Cells[1, 1] = "test";

      //另存
      xlsWorkBook.SaveAs(exportExcelPath, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlNoChange,
        Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
      //關(guān)閉Excel進(jìn)程
      ClosePro(xlApp, xlsWorkBook);
    }

    public void ClosePro(Excel.Application xlApp, Excel.Workbook xlsWorkBook)
    {
      if (xlsWorkBook != null)
        xlsWorkBook.Close(true, Type.Missing, Type.Missing);
      xlApp.Quit();
      // 安全回收進(jìn)程
      System.GC.GetGeneration(xlApp);
      IntPtr t = new IntPtr(xlApp.Hwnd);  //獲取句柄
      int k = 0;
      GetWindowThreadProcessId(t, out k);  //獲取進(jìn)程唯一標(biāo)志
      System.Diagnostics.Process p = System.Diagnostics.Process.GetProcessById(k);
      p.Kill();   //關(guān)閉進(jìn)程
    }

using System.IO;
using NPOI;
using NPOI.SS.UserModel;

    private void btn_NPOI_Click(object sender, EventArgs e)
    {
      string importExcelPath = "E:\\import.xlsx";
      string exportExcelPath = "E:\\export.xlsx";
      IWorkbook workbook = WorkbookFactory.Create(importExcelPath);
      ISheet sheet = workbook.GetSheetAt(0);//獲取第一個(gè)工作薄
      IRow row = (IRow)sheet.GetRow(0);//獲取第一行

      //設(shè)置第一行第一列值,更多方法請參考源官方Demo
      row.CreateCell(0).SetCellValue("test");//設(shè)置第一行第一列值

      //導(dǎo)出excel
      FileStream fs = new FileStream(exportExcelPath, FileMode.Create, FileAccess.ReadWrite);
      workbook.Write(fs);
      fs.Close();
    }

using ClosedXML;
using ClosedXML.Excel;

    private void btn_ClosedXML_Click(object sender, EventArgs e)
    {
      string importExcelPath = "E:\\import.xlsx";
      string exportExcelPath = "E:\\export.xlsx";
      var workbook = new XLWorkbook(importExcelPath);

      IXLWorksheet sheet = workbook.Worksheet(1);//這個(gè)庫也是從1開始
      //設(shè)置第一行第一列值,更多方法請參考官方Demo
      sheet.Cell(1, 1).Value = "test";//該方法也是從1開始，非0

      workbook.SaveAs(exportExcelPath);
    }

using Spire.Xls;

    private void btnSpire_Click(object sender, EventArgs e)
    {
      string importExcelPath = "E:\\import.xlsx";
      string exportExcelPath = "E:\\export.xlsx";

      Spire.Xls.Workbook workbook = new Spire.Xls.Workbook();
      workbook.LoadFromFile(importExcelPath);
      //處理Excel數(shù)據(jù)，更多請參考官方Demo
      Spire.Xls.Worksheet sheet = workbook.Worksheets[0];
      sheet.Range[1,1].Text = "test";//該方法也是從1開始，非0

      workbook.SaveToFile(exportExcelPath);
    }