public static class IndexExtension<ExtensionAttribute>
Public NotInheritable Class IndexExtension[ExtensionAttribute]
public ref class IndexExtension abstract sealed[<AbstractClassAttribute>]
[<SealedAttribute>]
[<ExtensionAttribute>]
type IndexExtension = class end| IndexTSource(IEnumerableTSource) | Returns a sequence of KeyValuePairTKey, TValue where the key is the zero-based index of the value in the source sequence. | 
| IndexTSource(IEnumerableTSource, Int32) | Returns a sequence of KeyValuePairTKey, TValue where the key is the index of the value in the source sequence. An additional parameter specifies the starting index. |