"Internal implementation package not meant for direct consumption.  Please do not reference directly. Provides classes that define generic collections, which allow developers to create strongly typed collections that provide better type safety and performance than non-generic strongly typed collections.Commonly Used Types:System.Collections.Generic.List<T>System.Collections.Generic.Dictionary<TKey, TValue>System.Collections.Generic.Queue<T>System.Collections.Generic.Stack<T>System.Collections.Generic.HashSet<T>System.Collections.Generic.LinkedList<T>System.Collections.Generic.EqualityComparer<T>System.Collections.Generic.Comparer<T>System.Collections.Generic.SortedDictionary<TKey, TValue> When using NuGet 3.x this package requires at least version 3.4."