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

System.ComponentModel.AsyncCompletedEventHandler

Represents the method that will handle the MethodNameCompleted event of an asynchronous operation.
public AsyncCompletedEventHandler(object object, IntPtr method)

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

public virtual void EndInvoke(IAsyncResult result)

public virtual void Invoke(object sender, AsyncCompletedEventArgs e)