如何在导出网格数据时忽略空引用？

Question

我在jqgrid表中加载客户详细信息。 使用Open XML我正在导出我的网格数据。这是问题所在。我的一个单元格在数据库中具有null值。现在，在导出时，我将对象引用未设置为实例。如何忽略这个问题？

请帮帮我。尝试使用谷歌搜索但无法找到任何解决方案。

public string ExportReport(int cp, int noOfOrders)
{
    string conndb=ConfigurationManager.AppSettings["Db"];
    const string Ids ="0";
    Company pList = _items.GetByCID(cp);
    IQueryable<Product> List

    List=product.SQLDatabase().GetListByCompandIds(cp, Convert.ToInt32(noOfOrders), conndb, Ids)

    XLWorkbook workbook = new XLWorkbook(XLEventTracking.Disabled);
    IXLWorksheet worksheet = workbook.Worksheets.Add("ListReport");




        worksheet.Cell(1, 1).Value = "Customer Id";
        worksheet.Cell(1, 2).Value = "First Name";
        worksheet.Cell(1, 3).Value = "Last Name";
        worksheet.Cell(1, 4).Value = "Email";
        worksheet.Cell(1, 5).Value = "Department";
        worksheet.Cell(1, 6).Value = "Supervisor";


        int i = 2;
        foreach (EList ExpReport in List)
        {
            worksheet.Cell(i, 1).SetValue(ExpReport.CustomerId);
            worksheet.Cell(i, 2).SetValue(ExpReport.FirstName);  //*Here is where I am having error*
            worksheet.Cell(i, 3).SetValue(ExpReport.LastName);
            worksheet.Cell(i, 4).SetValue(ExpReport.Email);
            worksheet.Cell(i, 5).SetValue(ExpReport.Department);
            worksheet.Cell(i, 6).SetValue(ExpReport.Supervisor);
            ++i;
        }


        worksheet.Columns().AdjustToContents();
        Session["Workbook"] = workbook;
        string filename;
        filename = "Product-Report";
        return filename;
}

示例：

For Example:

CustomerId      FirstName       LastName        Email        Department     Supervisor
123654          Adam            Ad              aa@abc.com   IT             Mike
456987                          Ferna           tf@abc.com   BA             Alferd
78931           Smith           Lopez           sl@abc.com   BA             Alfred
123456          John            Horvath         jh@abc.com   IT             Micheal
456789                          Cruise          cc@abc.com   BA             Alferd
78931           Jackson         Ville           JV@abc.com   BA             Alfred