GetNotificationSubjectFuncAsyncTNotification, TNotificationData - делегат

Public Delegate Function GetNotificationSubjectFuncAsync(Of In TNotification As INotification, In TNotificationData As {Object, INotificationData(Of TNotification)}) ( 
	context As INotificationContext,
	notification As TNotification,
	data As TNotificationData,
	Optional cancellationToken As CancellationToken = Nothing
) As ValueTask(Of String)

generic<typename TNotification, typename TNotificationData>
where TNotification : INotification
where TNotificationData : Object, INotificationData<TNotification>
public delegate ValueTask<String^> GetNotificationSubjectFuncAsync(
	INotificationContext^ context, 
	TNotification notification, 
	TNotificationData data, 
	CancellationToken cancellationToken = CancellationToken()
)

type GetNotificationSubjectFuncAsync = 
    delegate of 
        context : INotificationContext * 
        notification : 'TNotification * 
        data : 'TNotificationData * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> ValueTask<string>