Question

This query will only return all records where Active=true and Exempt=false. It should be returning any records also where Active=true and Exempt IS NULL. I guess the .IsNotEqualTo doesn’t compare to any records with a null value? Is there a way around this without setting a default?

UserCollection ActiveUsersNotExempt = new UserCollection();
ActiveUsersNotExempt = DB.Select().From<User>()
                .Where(User.Columns.Active).IsEqualTo(true)
                .And(User.Columns.Exempt).IsNotEqualTo(true)
                .ExecuteAsCollection<UserCollection>();`

Answer 1

Use AndExpression as follows to get a nested constraint (Exempt is not true or is null):

UserCollection ActiveUsersNotExempt = DB.Select().From<User>()
  .Where(User.Columns.Active).IsEqualTo(true)
  .AndExpression(User.Columns.Exempt).IsNotEqualTo(true)
  .Or(User.Columns.Exempt).IsNull()
  .ExecuteAsCollection<UserCollection>();`