Generate a flat list of all excel cell formulas

Question

I have a massive program written with VBA and cell formulas. I am tasked to reverse engineer it into C# winforms. I figured for a start, I need to see all the cell formulas

Answer 1

With help from brettdj, I managed to whip up a quad tree search at the moment

private static void FindFormula(Excel excel, TextWriter writer, int rowstart, int rowend, int colstart, int colend)
{
    // Select the range
    excel.Range(rowstart, rowend, colstart, colend);

    // Check whether this range has formulas
    if (!excel.RangeHasFormula())
        return;

    // Check if we only have a single cell
    if (excel.RangeCellCount() == 1)
    {
        Console.WriteLine(excel.CellFormula(rowstart, colstart));
        return;
    }

    int r1, r2, r3, r4;
    int c1, c2, c3, c4;

    r1 = rowstart;
    r2 = rowstart + (rowend - rowstart + 1) / 2 - 1;
    r3 = r2 + 1;
    r4 = rowend;

    if (colstart == colend)
    {
        c1 = c2 = c3 = c4 = colstart;

        FindFormula(excel, writer, r1, r2, c1, c2);
        FindFormula(excel, writer, r3, r4, c1, c2);
    }
    else
    {
        c1 = colstart;
        c2 = colstart + (colend - colstart + 1) / 2 - 1;
        c3 = c2 + 1;
        c4 = colend;

        FindFormula(excel, writer, r1, r2, c1, c2);
        FindFormula(excel, writer, r1, r2, c3, c4);
        FindFormula(excel, writer, r3, r4, c1, c2);
        FindFormula(excel, writer, r3, r4, c3, c4);
    }
}