How to handle C # WPF stream in MVVM model

Question

I have a bear of time figuring out how to handle Thread from a class outside my ViewModel.

A topic comes from a class Track. Here is the code ResponseEventHandlerin Track:

public delegate void ResponseEventHandler(AbstractResponse response);
public event ResponseEventHandler OnResponseEvent;

When the command method is processed from my object Track, the following code runs OnResponseEvent, which sends a message to Thread back to my ViewModel:

if (OnResponseEvent != null)
{
    OnResponseEvent(GetResponseFromCurrentBuffer());
}

GetResponseFromCurrentBuffer()just returns the message type, which is the predefined type in Track.

My constructor MainWindowViewModelcreates an event handler for OnResponseEventfrom Track:

public MainWindowViewModel()
{
    Track _Track = new Track();

    _Track.OnResponseEvent +=
        new Track.ResponseEventHandler(UpdateTrackResponseWindow);
}

, , , OnResponseEvent, UpdateTrackResponseWindow(). ObservableCollection<string>, TrackResponseMessage:

private void UpdateTrackResponseWindow(AbstractResponse message)
{
    TrackResponseMessage.Add(FormatMessageResponseToString(message));
}

FormatMessageResponseToString() Track .

: , TrackResponseMessage.Add() . , - Visual Studio 2010.

TrackResponseMessage ViewModel:

public ObservableCollection<String> TrackResponseMessage
{
    get { return _trackResponseMessage; }
    set
    {
        _trackResponseMessage = value;
        RaisePropertyChanged("TrackResponseMessage");
    }
}

Thread, Track, ViewModel? !

Answer 1

, Track.cs, ? !

. , INotifyPropertyChanged , INotifyCollectionChanged (..: ObservableCollection<T>). , .

(View-First MVVM) , , , .NET 4:

TaskScheduler uiScheduler;
public MainWindowViewModel() 
{
    uiScheduler = TaskScheduler.FromCurrentSynchronizationContext();
    Track _Track = new Track();
    _Track.OnResponseEvent += new Track.ResponseEventHandler(UpdateTrackResponseWindow);
}

, , :

private void UpdateTrackResponseWindow(AbstractResponse message) 
{
    Task.Factory.StartNew(
       () => TrackResponseMessage.Add(FormatMessageResponseToString(message)),
       CancellationToken.None, TaskCreationOptions.None,
       uiScheduler); 
}

: WPF Silverlight ViewModel (..: Dispatcher), . (.. WCF).

Answer 2

RaisePropertychanged , , .