How to set filters to header columns and set auto width

Question

. 。 Answers to this question are eligible for a +50 reputation bounty. Stefan0309 is looking for an : 的：

I need full functional solution on this based on input args from my methods.

I'm trying to edit existing code that works, and to add some features such as:

• Auto width (column width is determined by the longest text in that column)
• Header filters (put filters to all header columns that are presented)

Sources where I looked for this solutions:

• filters
• auto width

But, it seems to me that these implementations can not be applied to my case, because I have different input parameters.

Code looks like:

protected ActionResult ExportObjectList(List<string> exportColumns, List<Dictionary<string, string>> valueList, string fileName)
{
    string exportFileName = fileName.IndexOf("xlsx") < 0 ? fileName + ".xlsx" : fileName;
    byte[] fileBytesArray = ExportDataToExcell(exportColumns, valueList, exportFileName);
    return File(fileBytesArray, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", exportFileName);
}
private byte[] ExportDataToExcell(List<string> exportColumns, List<Dictionary<string, string>> valueList, string fileName)
{
    MemoryStream memoryStream = new MemoryStream();
    using (SpreadsheetDocument document = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook))
    {
        WorkbookPart workbookPart = document.AddWorkbookPart();
        WorksheetPart sheetPart = document.WorkbookPart.AddNewPart<WorksheetPart>();
        SheetData sheetData = new SheetData();
        sheetPart.Worksheet = new Worksheet(sheetData);

        document.WorkbookPart.Workbook = new Workbook();

        document.WorkbookPart.Workbook.Sheets = new Sheets();

        Sheets sheets = document.WorkbookPart.Workbook.GetFirstChild<Sheets>();
        string relationshipId = document.WorkbookPart.GetIdOfPart(sheetPart);

        uint sheetId = 1;
        if (sheets.Elements<Sheet>().Count() > 0)
        {
            sheetId =
                sheets.Elements<Sheet>().Select(s => s.SheetId.Value).Max() + 1;
        }

        Sheet sheet = new Sheet() { Id = relationshipId, SheetId = sheetId, Name = "ExportDataSheet" };
        sheets.Append(sheet);

        Row headerRow = new Row();

        foreach (string headerCell in exportColumns)
        {

            Cell keyCell = new Cell();
            keyCell.DataType = CellValues.String;
            keyCell.CellValue = new CellValue(headerCell);
            headerRow.AppendChild(keyCell);
        }

        sheetData.AppendChild(headerRow);
        //AutoFilter autoFilter = new AutoFilter() { Reference = "A1:K9" };
        foreach (Dictionary<string, string> itemList in valueList)
        {
            Row newRow = new Row();
            foreach (string headerCell in exportColumns)
            {
                //foreach (var singleRowValues in itemList.Value)
                // {
                Cell cell = new Cell();
                cell.DataType = CellValues.String;
                cell.CellValue = new CellValue(itemList[headerCell]); //
                newRow.AppendChild(cell);

                //}

            }
            sheetData.AppendChild(newRow);
        }

    //should I add here just this lines:
    //Columns columns = AutoSize(sheetData);
    //sheetPart.Worksheet.Append(columns);

    }
    return memoryStream.ToArray();

}

My insecurities:

• Appending filter - I should know exact sequence spot where to put in, and I dont know how to calculate reference (for example A1: J100, but it wont be always that range, it should be somehow dynamically)
• Auto width - I'm aware that I need to calculate each column width manually, but Im not sure where to add it...maybe at the end (view my comments in the code)

Answer 1

The links you have provided is outdated and would be applicable for older versions of .net framework.

• To access SheetAutoFilter object use the Worksheet.AutoFilter property. The AutoFilterBase interface provides methods and properties to apply, clear or disable a filter and sort values in the filtered range. While calling the SheetAutoFilter.Apply method pass the CellRange object to enable filtering, reference link

  // Enable filtering for the specified cell range. CellRange range = sheet["A1:K9"]; sheet.AutoFilter.Apply(range);

• For implementing code for auto width, reference link

  • include this chunk of code along with appending sheetdata

   //get your columns (where your width is set) Columns columns = AutoSize(sheetData); //add to a WorksheetPart.WorkSheet sheetPart.Worksheet = new Worksheet(); sheetPart.Worksheet.Append(columns); sheetPart.Worksheet.Append(sheetData);

  • you also need to include functions AutoSize and GetMaxCharacterWidth

   private Columns AutoSize(SheetData sheetData) { var maxColWidth = GetMaxCharacterWidth(sheetData); Columns columns = new Columns(); //this is the width of my font - yours may be different double maxWidth = 7; foreach (var item in maxColWidth) { //width = Truncate([{Number of Characters} * {Maximum Digit Width} + {5 pixel padding}]/{Maximum Digit Width}*256)/256 double width = Math.Truncate((item.Value * maxWidth + 5) / maxWidth * 256) / 256; //pixels=Truncate(((256 * {width} + Truncate(128/{Maximum Digit Width}))/256)*{Maximum Digit Width}) double pixels = Math.Truncate(((256 * width + Math.Truncate(128 / maxWidth)) / 256) * maxWidth); //character width=Truncate(({pixels}-5)/{Maximum Digit Width} * 100+0.5)/100 double charWidth = Math.Truncate((pixels - 5) / maxWidth * 100 + 0.5) / 100; Column col = new Column() { BestFit = true, Min = (UInt32)(item.Key + 1), Max = (UInt32)(item.Key + 1), CustomWidth = true, Width = (DoubleValue)width }; columns.Append(col); } return columns; } private Dictionary<int, int> GetMaxCharacterWidth(SheetData sheetData) { //iterate over all cells getting a max char value for each column Dictionary<int, int> maxColWidth = new Dictionary<int, int>(); var rows = sheetData.Elements<Row>(); UInt32[] numberStyles = new UInt32[] { 5, 6, 7, 8 }; //styles that will add extra chars UInt32[] boldStyles = new UInt32[] { 1, 2, 3, 4, 6, 7, 8 }; //styles that will bold foreach (var r in rows) { var cells = r.Elements<Cell>().ToArray(); //using cell index as my column for (int i = 0; i < cells.Length; i++) { var cell = cells[i]; var cellValue = cell.CellValue == null ? string.Empty : cell.CellValue.InnerText; var cellTextLength = cellValue.Length; if (cell.StyleIndex != null && numberStyles.Contains(cell.StyleIndex)) { int thousandCount = (int)Math.Truncate((double)cellTextLength / 4); //add 3 for '.00' cellTextLength += (3 + thousandCount); } if (cell.StyleIndex != null && boldStyles.Contains(cell.StyleIndex)) { //add an extra char for bold - not 100% acurate but good enough for what i need. cellTextLength += 1; } if (maxColWidth.ContainsKey(i)) { var current = maxColWidth[i]; if (cellTextLength > current) { maxColWidth[i] = cellTextLength; } } else { maxColWidth.Add(i, cellTextLength); } } } return maxColWidth; }