C＃Interop Excel：检查范围是否仅包含一个合并单元格

Question

我签出了answer for the question "how to detect merged cells in c# using MS interop excel"，它确实确定范围是否包含合并的单元格。但是，我想确定范围是否包含一个合并的单元格。这是我的excel工作表的样子（顶部和左侧的字母分别是列号和行号）：

    1   2   3   4   5
  +-------+-------+---+
1 | Apple | Orange| G |
  +---+---+-------+---+
2 | 1 | 2 | 3 | 4 | 5 |
  +---+---+---+---+---+

如您所见，有两个合并的行彼此相邻。结果，mergeCells将为true：

bool mergeCells = xlWorksheet.Range[xlWorksheet.Cells[/*row*/1, /*column*/1], xlWorksheet.Cells[/*row*/1, /*column*/3]].MergeCells;

但是，如果我像这样格式化excel单元格，则mergeCells将为false：

    1   2   3   4   5
  +-------+---+-------+
1 | Apple | G | Orange|
  +---+---+---+-------+
2 | 1 | 2 | 3 | 4 | 5 |
  +---+---+---+---+---+

这是我项目中的所有代码。它抓住了每个顶部单元格的宽度：

    List<int> ColumbWidth = new List<int>();

    int i = 0;
    int row = 1;
    int ColLeft = 1;
    int ColRight = 1;

    while (xlWorksheet.Cells[row, ColRight].Value2 != null)
    {
        object mergeCells = xlWorksheet.Range[xlWorksheet.Cells[row, ColLeft], xlWorksheet.Cells[row, ColRight]].MergeCells;

        if (ColumbWidth.Count != 0 && mergeCells != DBNull.Value && (bool)mergeCells) //still reading merged column
        {
            ColumbWidth[i]++;
        }
        else
        {
            ColumbWidth.Add(1);

            if (ColumbWidth.Count != 1)
            {
                i++;
                ColLeft = ColRight;
            }
        }

        ColRight++;
    }