来自HRESULT的异常：get_Address上的0x800A01A8

Question

我正在尝试使用下面显示的方法在excel文件中搜索，但我收到的错误是

  

System.Runtime.InteropServices.COMException未处理消息：   来自HRESULT的异常：0x800A01A8

在下面的代码行

if (currentRange.get_Address(true, true, Excel.XlReferenceStyle.xlR1C1).Equals(startAddress))

方式

    private void SearchResults(Excel.Range usedRange, string searchString, System.Data.DataTable dt)
    {
        Excel.Range startAddress = null;
        Excel.Range currentRange;

        currentRange = usedRange.Find(TB_First_Name.Text,
                                      Type.Missing,
                                      Excel.XlFindLookIn.xlValues,
                                      Excel.XlLookAt.xlPart,
                                      Excel.XlSearchOrder.xlByRows,
                                      Excel.XlSearchDirection.xlNext,
                                      false,
                                      Type.Missing,
                                      Type.Missing);

        while (currentRange != null)
        {
            //Keep track of the first range you find.
            if (startAddress == null)
            {
                startAddress = currentRange;
            }
            //if current address is same as the starting address stop searching
            else if (currentRange.get_Address(true, true, Excel.XlReferenceStyle.xlR1C1).Equals(startAddress))
            {
                break;
            }
            //keep searching for next value
            currentRange = usedRange.FindNext(currentRange);
            AddExcelRowToDataTable(usedRange, currentRange, dt);
        }
    }