Tag: dynamic list

如何在linq中处理空值？

recordsList.ListOfRecords = new StudentRecordsBAL() .GetStudentsList() .Select(q => new StudentRecords() { _RollNumber = q._RollNumber, _Class = q._Class, _Name = q._Name, _Address = q._Address, _City = q._City, _State = q._State, _Subjects = q._Subject, _AttendedDays = new AttendanceBAL() .GetAttendanceListOf(q._RollNumber) .Where(date => date != null) .Select(date => new DateTime(date._Date.Year, date._Date.Month, date._Date.Day)) .Distinct() .ToList(), _AttendedSubjects = GetAttendedSubjects(q._RollNumber) }).ToList(); 上述代码中的方法GetAttendanceListOf(q._RollNumber)将返回数据库中的记录列表，如果传递的“roll-no”没有记录，则返回“null”。 linq查询将终止生成错误 […]