NHibernateQuery

ex1.cs

interface IQuery<TCriteria, TResult> { TResult Execute(TCriteria criteria); }

class BooksWithISBN { public string ISBN { get; set; } }

class BooksWithISBNQuery : IQuery<BooksWithISBN, IEnumerable<Book>> {
  public IEnumerable<Book> Execute(BooksWithISBN criteria) {
    return session.Query<Book>().Where(b => b.ISBN == criteria.ISBN).AsEnumerable();
  }
}

ex2.cs

interface IQuery<TResult>

interface IBooksWithISBN : IQuery<TResult> { string ISBN { get; set; } }

class BooksWithISBNQuery : IBooksWithISBN { 
  public string ISBN { get; set; } 
  
  public IEnumerable<Book> Execute() {
    return session.Query<Book>().Where(b => b.ISBN == ISBN).AsEnumerable();
  }
}