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
        }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40

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 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();
        }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20

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);
        }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14

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);
        }

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15

5. EPPLUS 地址：https://github.com/pruiz/EPPlus/tree/master/EPPlus 没用过这个，就不做介绍了