Seeking an explanation of how a "ReadOnlyCollection" works in this given case?

I'm trying to find out what is happening in the following lines and I'm new to the "ReadyOnlyCollection." I was hoping someone could explain it to me. I'm especially confused about the line:

_children = new ReadOnlyCollection<Node>(_intChildren);
public Node Parent { get; }
private List<Node> _intChildren;
private ReadOnlyCollection<Node> _children;
public ReadOnly Collection<Node> Children
{
   get 
   {
      if (_children == null)
         _children = new ReadOnlyCollection<Node>(_intChildren);
      return _children;
   }
}

Open in new window

EindoofusAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

käµfm³d 👽Commented:
A ReadOnlyCollection is just a wrapper around an existing collection. The thing that makes it "read only" is the fact that it does not expose an Add nor a Remove method. This, however, is just a facade, because if some piece of code already had access to the underlying list, then it could easily add to or remove from the collection.

This line:

_children = new ReadOnlyCollection<Node>(_intChildren);

Open in new window


is just initializing the private member variable _children with a new instance of a ReadOnlyCollection--one which wraps the private member variable _intChildren. Other parts of the class containing this code would be free to modify the underlying list (in this case:  _intChildren) since it is a member variable and thus scoped to the entire class. Outside code, however, cannot modify the list because it is private and the only public interaction with this list is by way of the Children property, which points to the ReadOnlyCollection wrapper.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
EindoofusAuthor Commented:
Thanks :)
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.