static void Main(string[] args)
        {
            Test<Users> ut = new Test<Users>();
            var q = ut.Find1(x => x.id == 1);
            var v = ut.Find2(x => x.id == 1);
 
 
            Console.ReadKey();
        }
 
        public class Test<T> where T:class
        {
            // EF
            Entities dbEF = new Entities();
            public virtual T Find1(Expression<Func<T, bool>> where1)
            {
                T _entity = dbEF.Set<T>().FirstOrDefault<T>(where1);
                return _entity;
            }
 
            public virtual T Find2(Func<T, bool> where2)
            {
                T _entity = dbEF.Set<T>().FirstOrDefault<T>(where2);
                return _entity;
            }
        }