问如何在c#中使用microsoft.office.interop.excel只获得一次excel文件的合并单元格

EN

public void ImportXLX()
    {
        Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();

        Microsoft.Office.Interop.Excel.Workbook wb = app.Workbooks.Open(@"C:\Users\Vipin\Desktop\Sheets\MyXL6.xlsx", Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                Type.Missing, Type.Missing);

        int workSheetCounts = wb.Worksheets.Count;

        for (int sheetCounter = 1; sheetCounter <= workSheetCounts; sheetCounter++)
        {
            Microsoft.Office.Interop.Excel.Worksheet workSheet = wb.Sheets[sheetCounter];

            Range excelRange = workSheet.UsedRange;
            Range objRange = null;

            int rowCount = 0;
            float totalRowWidth = 0;
            foreach (Microsoft.Office.Interop.Excel.Range row in excelRange.Rows)
            {
                rowCount++;
                totalRowWidth = row.Width;
                int colCount = 0;

                foreach (Microsoft.Office.Interop.Excel.Range c in row.Cells)
                {
                    colCount++;
                    objRange = workSheet.Cells[rowCount, colCount];

                    double width = 0;
                    double height = 0;
                    string colVal = null;

                    if (objRange.MergeCells)
                    {
                        colVal = Convert.ToString(((Range)objRange.MergeArea[1, 1]).Text).Trim();
                        width = objRange.MergeArea.Width;
                        height = objRange.MergeArea.Height;


                    }
                    else
                    {
                        colVal = Convert.ToString(objRange.Text).Trim();
                        width = objRange.Width;
                        height = objRange.Height;
                    }
                    Debug.Write("objRange = " + objRange + " rowCount = " + rowCount + " Width = " + width + " height = " + height + "TotalColumnWidth = " + totalRowWidth + "TotalRowHeight = " + totalColHeight + " \n ");
                }
            }
        }
        app.Quit();
    }