Classes

• Enumerable static Provides a set of static (Shared in Visual Basic) methods for querying objects that implement IEnumerable`1.
• Grouping`2
• Lookup`2 Represents a collection of keys each mapped to one or more values.

Interfaces

• IGrouping`2 Represents a collection of objects that have a common key.
• ILookup`2 Defines an indexer, size property, and Boolean search method for data structures that map keys to IEnumerable`1 sequences of values.
• IOrderedEnumerable`1 Represents a sorted sequence.

Assemblies

• netstandard / View namespace in assembly
• System.Collections.Immutable / View namespace in assembly
• System.Linq / View namespace in assembly
• System.Linq.Expressions / View namespace in assembly
• System.Linq.Parallel / View namespace in assembly
• System.Linq.Queryable / View namespace in assembly