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[];//工作薄从1开始，不是0
             sheet.Cells[, ] = "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 = ;
             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

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();//获取第一个工作薄
             IRow row = (IRow)sheet.GetRow();//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().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();//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(, ).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[];
             sheet.Range[,].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