System.ObjectModel by Microsoft

<PackageReference Include="System.ObjectModel" Version="4.0.11-beta-23409" />

.NET API 49,872 bytes

 NotifyCollectionChangedEventHandler

public sealed delegate NotifyCollectionChangedEventHandler : MulticastDelegate
Represents the method that handles the CollectionChanged event.
public NotifyCollectionChangedEventHandler(object object, IntPtr method)

public virtual IAsyncResult BeginInvoke(object sender, NotifyCollectionChangedEventArgs e, AsyncCallback callback, object object)

public virtual void EndInvoke(IAsyncResult result)

public virtual void Invoke(object sender, NotifyCollectionChangedEventArgs e)