Question

Anyone know how to query for a specific date within entity framework ? I tried following code, but it gives me NotSupportedException.

var deposit = (from tempDeposit in entities.Deposit where !tempDeposit.IsApproved && tempDeposit.CreatedDate.Date == DateTime.Today select tempDeposit).FirstOrDefault(); 

I also tried following code but still gave me NotSupportedException.

var deposit = (from tempDeposit in entities.Deposit where !tempDeposit.IsApproved && tempDeposit.CreatedDate.ToFullString() == DateTime.Today.ToFullString() select tempDeposit).FirstOrDefault(); 

ToFullString() is an extension method

public static string ToFullString(this DateTime date){   return date.ToString('yyyyMMdd'); } 

Please help.

Answer 1

Try this:

var d1 = DateTime.Today; var d2 = d1.AddDays(1); var deposit = (from tempDeposit in entities.Deposit                where !tempDeposit.IsApproved                      && tempDeposit.CreatedDate >= d1                      && tempDeposit.CreatedDate < d2                select tempDeposit).FirstOrDefault(); 

Since you can’t use the .Date property of a DateTime column, since that would have to be written in SQL with a range of converts, casts, truncates, etc. then you need to compare the whole DateTime value, date and time both, to a value, and thus you need to compare to a range.

Edit Changed to reflect that .AddDays isn’t supported.