如何在工作簿中添加多个工作表 C#

Question

我正在尝试为列表中的每个学生生成多个工作表，但不确定如何实现这一点，我可以使用一个工作表成功生成 Excel 文档，但在一张工作表中显示所有学生，我如何为每个学生生成一个新工作表？我尝试使用下面的代码实现此目的，谢谢。

 public FileContentResult GenerateStudentReport([FromForm] Student Students)
        {
                int count = 0;
                Workbook workbook = new Workbook();
                Worksheet worksheet;
                foreach (var item in Students)
                {
                    worksheet = workbook.Worksheets[count];
               
                    var dataSet = new DataSet();
                    // Add the new DataTable to the DataSet.
                    dataSet.Tables.Add(table);

                    row["studentid"] = Convert.ToString(item.id);
                    row["studentName"] = Convert.ToString(item.Name);
                    row["studentSurname"] = Convert.ToString(item.Surname);...
                    table.Rows.Add(row);

                    worksheet[count].Import(table, true, 0, 0);
                    worksheet[count]["A1:V1"].Font.Bold = true;
                    worksheet[count]["A1:V1"].ColumnWidth = 300;
                    worksheet[count]["A1:V1"].Style.NumberFormat = "0.00";
                  
                     worksheet[count].Import(table, true, 0, 0);
                    count++;

               }

                byte[] docBytes = workbook.SaveDocument(DocumentFormat.Xlsx);

                return File(docBytes, "application/vnd.ms-excel", $"ExportForecastReport_{DateTime.Now.ToString("HH-mm-ss yyyyy-dd-MM")}.xlsx"); // returns a FileStreamResult 
}

尝试生成第二个工作表时抛出错误：{“工作表索引应为正数且小于工作表数。（参数‘索引’）”}

Answer 1

您应该能够通过以下方式做到这一点：

var newWorksheet = (Excel.Worksheet)this.Application.Worksheets.Add();

这个想法是，您首先向工作簿添加一个新的空工作表，然后对其进行处理（类似于您在 Excel 中手动执行的操作）

Answer 2

您可以在您的项目中使用EPPlus Nuget package，然后使用以下代码。

public IActionResult EveryExcel([FromForm] Student users)
    {
        var stream = new MemoryStream();
        ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
        using (var xlPackage = new ExcelPackage(stream)) 
        {
            int i  = 1;
            foreach(var user in users)
            {
                var worksheet = xlPackage.Workbook.Worksheets.Add($"StudentAll{i}");
                var namedStyle = xlPackage.Workbook.Styles.CreateNamedStyle($"HyperLink{i}");
                namedStyle.Style.Font.UnderLine = true;
                namedStyle.Style.Font.Color.SetColor(Color.Blue);
                const int startRow = 5;
                var row = startRow;

                worksheet.Cells["A1"].Value = "Sample";
                using (var r = worksheet.Cells["A1:C1"])
                {
                    r.Merge = true;
                    r.Style.Font.Color.SetColor(Color.White);
                    r.Style.HorizontalAlignment = OfficeOpenXml.Style.ExcelHorizontalAlignment.CenterContinuous;
                    r.Style.Fill.PatternType = OfficeOpenXml.Style.ExcelFillStyle.Solid;
                    r.Style.Fill.BackgroundColor.SetColor(Color.FromArgb(23, 55, 93));
                }

                worksheet.Cells["A4"].Value = "ID";
                worksheet.Cells["B4"].Value = "Name";
                worksheet.Cells["C4"].Value = "Surname";
                worksheet.Cells["A4:C4"].Style.Fill.PatternType = ExcelFillStyle.Solid;
                worksheet.Cells["A4:C4"].Style.Fill.BackgroundColor.SetColor(Color.FromArgb(184, 204, 228));
                worksheet.Cells["A4:C4"].Style.Font.Bold = true;

                worksheet.Cells[row, 1].Value = user.Id;
                worksheet.Cells[row, 2].Value = user.Name;
                worksheet.Cells[row, 3].Value = user.Surname;

                i++;
            }              
            xlPackage.Save();
        }
        stream.Position = 0;
        return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "students.xlsx");
    }

然后它将为每个学生生成一个新表