.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; }