| AvaloniaResourcesEntry | |
| AvaloniaResourcesIndexEntry | |
| AvaloniaResourcesIndexReaderWriter | |
| IdentifierParser | |
| KeywordParser | |
| MathUtilities | Provides math utilities not provided in System.Math. |
| SpanHelpers | |
| StyleClassParser | |
| SynchronousCompletionAsyncResultSourceT | Source for incomplete SynchronousCompletionAsyncResult |
| TargetWeakEventSubscriberTTarget, TEventArgs | |
| TypeUtilities | Provides utilities for working with types at runtime. |
| WeakEvent | |
| WeakEventTSender, TEventArgs | Manages subscriptions to events using weak listeners. |
| WeakEventHandlerManager | Manages subscriptions to events using weak listeners. |
| WeakEvents | |
| WeakEventSubscriberTEventArgs |
| CharacterReader | |
| ImmutableReadOnlyListStructEnumeratorT | |
| StringTokenizer | Obsolete. |
| SynchronousCompletionAsyncResultT | A task-like operation that is guaranteed to finish continuations synchronously, can be used for parametrized one-shot events |
| ValueSpanT | Pairing of value and positions sharing that value. |
| IWeakEventSubscriberTEventArgs | Defines a listener to a event subscribed vis the WeakEventTSender, TEventArgs. |