public static class RankByExtension<ExtensionAttribute>
Public NotInheritable Class RankByExtension[ExtensionAttribute]
public ref class RankByExtension abstract sealed[<AbstractClassAttribute>]
[<SealedAttribute>]
[<ExtensionAttribute>]
type RankByExtension = class end| RankByTSource, TKey(IEnumerableTSource, FuncTSource, TKey) | Ranks each item in the sequence in descending ordering by a specified key using a default comparer | 
| RankByTSource, TKey(IEnumerableTSource, FuncTSource, TKey, IComparerTKey) | Ranks each item in a sequence using a specified key and a caller-supplied comparer |