C#读写excle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：https://github.com/tonyqus/npoi

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

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();
    }

读写代码如下：

复制代码

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：

复制代码
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