处理相关实体的Null值

Question

如果从相关实体中找不到匹配结果，我想设置默认值。

我试图显示来自第一个实体的所有值，但显示来自第二个表的两个值，第二个表中的任何一个值或两个值都可以为null。这是我的查询

var employeelist = _context.TblEmployee.ToList();

    foreach (var employee in employeelist)
    {               
        var employeeAtt = _context.AttendanceTable

            .GroupBy(a => a.DateAndTime.Date)
                .Select(g => new EmployeeAtt
                {
                    Date = g.Key,
                    Emp_name = employee.EmployeeName,
                    InTime = g.Where(e => e.ScanType == "I").Min(e => e.DateAndTime.TimeOfDay),
                    OutTime = g.Where(e => e.ScanType == "O").Max(e => e.DateAndTime.TimeOfDay),

                });
        empWithDate.AddRange(employeeAtt);
    }

如果值是NULL，我希望InTime和OutTime存储“缺席”。

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