c# - Get Merged Cell Area with EPPLus

Question

I'm using EPPlus to read excel files.

I have a single cell that is part of merged cells. How do I get the merged range that this cell is part of?

For example:

Assume Range ("A1:C1") has been merged.

Given Range "B1" it's Merge property will be true but there isn't a way to get the merged range given a single cell.

How do you get the merged range?

I was hoping for a .MergedRange which would return Range("A1:C1")

Answer 1

There is no such property out of the box but the worksheet has a MergedCells property with an array of all the merged cell addresses in the worksheet and a GetMergeCellId() method which will give you the index for a given cell address.

We can therefore combine these into a little extension method you can use to get the address. Something like this:

public static string GetMergedRangeAddress(this ExcelRange @this)
{
    if (@this.Merge)
    {
        var idx = @this.Worksheet.GetMergeCellId(@this.Start.Row, @this.Start.Column);
        return @this.Worksheet.MergedCells[idx-1]; //the array is 0-indexed but the mergeId is 1-indexed...
    }
    else
    {
        return @this.Address;
    }
}

which you can use as follows:

using (var excel = new ExcelPackage(new FileInfo("inputFile.xlsx")))
{
    var ws = excel.Workbook.Worksheets["sheet1"];
    var b3address = ws.Cells["B3"].GetMergedRangeAddress();

}

(Note that in the event that you use this method on a multi-celled range it will return the merged cell address for the first cell in the range only)