Question

I have a column in my table called DateTimeOfBid, I need to fetch all entities where DateTimeOfBid is within 30 days of today.

I’m using Entity-Framework 4 to access my data.

Here’s what I have so far:

EFUserAuctionLanceRepository userAuctionLanceRepository = new EFUserAuctionLanceRepository();

var potentialDiscount = userAuctionLanceRepository.FindAllUserAuctionLances()
                                                  .Where(u => u.UserId == user.UserId && u.AccountableForShopDiscount == true);

var discount = potentialDiscount.Where(p => p.DateTimeOfLance is within 30 days of today?)

How can I write this small query?

Answer 1

Define:

DateTime today = DateTime.Today;

and then use the lambda expression

p => p.DateTimeOfLance >= today.AddDays(-30) &&
     p.DateTimeOfLance <= today.AddDays(30)

EF might need you to do the following, though:

DateTime today = DateTime.Today;
DateTime thirtyDaysAgo = today.AddDays(-30);
DateTime thirtyDaysFromNow = today.AddDays(30);


p => p.DateTimeOfLance >= thirtyDaysAgo &&
     p.DateTimeOfLance <= thirtyDaysFromNow