A method that uses EPPlus to parse a excel-file and generate a html table. Link to EPPlus nuget page: https://www.nuget.org/packages/EPPlus/. I don't take any credit for the code since I found it on the web and have only slightly modified it. But it works and I think it's worth spreading.

Parse excel-file and generate html table

private string ParseExcelFileAndGenerateHtmlTable(ExcelPackage xlPackage)
        {
            string html = "";
            int workBooks = 0;

            using (xlPackage)
            {
                var workbook = xlPackage.Workbook;
                if (workbook != null)
                {
                    if (CurrentBlock.OnlyFirstWorkSheet && workbook.Worksheets.Count > 1)
                    {
                        workBooks = 1;
                    }
                    else
                        workBooks = workbook.Worksheets.Count;

                    for (int j = 1; j <= workBooks; j++)
                    {
                        html += "<table class='table' style='border-collapse: collapse;font-family:arial;'>";
                        var worksheet = workbook.Worksheets[j];
                        
                        if (worksheet.Dimension == null) { continue; }
                        int rowCount = 0;
                        int maxColumnNumber = worksheet.Dimension.End.Column;
                        var convertedRecords = new List<List<string>>(worksheet.Dimension.End.Row);
                        var excelRows = worksheet.Cells.GroupBy(c => c.Start.Row).ToList();
                        excelRows.ForEach(r =>
                        {
                            rowCount++;
                            if (rowCount == 1) html += String.Format("<thead>");
                            if (rowCount == 2) html += String.Format("<tbody>");
                            html += String.Format("<tr>");
                            var currentRecord = new List<string>(maxColumnNumber);
                            var cells = r.OrderBy(cell => cell.Start.Column).ToList();
                            Double rowHeight = worksheet.Row(rowCount).Height;
                            for (int i = 1; i <= maxColumnNumber; i++)
                            {
                                var currentCell = cells.Where(c => c.Start.Column == i).FirstOrDefault();

                                int colSpan = 1;
                                int rowSpan = 1;

                                //check if this is the start of a merged cell
                                ExcelAddress cellAddress = new ExcelAddress(currentCell.Address);

                                var mCellsResult = (from c in worksheet.MergedCells
                                                    let addr = new ExcelAddress(c)
                                                    where cellAddress.Start.Row >= addr.Start.Row &&
                                                    cellAddress.End.Row <= addr.End.Row &&
                                                    cellAddress.Start.Column >= addr.Start.Column &&
                                                    cellAddress.End.Column <= addr.End.Column
                                                    select addr);

                                if (mCellsResult.Count() > 0)
                                {
                                    var mCells = mCellsResult.First();

                                    //if the cell and the merged cell do not share a common start address then skip this cell as it's already been covered by a previous item
                                    if (mCells.Start.Address != cellAddress.Start.Address)
                                        continue;

                                    if (mCells.Start.Column != mCells.End.Column)
                                    {
                                        colSpan += mCells.End.Column - mCells.Start.Column;
                                    }

                                    if (mCells.Start.Row != mCells.End.Row)
                                    {
                                        rowSpan += mCells.End.Row - mCells.Start.Row;
                                    }
                                }

                                //load up data
                                if (rowCount == 1)
                                    html += String.Format("<th colspan={0} rowspan={1}>{2}</th>", colSpan, rowSpan, currentCell.Value);
                                else
                                    html += String.Format("<td colspan={0} rowspan={1}>{2}</td>", colSpan, rowSpan, currentCell.Value);
                            }
                            html += String.Format("</tr>");
                            if (rowCount == 1) html += String.Format("</thead>");

                        });

                        html += String.Format("</tbody></table>");
                    }//worksheet loop
                }
            }
            return html;
        }

Hi

I want to create html table in same style as excel file.