public void SetUp()
        {
            var book = Workbook.Open(@"TestData\Book1.xlsx");

            いろいろなデータ = book.Sheets["いろいろなデータ"];

            a1 = いろいろなデータ.Cells["A1"];
            b1 = いろいろなデータ.Cells["B1"];
            a2 = いろいろなデータ.Cells["A2"];
            b2 = いろいろなデータ.Cells["B2"];
            a3 = いろいろなデータ.Cells["A3"];
            b3 = いろいろなデータ.Cells["B3"];
        }
 private Cell GetItem(CellName cellName)
 {
     if (!cache.ContainsKey(cellName))
     {
         var cellXml =
             from cell in sheet.WorksheetPart.Worksheet.Descendants<Spreadsheet.Cell>()
             where cell.CellReference == cellName.ToString()
             select cell;
         if (cellXml.Any())
         {
             cache[cellName] = new Cell(sheet, cellXml.Single());
         }
         else
         {
             cache[cellName] = new Cell(sheet, cellName.ToString());
         }
     }
     return cache[cellName];
 }