How do I implement IEnumerable in my Dictionary wrapper class that implements IEnumerable?

Question

I\'m trying to create a wrapper for a Dictionary.

Dictionary implements IEnumerable

Answer 1

When implementing IEnumerable, you must also explicitly implement IEnumerable.GetEnumerator(). The method for the generic interface is not valid in and of itself as an implementation for the non-generic method contract. You can have one call the other, or since you have a child object whose enumerator you are using, just copy/paste;

using System.Collections;
using System.Collections.Generic;

public class FooCollection : IEnumerable
{
    private Dictionary fooDictionary = new Dictionary();

    public IEnumerator GetEnumerator()
    {
        return fooDictionary.Values.GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        //forces use of the non-generic implementation on the Values collection
        return ((IEnumerable)fooDictionary.Values).GetEnumerator();
    }

    // Other wrapper methods omitted

}