Returns an enumerator object that lets you access each key in the dictionary.
Original signature is '- (NSEnumerator *)keyEnumerator'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |
public virtual NSEnumerator KeyEnumerator { get; }
Public Overridable ReadOnly Property KeyEnumerator As NSEnumerator Get
public: virtual property NSEnumerator^ KeyEnumerator { NSEnumerator^ get (); }

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)