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Count range cells eliminating merge cells

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Last Modified: 2013-11-10
I have created a method to count the number of cells in a range taking into consideration that merged cell are counted as one cell.

Here is the method

private static int getRangeCount(Range Target)
{
      if (Target == null)
            return 0;
      if (Target.Cells == null)
            return 0;
      if (Target.Cells.Count <= 1)
            return Target.Cells.Count;
      int count = 0;
      foreach (Range cell in Target)
      {
            if (cell.MergeCells != null && cell.MergeCells is bool && (bool)cell.MergeCells)
            {
                  Range rng = (Range)cell.MergeArea[1, 1];
                  if (!Microsoft.Office.Tools.Excel.ExcelLocale1033Proxy.ReferenceEquals(cell, rng))
                  {
                        string str1 = WorkbookUtils.GetAddress(cell, XlReferenceStyle.xlA1);
                        string str2 = WorkbookUtils.GetAddress(rng, XlReferenceStyle.xlA1);
                        if (str1 == str2)
                              count++;
                  }
            }
            else
                  count++;
      }
      return count;
}
My problem now is that a user is using this method on a range with 8448 cells. Because the target is so big the method takes a very very very long time.

Is there a way to improve the above code?

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