Best way to add an array of objects to a list of extended objects

Question

I have an Array Customers[] named 'customerArray' and I have a Generic List List<ExtendedCustomers> named 'extendedCustomerList'

The ExtendedCustomer class contains some properties, and one of them is 'Customer' (Yes, thats the same as the objects in the array), like this:

public class ExtendedCustomer {
     public Customer { get; set; }
     public OtherProperty { get; set; }
     ....
}

What is the fastest / best / easiest / best performing / most beautiful way to add the array with Customers to the list with ExtendedCustomers? The other properties in ExtendedCustomer can keep ther default NULL value.

_{I don't like loops}

Answer 1

You can use AddRange() with a projection from customers to extended customers:

extendedCustomerList.AddRange(customerArray.Select(
    c => new ExtendedCustomer() {
        Customer = c
    }));

Answer 2

Customer[] customers = ...;
List<ExtendedCustomer> extendedCustomers = ...;
extendedCustomers.AddRange(
       customers.Select(c => new ExtendedCustomer{ Customer = c }));

Answer 3

Using LINQ:

extendedCustomerList.AddRange(
    from customer in customerArray
    select new ExtendedCustomer {
        Customer = customer
    }
);