Classes

• KeyNotFoundException The exception that is thrown when the key specified for accessing an element in a collection does not match any key in the collection.
• KeyValuePair static

Structures

• KeyValuePair`2 Defines a key/value pair that can be set or retrieved.

Interfaces

• IAsyncEnumerable`1 Exposes an enumerator that provides asynchronous iteration over values of a specified type.
• IAsyncEnumerator`1 Supports a simple asynchronous iteration over a generic collection.
• ICollection`1 Defines methods to manipulate generic collections.
• IComparer`1 Defines a method that a type implements to compare two objects.
• IDictionary`2 Represents a generic collection of key/value pairs.
• IEnumerable`1 Exposes the enumerator, which supports a simple iteration over a collection of a specified type.
• IEnumerator`1 Supports a simple iteration over a generic collection.
• IEqualityComparer`1 Defines methods to support the comparison of objects for equality.
• IList`1 Represents a collection of objects that can be individually accessed by index.
• IReadOnlyCollection`1 Represents a strongly-typed, read-only collection of elements.
• IReadOnlyDictionary`2 Represents a generic read-only collection of key/value pairs.
• IReadOnlyList`1 Represents a read-only collection of elements that can be accessed by index.
• ISet`1 Provides the base interface for the abstraction of sets.

Assemblies

• netstandard / View namespace in assembly
• System.Collections / View namespace in assembly
• System.Private.CoreLib / View namespace in assembly
• System.Runtime / View namespace in assembly