Freely convert between List and IEnumerable

Question

How can I convert a List to an IEnumerable and then back again?

I want to do this in order to run a series

Answer 1

Converting List to IEnumerable

List implements IEnumerable (and many other such as IList, ICollection) therefore there is no need to convert a List back to IEnumerable since it already a IEnumerable.

Example:

public class Person
{
    public int Id { get; set; }
    public string Name { get; set; }
}

Person person1 = new Person() { Id = 1, Name = "Person 1" };
Person person2 = new Person() { Id = 2, Name = "Person 2" };
Person person3 = new Person() { Id = 3, Name = "Person 3" };

List people = new List() { person1, person2, person3 };

//Converting to an IEnumerable
IEnumerable IEnumerableList = people;

You can also use Enumerable.AsEnumerable() method

IEnumerable iPersonList = people.AsEnumerable();

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Converting IEnumerable to List

IEnumerable OriginallyIEnumerable = new List() { person1, person2 };
List convertToList = OriginallyIEnumerable.ToList();

This is useful in Entity Framework.