详解C#读写Excel的几种方法

1 使用office自带的库

前提是本机须安装office才能运行，且不同的office版本之间可能会有兼容问题，从nuget下载 microsoft.office.interop.excel

读写代码如下：

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";
      //创建
      excel.application xlapp = new excel.application();
      xlapp.displayalerts = false;
      xlapp.visible = false;
      xlapp.screenupdating = false;
      //打开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);

      //处理数据过程，更多操作方法自行百度
      excel.worksheet sheet = xlsworkbook.worksheets[1];//工作薄从1开始，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);
      //关闭excel进程
      closepro(xlapp, xlsworkbook);
    }

    public void closepro(excel.application xlapp, excel.workbook xlsworkbook)
    {
      if (xlsworkbook != null)
        xlsworkbook.close(true, type.missing, type.missing);
      xlapp.quit();
      // 安全回收进程
      system.gc.getgeneration(xlapp);
      intptr t = new intptr(xlapp.hwnd);  //获取句柄
      int k = 0;
      getwindowthreadprocessid(t, out k);  //获取进程唯一标志
      system.diagnostics.process p = system.diagnostics.process.getprocessbyid(k);
      p.kill();   //关闭进程
    }

2. 使用npoi　　

地址：

在不安装office的时候也是可以读写的，速度很快，从nuget下载 npoi

读写代码如下：

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);//获取第一个工作薄
      irow row = (irow)sheet.getrow(0);//获取第一行

      //设置第一行第一列值,更多方法请参考源官方demo
      row.createcell(0).setcellvalue("test");//设置第一行第一列值

      //导出excel
      filestream fs = new filestream(exportexcelpath, filemode.create, fileaccess.readwrite);
      workbook.write(fs);
      fs.close();
    }

3. 使用closedxml　　

地址：https://github.com/closedxml/closedxml

从nuget下载closedxml

读写代码如下：

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);//这个库也是从1开始
      //设置第一行第一列值,更多方法请参考官方demo
      sheet.cell(1, 1).value = "test";//该方法也是从1开始，非0

      workbook.saveas(exportexcelpath);
    }

4. 使用 spire.xls　　

地址：https://www.e-iceblue.com/introduce/free-xls-component.html

spire分免费和收费，无特殊需求用免费即可

从nuget下载free spire.xls for .net

读写代码如下：

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);
      //处理excel数据，更多请参考官方demo
      spire.xls.worksheet sheet = workbook.worksheets[0];
      sheet.range[1,1].text = "test";//该方法也是从1开始，非0

      workbook.savetofile(exportexcelpath);
    }

5. epplus　　

地址：https://github.com/pruiz/epplus/tree/master/epplus

没用过这个，暂时就不做介绍了

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