Can you Quickly Get the Worksheet Names?

Do you want to request a feature or report a bug?

• [] Bug
• Feature

Version of ClosedXML

0.94.2

What is the current behavior?

When I want to get all names of the WorkSheets I create a new XLWorkbook and then iterate over the worksheets to get their names. My Excel File is rather big and it takes some time to create a XLWorkbook just for reading the sheetnames. I wonder if there is a way to just read the sheetnames without loading the whole content for better performance.

What is the expected behavior or new feature?

Get all sheetnames without reading all of their content (quick access).

Reproducibility

Code to reproduce problem:

public void Main()
{
    var names = new List<string>();
    // Takes some time to load just to get sheet names...
    using (var wb = new XLWorkbook("File.xlsx"))
    {
        foreach (var sheet in wb.Worksheets)
        {
            names.Add(sheet.Name);
        }
    }
}

[igitur]

@igitur was faster again 😄

Only because my day job’s project is running unit tests for 15min and I’m idling while monitoring my Gmail inbox 😉

[ll9]

Thanks you have pointed me towards the right direction. I have used OpenXML in order to acchieve my goal (takes 200ms compared to loading the whole workbook with closedXML in 4s). Here is the code for for anyone who is interested:

private static List<string> GetNamesNative()
{
    var names = new List<string>();

    using (var spreadSheetDocument = SpreadsheetDocument.Open(Path, false))
    {
        int sheetIndex = 0;
        foreach (var worksheetpart in spreadSheetDocument.WorkbookPart.WorksheetParts)
        {
            string sheetName = spreadSheetDocument.WorkbookPart.Workbook.Descendants<Sheet>().ElementAt(sheetIndex).Name;
            names.Add(sheetName);

            sheetIndex++;
        }
    }

    return names;
}