Preservation of sparklines and slicers in Excel Files

GemBox.Spreadsheet supports many Microsoft Excel and LibreOffice (or Open Office) features, but not all. You can preserve unsupported features when reading a workbook so that they are not lost when writing to a workbook of the same format.

You can read more about GemBox.Spreadsheet's preservation feature on the Preservation help page.

The following example shows how to preserve sparklines and slicers in an Excel file from input to output using C# and VB.NET.

Reading and writing Excel file with preserved sparklines and slicers
Screenshot of Excel file with preserved sparklines and slicers
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using System;
using GemBox.Spreadsheet;

class Program
{
    static void Main()
    {
        // If using Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

        // Load Excel file with preservation feature enabled.
        var loadOptions = new XlsxLoadOptions() { PreserveUnsupportedFeatures = true };
        var workbook = ExcelFile.Load("%InputFileName%", loadOptions);

        // Modify all values in column C, set them to some random value.
        var readEnumerator = workbook.Worksheets[0].Columns["C"].Cells.GetReadEnumerator();
        var random = new Random();
        while (readEnumerator.MoveNext())
        {
            var cell = readEnumerator.Current;
            if (cell.ValueType == CellValueType.Int)
                cell.SetValue(random.Next(-10, 10));
        }

        workbook.Save("Preserved Output.xlsx");
    }
}
Imports System
Imports GemBox.Spreadsheet

Module Program

    Sub Main()

        ' If using Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

        ' Load Excel file with preservation feature enabled.
        Dim loadOptions As New XlsxLoadOptions() With {.PreserveUnsupportedFeatures = True}
        Dim workbook = ExcelFile.Load("%InputFileName%", loadOptions)

        ' Modify all values in column C, set them to some random value.
        Dim readEnumerator = workbook.Worksheets(0).Columns("C").Cells.GetReadEnumerator()
        Dim random As New Random()
        While readEnumerator.MoveNext()

            Dim cell = readEnumerator.Current
            If cell.ValueType = CellValueType.Int Then cell.SetValue(random.Next(-10, 10))

        End While

        workbook.Save("Preserved Output.xlsx")

    End Sub
End Module

See also


Next steps

GemBox.Spreadsheet is a .NET component that enables you to read, write, edit, convert, and print spreadsheet files from your .NET applications using one simple API.

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