TopicControlViewModel - конструктор

public TopicControlViewModel(
	ForumViewModel forumViewModel,
	TopicModel topicModel,
	Guid? messageID = null,
	DateTime? openMessageTime = null,
	Func<MessageModel, ParticipantModel, bool> isVisibleEditAction = null
)

Public Sub New ( 
	forumViewModel As ForumViewModel,
	topicModel As TopicModel,
	Optional messageID As Guid? = Nothing,
	Optional openMessageTime As DateTime? = Nothing,
	Optional isVisibleEditAction As Func(Of MessageModel, ParticipantModel, Boolean) = Nothing
)

public:
TopicControlViewModel(
	ForumViewModel^ forumViewModel, 
	TopicModel^ topicModel, 
	Nullable<Guid> messageID = nullptr, 
	Nullable<DateTime> openMessageTime = nullptr, 
	Func<MessageModel^, ParticipantModel^, bool>^ isVisibleEditAction = nullptr
)

new : 
        forumViewModel : ForumViewModel * 
        topicModel : TopicModel * 
        ?messageID : Nullable<Guid> * 
        ?openMessageTime : Nullable<DateTime> * 
        ?isVisibleEditAction : Func<MessageModel, ParticipantModel, bool> 
(* Defaults:
        let _messageID = defaultArg messageID null
        let _openMessageTime = defaultArg openMessageTime null
        let _isVisibleEditAction = defaultArg isVisibleEditAction null
*)
-> TopicControlViewModel