如何从 C# 中的另一个类创建对象的 ArrayList

Question

I am trying to create an ArrayList of instances from another class in my program. In my case the class I am trying to create an ArrayList of is called record with the parameters firstname, lastname, and email. I have created another class called emailList and I am trying to instantiate the array list there. I am getting the error "The non-generic type 'ArrayList' cannot be used with type arguments".

Here is the code I have to create record objects in the Record class:

public class Record
    {
        private String firstname;
        private String lastname;
        private String email;
        public Record(String firstNameIn, String lastNameIn, String emailIn)
        {
            firstname = firstNameIn;
            lastname = lastNameIn;
            email = emailIn;
        }

In the emailList class I am trying to create an ArrayList in the emailList class using:

ArrayList<Record> eList = new ArrayList<Record>;

Answer 1

ArrayList is not generic meaning you cannot provide an generic argument (eg: ArrayList<Record> ), you need to instantiate it as var eList = new ArrayList();

For type-safe collection check List<T> under System.Collections.Generic namespace.

Answer 2

You don't need a type specifier for ArrayList :

ArrayList eList = new ArrayList();
eList.Add(new Record("Test", "Test", "test@test.com"));