How do you compare a nullable int to an int

Question

In my Linq query I have the following :

.Where(x => x.dtt_ref_no == dtt_ref)

where x.dtt_ref_no is a nullable int
and dtt_ref is of type int.
What is the correct way to compare these two values?

Answer 1

Your code works as it is, if you use == on a int? and an int it will return false if the nullable doesn't contain a value. So it's the same as if you'd write:

.Where(x => x.dtt_ref_no.HasValue &&  x.dtt_ref_no.Value == dtt_ref)

It's the same behaviour as Nullable<T>.Equals because the int will be converted to an int? implicitly on comparison.