System.Collections.HashMap.KeysCollection.GetEnumerator C# (CSharp) Method

            public virtual IEnumerator GetEnumerator() {
                IEnumerator e = keys.GetEnumerator();
                if (m.hasNullKey) {
                    return new HashMapEnumerator(e, m.valueOfNullKey, 1);
                }
                else {
                    return e;
                }
            }
            public virtual int Count {