EPPlus

Question

我正在使用 EPPlus。我的要求是将 excel file 作为 attachment 发送。因此，我通过定义列然后添加行来填充 DataTable。

一切正常。直到附件到达电子邮件。但是当 Excel 文件打开时 Columns which i have defined are missing。行显示正确。

.....
MemoryStream ms = new MemoryStream();
ms = DataTableToExcelXlsx(dt, "Attendance");
ms.Position = 0;
Attachment file = new Attachment(ms, "Attendance.xlsx");
message.Attachments.Add(file);
.....
smtp.Send(message);

...

public static MemoryStream DataTableToExcelXlsx(DataTable table, string sheetName)
        {
            MemoryStream Result = new MemoryStream();
            ExcelPackage pack = new ExcelPackage();
            ExcelWorksheet ws = pack.Workbook.Worksheets.Add(sheetName);

            int col = 1;
            int row = 1;
            foreach (DataRow rw in table.Rows)
            {
                foreach (DataColumn cl in table.Columns)
                {
                    if (rw[cl.ColumnName] != DBNull.Value)
                        ws.Cells[row, col].Value = rw[cl.ColumnName].ToString();
                    col++;
                }
                row++;
                col = 1;
            }

            pack.SaveAs(Result);
            return Result;
        }

为什么列没有出现在 Excel 中。它们存在于数据表中。这个问题的解决方案是什么？

Answer 1

我没有添加列，这就是它们没有出现的原因:-

// Columns
            int rowIndex = 1;
            int colIndex = 1;
            foreach (DataColumn dc in table.Columns) //Creating Headings
            {
                var cell = ws.Cells[rowIndex, colIndex];

                //Setting the background color of header cells to Gray
                var fill = cell.Style.Fill;
                fill.PatternType = ExcelFillStyle.Solid;
                fill.BackgroundColor.SetColor(Color.LightGray);

                //Setting Top/left,right/bottom borders.
                var border = cell.Style.Border;
                border.Bottom.Style = border.Top.Style = border.Left.Style = border.Right.Style = ExcelBorderStyle.Thin;

                //Setting Value in cell
                cell.Value = dc.ColumnName;

                colIndex++;
            }

            // Rows
            int col = 1;
            int row = 2;
            foreach (DataRow rw in table.Rows)
            {
                foreach (DataColumn cl in table.Columns)
                {
                    if (rw[cl.ColumnName] != DBNull.Value)
                        ws.Cells[row, col].Value = rw[cl.ColumnName].ToString();
                    col++;
                }
                row++;
                col = 1;
            }

            pack.SaveAs(Result);
            return Result;

Answer 2

XlsIO is a .NET library that reads and writes Excel 2003/2007/2010/2013/2016 files. Using XlsIO, you can import data table xls/xlsx document very easily. The whole suite of controls is available for free (commercial applications also) through the community license program 如果您符合条件。社区许可证是没有限制或水印的完整产品。

步骤 1：创建控制台应用程序

第 2 步： 添加对 Syncfusion.XlsIO.Base 和 Syncfusion.Compression.Base 的引用；您也可以使用 NuGet 将这些引用添加到您的项目中。

第 3 步：复制并粘贴以下代码片段。

以下代码片段说明了如何使用 XlsIO 从最后一行开始填充新行

using (ExcelEngine excelEngine = new ExcelEngine())
{
    //Instantiate the excel application object.
    IApplication application = excelEngine.Excel;

    application.DefaultVersion = ExcelVersion.Excel2013;

    //Create a workbook with single worksheet
    IWorkbook workbook = application.Workbooks.Create(1);

    IWorksheet worksheet = workbook.Worksheets[0];

    //Style definition 
    IStyle style = workbook.Styles.Add("Border");
    style.Borders.Color = ExcelKnownColors.Black;
    style.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
    style.Borders[ExcelBordersIndex.EdgeLeft].LineStyle = ExcelLineStyle.Thin;
    style.Borders[ExcelBordersIndex.EdgeRight].LineStyle = ExcelLineStyle.Thin;
    style.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;

    //Import data table
    worksheet.ImportDataTable(GetDataTable(), true, 1, 1);

    //Assgin created border
    worksheet.UsedRange.CellStyle = style;
    //Autofit columns
    worksheet.UsedRange.AutofitColumns();
    //Save the excel document
    using (MemoryStream excelStream = new MemoryStream())
    {
        workbook.SaveAs(excelStream);
        workbook.Close();

        excelStream.Position = 0;
        System.Net.Mail.Attachment oAttachment = new System.Net.Mail.Attachment(excelStream, "DataTableImported.xlsx");
    }
}

有关 XlsIO 的更多信息，请参阅我们的 help documentation

注意：我为 Syncfusion 工作

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c#

excel