VB6 to C#: IUnknown

Question

I have a property in VB6 that I am trying to convert to C#. It is as follows:

Public Property Get NewEnum() As IUnknown
    'this property allows you to enumerate
    'this collection with the For...Each syntax
    Set NewEnum = m_coll.[_NewEnum]
End Property

m_coll is private variable that is now an ArrayList instead of the former Collection.

m_collis being populated with one of my own class objects. This property is of the type IUnknown as you can see.

I may just not be thinking properly at this point, but is there an equivalent to this sort of property in C#?

Are you thinking of IEnumerable? That allows you to use a foreach statement on a collection. — Jason Down, Apr 09 '13 at 20:04
You should not be using `ArrayList`. Use the generic `List` instead. — Servy, Apr 09 '13 at 20:05

NDJ · Accepted Answer · 2013-04-09T20:40:36.313

2

If you want to be able to do a foreach over a class (like you could by exposing NewEnum() as IUnknown in vb6) you can have your class implement IEnumerable - e.g.:

   public class MyClass : IEnumerable 
    {
        private List<string> items = new List<string>();

        public MyClass()
        {
            items.Add("first");
            items.Add("second");
        }


        public IEnumerator GetEnumerator()
        {
            return items.GetEnumerator();
        }
    }

which would allow you to use it like this:

  MyClass myClass =new MyClass();
            foreach (var itm in myClass)
            {
                Console.WriteLine(itm);
            }

I've used List<string> for simplicity, but you can use List<yourCustomClass>

edited Apr 09 '13 at 20:40

answered Apr 09 '13 at 20:30

NDJ

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You answered after I already figured it out, but I will still give you the point ;) Thanks! – Logan B. Lehman Apr 09 '13 at 20:52
Thanks! Sorry I wasn't quicker :) – NDJ Apr 09 '13 at 20:53

VB6 to C#: IUnknown

1 Answers1