public static IEnumerable<KeyValuePair<int, TSource>> Index<TSource>(
	this IEnumerable<TSource> source
)

<ExtensionAttribute> _
Public Shared Function Index(Of TSource) ( _
	source As IEnumerable(Of TSource) _
) As IEnumerable(Of KeyValuePair(Of Integer, TSource))

public:
[ExtensionAttribute]
generic<typename TSource>
static IEnumerable<KeyValuePair<int, TSource>>^ Index(
	IEnumerable<TSource>^ source
)