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There is no DataContextChanging event, but the DataContextChanged event provides the old value of the DataContext :

private void Window_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
    object oldDataContext = e.OldValue;
                The delegate is a bit different for windows runtime. The args is DataContextChangedEventArgs , and it doesn't have an oldValue property. What would be the equievalent ?
– bahti
                Feb 23, 2016 at 13:01
        
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