如何确定合并范围内的哪些单元格可见并可以有值？

Question

I need to find out which Cells of a Range are not visible in ranges which are merged. I need to include empty cells but I want to exclude cells that are not visible as a result of merging cells. (Only one cell, row, column in a merged range can contain a non empty value...?).

I have a following code:

    using (XLWorkbook wb = new XLWorkbook(ExcelFile.FullName))
    {
        foreach (IXLNamedRange r in wb.NamedRanges)
        {
                foreach (var c in r.Ranges.Cells())
                {
                    if (c.IsMerged() /*&& something*/)
                        continue;
                    /*Do processing of visible values*/

I need to get visible cells from merged ranges that would contain values if the value is filled in, ie without using IsEmpty() . I can determine, if the range is merged, but how can I add a condition to include only visible cells? Is it always the first column/row? IsMerged() returns true on all cells in a merged range not only on those that are not visible and cannot contain a value.

Example problem:

A named range has the address C21:D33. I need values of C21:C33 but I do not need to include values D21:D33 - they are all always null. But the values of C21:C33 can also be null or empty, but I need them all. D21:D33 cannot contain anything else but null, but C21:C33 can contain a non null value. I need all the cells that can be non empty.

Answer 1

This code finds the cells C21:C33 :

using (var wb = new XLWorkbook("test.xlsx"))
{
    var nr = wb.NamedRange("MyRange");
    foreach (var range in nr.Ranges)
    {
        var cellsToFind = range.Cells(c => c.MergedRange().FirstCell() == c);

        Console.WriteLine($"{cellsToFind.First().Address}:{cellsToFind.Last().Address}");
    }
}