LINQ to Entities nicht erkennt die Methode 'System.String ToString ()' - Methode

string[] userIds = userList.Split(','); //is an array of integers
IList<User> users = (from user in this.repository.Users
                     where userIds.Contains(user.Id.ToString())
                     select user).ToList();

obige Abfrage gibt

System.NotSupportedException: LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression

Was kann ich tun?

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