Simple way to compare Dates in DateTime attribute using Entity Framework 4 and Linq queries

Question

I\'m trying to run the following bit of code, but the comparison fails by not handing my the entities I expect it to.

It\'s comparing 06/09/2011 0:00:00

Answer 1

You could convert using

DateTime.ToShortDateString()

http://msdn.microsoft.com/en-us/library/system.datetime.toshortdatestring.aspx

This would neglect the Time.

Then compare the two Strings.

if(string1 == string2)
{
 //Do Something
}

Answer 2

try

DateTime todayStart = DateTime.Now.Date;
DateTime todayEnd = DateTime.Now;
var newAuctionsResults = repo.FindAllAuctions()
                        .Where(a => a.IsActive == true || (a.StartTime.Value >= todayStart && a.StartTime.Value <= todayEnd))
                        .ToList();

Answer 3

You can use the individual members:

var newAuctionsResults = repo.FindAllAuctions()
                        .Where(a => a.IsActive == true 
                                    || (a.StartTime.Value.Year == todayYear
                                        && a.StartTime.Value.Month == todayMonth
                                        && a.StartTime.Value.Day == todayDay))
                        .ToList();

...or use any of the other methods/properties supported in L2E.

Answer 4

You can also use EntityFunctions.TruncateTime() under the namespace System.Data.Objects

Ex.

db.Orders.Where(i => EntityFunctions.TruncateTime(i.OrderFinishDate) == EntityFunctions.TruncateTime(dtBillDate) && i.Status == "B")

Works like charm.