Question

I used this code snippet to export data to Excel using Open XML.

The code was in VB.Net so I converted it to C#. It’s working fine with only one (annoying) glitch. The last cell (Z5) is blank. When I used the VB.Net version it’s filling all the cells. I manually compared the C# vs the VB.Net code but it’s functionally similar byte by byte. But still it’s not able to fill up the last cell. Any idea why?

C# version of the code is below for your reference:

protected void Export()
{
    Response.ClearHeaders();
    Response.ClearContent();
    Response.Clear();
    Response.Buffer = true;
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml";
    //"application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" '"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" '"application/vnd.ms-excel"
    Response.AddHeader("content-disposition", "attachment; filename=Test.xlsx");
    Response.Charset = "";
    this.EnableViewState = false;
    MemoryStream ms = new MemoryStream();
    SpreadsheetDocument objSpreadsheet = SpreadsheetDocument.Create(ms, SpreadsheetDocumentType.Workbook);
    WorkbookPart objWorkbookPart = objSpreadsheet.AddWorkbookPart();
    objWorkbookPart.Workbook = new Workbook();
    WorksheetPart objSheetPart = objWorkbookPart.AddNewPart<WorksheetPart>();
    objSheetPart.Worksheet = new Worksheet(new SheetData());
    Sheets objSheets = objSpreadsheet.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());
    Sheet objSheet = new Sheet();
    objSheet.Id = objSpreadsheet.WorkbookPart.GetIdOfPart(objSheetPart);
    objSheet.SheetId = 1;
    objSheet.Name = "mySheet";
    objSheets.Append(objSheet);

    for (int intRow = (int)('A'); intRow <= (int)('Z'); intRow++)
    {
        for (uint intCol = 1; intCol <= 5; intCol++)
        {
            Cell objCell = InsertCellInWorksheet(Convert.ToString((char)intRow), intCol, objSheetPart);
            objCell.CellValue = new CellValue("This was a test: " + Convert.ToString((char)intRow) + intCol.ToString());
            objCell.DataType = new EnumValue<CellValues>(CellValues.String);
            objSpreadsheet.WorkbookPart.Workbook.Save();
        }
    }


    objSpreadsheet.WorkbookPart.Workbook.Save();
    objSpreadsheet.Close();
    ms.WriteTo(Response.OutputStream);
    Response.Flush();
    Response.End();
}

private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
{
    Worksheet worksheet = worksheetPart.Worksheet;
    var sheetData = worksheet.GetFirstChild<SheetData>();
    string cellReference = columnName + rowIndex;

    // If the worksheet does not contain a row with the specified row index, insert one.
    Row row;
    if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
    {
        row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
    }
    else
    {
        row = new Row { RowIndex = rowIndex };
        sheetData.Append(row);
    }

    // If there is not a cell with the specified column name, insert one.  
    if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
    {
        return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
    }
    // Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
    Cell refCell = row.Elements<Cell>().FirstOrDefault(cell => string.Compare(cell.CellReference.Value, cellReference, true) > 0);

    var newCell = new Cell { CellReference = cellReference };
    row.InsertBefore(newCell, refCell);

    worksheet.Save();
    return newCell;
}

Answer 1

Issue is resolved. I made a small change to the code to make it work. Instead of saving the sheet inside InsertCellInWorksheet method. I am saving the sheet outside the for loops. Here is the working version of the code.

protected void Export()
{
    Response.ClearHeaders();
    Response.ClearContent();
    Response.Clear();
    Response.Buffer = true;
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml";
    //"application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml" '"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" '"application/vnd.ms-excel"
    Response.AddHeader("content-disposition", "attachment; filename=Test.xlsx");
    Response.Charset = "";
    this.EnableViewState = false;
    MemoryStream ms = new MemoryStream();
    SpreadsheetDocument objSpreadsheet = SpreadsheetDocument.Create(ms, SpreadsheetDocumentType.Workbook);
    WorkbookPart objWorkbookPart = objSpreadsheet.AddWorkbookPart();
    objWorkbookPart.Workbook = new Workbook();
    WorksheetPart objSheetPart = objWorkbookPart.AddNewPart<WorksheetPart>();
    objSheetPart.Worksheet = new Worksheet(new SheetData());
    Sheets objSheets = objSpreadsheet.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());
    Sheet objSheet = new Sheet();
    objSheet.Id = objSpreadsheet.WorkbookPart.GetIdOfPart(objSheetPart);
    objSheet.SheetId = 1;
    objSheet.Name = "mySheet";
    objSheets.Append(objSheet);

    for (int intRow = (int)('A'); intRow <= (int)('Z'); intRow++)
    {
        for (uint intCol = 1; intCol <= 5; intCol++)
        {
            Cell objCell = InsertCellInWorksheet(Convert.ToString((char)intRow), intCol, objSheetPart);
            objCell.CellValue = new CellValue("This was a test: " + Convert.ToString((char)intRow) + intCol.ToString());
            objCell.DataType = new EnumValue<CellValues>(CellValues.String);
        }
    }
    objSheetPart.Worksheet.Save();
    objSpreadsheet.WorkbookPart.Workbook.Save();
    objSpreadsheet.Close();
    ms.WriteTo(Response.OutputStream);
    Response.Flush();
    Response.End();
}

private static Cell InsertCellInWorksheet(string columnName, uint rowIndex, WorksheetPart worksheetPart)
{
    Worksheet worksheet = worksheetPart.Worksheet;
    var sheetData = worksheet.GetFirstChild<SheetData>();
    string cellReference = columnName + rowIndex;

    // If the worksheet does not contain a row with the specified row index, insert one.
    Row row;
    if (sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
    {
        row = sheetData.Elements<Row>().Where(r => r.RowIndex == rowIndex).First();
    }
    else
    {
        row = new Row { RowIndex = rowIndex };
        sheetData.Append(row);
    }

    // If there is not a cell with the specified column name, insert one.  
    if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
    {
        return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).First();
    }
    // Cells must be in sequential order according to CellReference. Determine where to insert the new cell.
    Cell refCell = row.Elements<Cell>().FirstOrDefault(cell => string.Compare(cell.CellReference.Value, cellReference, true) > 0);

    var newCell = new Cell { CellReference = cellReference };
    row.InsertBefore(newCell, refCell);

    //worksheet.Save();
    return newCell;
}

Not sure how it worked in VB.Net 🙂