Dispatcher.CurrentDispatcher?

If I do this...

public PriorityQueue(Dispatcher dispatcher = null)
{
    this.dispatcher = dispatcher ?? Dispatcher.CurrentDispatcher;
}

And then use it in a ViewModel (without passing any args) that is created t开发者_Go百科hrough the XAML, this.dispatcher will point to the UI thread right?

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If it is created from within the UI thread (which it would be, if instantiated inside XAML), then yes, it will point to the UI thread's Dispatcher.