Custom collections - how do I enable the default property to be invoked using an index or a string?

Hi Experts,

You know collections that can be referenced by using either of the following syntax;

foo = myObject("itemID").value


foo = myObject(0).value

How do you do this?

At the moment I'm using the line;

Inherits ArrayList

to allow me to use the .Add(object) function and give me an enumeratable (is that a word?) object.
LVL 10
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.

What you'd like to create is called an "indexer". You could use syntax like this to define one:

      Default Public Property Item(ByVal Index As Int32) As MyClass
                  Return something
            End Get
      End Property

      Default Public Property Item(ByVal Key As String) As MyClass
                  Return something
            End Get
      End Property

This article gives a more detailed code sample:

The "Item" property is what does the trick here. Documentation for


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
thefritterfatboyAuthor Commented:
Spot on, thank you!
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

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.