This type of CollectionView does not support changes to its SourceCollection from a thread different from the Dispatcher thread [duplicate]

by

Since your ObservableCollection is created on UI thread, you can only modify it from UI thread and not from other threads. This is termed as thread affinity.

If you ever need to update objects created on UI thread from different thread, simply put the delegate on UI Dispatcher and that will do work for you delegating it to UI thread. This will work –

    public void Load()
    {
        matchList = new List<GetMatchDetailsDC>();
        matchList = proxy.GetMatch().ToList();

        foreach (EfesBet.DataContract.GetMatchDetailsDC match in matchList)
        {
            App.Current.Dispatcher.Invoke((Action)delegate // <--- HERE
            {
                _matchObsCollection.Add(match);
            });
        }
    }

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