.NET Core 中导入导出Excel

操作Excel是一个比较常见的业务场景，本篇将使用EPPlus简单演示一个导入导出的示例。

EPPlus开源地址：https://github.com/EPPlusSoftware/EPPlus

在项目中添加EPPlus组件

Install-Package EPPlus

导入

先准备一个Excel文件，将其内容读取出来，并序列化成JSON字符串进行返回。

[HttpPost]public List<ExcelDemoDto> Import([FromForm] ImportExcelInput input){    var list = new List<ExcelDemoDto>();    using (var package = new ExcelPackage(input.ExcelFile.OpenReadStream()))    {        // 获取到第一个Sheet，也可以通过 Worksheets["name"] 获取指定的工作表        var sheet = package.Workbook.Worksheets.First();        #region 获取开始和结束行列的个数，根据个数可以做各种校验工作        // +1 是因为第一行往往我们获取到的都是Excel的标题        int startRowNumber = sheet.Dimension.Start.Row + 1;        int endRowNumber = sheet.Dimension.End.Row;        int startColumn = sheet.Dimension.Start.Column;        int endColumn = sheet.Dimension.End.Column;        #endregion        // 循环获取整个Excel数据表数据        for (int currentRow = startRowNumber; currentRow <= endRowNumber; currentRow++)        {            list.Add(new ExcelDemoDto            {                AAA = sheet.Cells[currentRow, 1].Text,                BBB = sheet.Cells[currentRow, 2].Text,                CCC = sheet.Cells[currentRow, 3].Text,                DDD = sheet.Cells[currentRow, 4].Text,                EEE = sheet.Cells[currentRow, 5].Text,                FFF = sheet.Cells[currentRow, 6].Text            });        }    }    return list;}public class ExcelDemoDto{    public string AAA { get; set; }    public string BBB { get; set; }    public string CCC { get; set; }    public string DDD { get; set; }    public string EEE { get; set; }    public string FFF { get; set; }}public class ImportExcelInput{    public IFormFile ExcelFile { get; set; }}

导出

[HttpGet]public async Task<string> Export(){    using var package = new ExcelPackage();    var worksheet = package.Workbook.Worksheets.Add("sheet1");    var headers = new string[] { "AAA", "BBB", "CCC", "DDD", "EEE", "FFF" };    for (int i = 0; i < headers.Length; i++)    {        worksheet.Cells[1, i + 1].Value = headers[i];        worksheet.Cells[1, i + 1].Style.Font.Bold = true;    }    // 模拟数据    var list = new List<ExcelDemoDto>();    for (int i = 1; i <= 10; i++)    {        list.Add(new ExcelDemoDto        {            AAA = $"A{i}",            BBB = $"B{i}",            CCC = $"C{i}",            DDD = $"D{i}",            EEE = $"E{i}",            FFF = $"F{i}"        });    }    // 支持各种直接获取数据的方法    // worksheet.Cells.Load*...    int row = 2;    foreach (var item in list)    {        worksheet.Cells[row, 1].Value = item.AAA;        worksheet.Cells[row, 2].Value = item.BBB;        worksheet.Cells[row, 3].Value = item.CCC;        worksheet.Cells[row, 4].Value = item.DDD;        worksheet.Cells[row, 5].Value = item.EEE;        worksheet.Cells[row, 6].Value = item.FFF;        row++;    }    // 通常做法是，将excel上传至对象存储，获取到下载链接，这里将其输出到项目根目录。    var path = Path.Combine(Directory.GetCurrentDirectory(), $"excel.xlsx");    await package.GetAsByteArray().DownloadAsync(path);    return path;}