Question

I am trying to find a single statement that will work for the query below.
I can query for nulls or integer values but not both with the same code.

  int? age = null;

  Student student;

  age = 12;

  //works
  student = entities.Students.Single(s => s.Age == age);

  //does not work - crash
  student = entities.Students.Single(s => s.Age.Equals(age));

  age = null;
  //works
  student = entities.Students.Single(s => s.Age.Equals(age));

Note in response to the first answer:

//crashes with error - sequence contains no elements
age = null;
student = entities.Students.Single(s => s.Age == age);

Answer 1

Unfortunately this is well known and reported issue. The workaround is:

student = entities.Students.Single(s => age == null ? s.Age == null : s.Age == age);