我有此参与者模型DbSet<Participants>
:
public class Participant {
public Guid Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public int IsCaptain { get; set; }
public Guid TeamId { get; set; }
[ForeignKey("TeamId")]
public Team Team { get; set; }
}
此ParticipantDataView DbQuery<ParticipantsDataView>
:
public class ParticipantDataView {
public Guid Id { get; set; } // = Participant.Id
public double? FirstWeight { get; set; }
public double? LastWeight { get; set; }
public double? WeightLoss => FirstWeight - LastWeight;
public Participant Participant { get; set; }
}
DbContext:
public class DBContext : DbContext {
public DBContext(DbContextOptions<DBContext> options) : base(options) {}
public DbSet<Participant> Participants { get; set; }
public DbQuery<ParticipantDataView> ParticipantsDataView { get; set; }
}
我的查询:
Participants = await _context.ParticipantsDataView
.Include(p => p.Participant)
.ThenInclude(t => t.Team)
.Where(p => p.Participant.Status == 1 && p.Participant.Team.Status == 1).OrderBy(p => p.WeightLoss)
.AsNoTracking()
.ToListAsync();
错误:
SqlNullValueException: Data is Null.
This method or property cannot be called on Null values.
ParticipantDataView中的每个项目在Participant中都有一个匹配项,所以我不知道为什么会出现此错误?