linq - Using "Any" or "Contains" when context not saved yet

Question

Why isn't the exception triggered? Linq's "Any()" is not considering the new entries?

MyContext db = new MyContext();

foreach (string email in {"asdf@gmail.com", "asdf@gmail.com"})
{
   Person person = new Person();
   person.Email = email;

   if (db.Persons.Any(p => p.Email.Equals(email))
   {
       throw new Exception("Email already used!");
   }

   db.Persons.Add(person);
}

db.SaveChanges()

Shouldn't the exception be triggered on the second iteration?

The previous code is adapted for the question, but the real scenario is the following:
I receive an excel of persons and I iterate over it adding every row as a person to db.Persons, checking their emails aren't already used in the db. The problem is when there are repeated emails in the worksheet itself (two rows with the same email)

Answer 1

への呼び出しdb.Personsは常にデータベース クエリをトリガーしますが、それらの新しい Person はまだデータベースに永続化されていません。