_context.Homestays
.Include(x => x.CreatedUser)
.Include(x => x.UpdatedUser)
.Include(x => x.HomestayEvaluations)
.Include(x => x.HomestayContracts)
.Include(x => x.HomestayPoliceChecks)
.Include(x => x.HomestayHouseHolds)
.AsNoTracking()
.Select(x => new Homestay()
{
HomestayId = x.HomestayId,
HomestayFamily = ConstValue.GetHomestayFamilyName(x),
Address = x.Address,
Score = x.HomestayEvaluations.Any(x1 => x1.IsEvaluationActive) ? x.HomestayEvaluations.LastOrDefault(x1 => x1.IsEvaluationActive).GetScore() : 0,
Contract = x.HomestayContracts.Any(x1 => x1.IsContractActive) ? x.HomestayContracts.LastOrDefault(x1 => x1.IsContractActive).ContractDate : null,
Students = x.Students,
HouseHolders = x.HomestayHouseHolds.Count(x1 => x1.IsHouseHoldActive),
PoliceCheck = x.HomestayPoliceChecks.Any(x1 => x1.IsPoliceCheckActive) ? x.HomestayPoliceChecks.LastOrDefault(x1 => x1.IsPoliceCheckActive).PoliceCheckDate : null,
Language = x.Language,
Room = x.Room,
IsActive = x.IsActive,
CreatedDate = x.CreatedDate,
CreatedUserName = ConstValue.GetUserName(x.CreatedUser),
UpdatedDate = x.UpdatedDate,
UpdatedUserName = ConstValue.GetUserName(x.UpdatedUser)
})
.OrderByDescending(x => x.HomestayId);
Hello, Im wonder that how do I change my select query better ?
This code as below that it looks messy. first excute any and if it is true, get last one. but is there any more short code ??
Contract = x.HomestayContracts.Any(x1 => x1.IsContractActive) ? x.HomestayContracts.LastOrDefault(x1 => x1.IsContractActive).ContractDate : null
I tried without any(), it occred error as null object if there is no data.
Please help me.
Thanks :)
Use this
Contract = x.HomestayContracts.LastOrDefault(x1 => x1.IsContractActive)?.ContractDate ?? null
Also you can disable lazy loading for this query in context's configuration
context.Configuration.LazyLoadingEnabled = false;
This way you can eliminate Include methods, cause shorter statement but not better performance. Use stored procedure for performance. Stored Procedure in Entity Framework
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