title: CollectionChanged and IList of Items - why the difficulties
body: <p>I am looking into the topic why a <code>ObservableCollection/ListCollectionView/CollectionView</code> raises a <strong>NotSuportedException</strong> when calling the CollectionChanged with the parameter of IList.</p>
  
  <pre><code>//Throws an exception
  private void collectionChanged_Removed(IList items)
  {
      if (CollectionChanged != null)
          CollectionChanged(this, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, items));
  }
  </code></pre>
  
  <p>I have found several Webpages, talking about this topic and they suggest either using the <code>Reset</code> ability to force a complete redraw of the UI, or just simply call for each item the <code>CollectionChanged</code> or some more creative way: <a href="http://geekswithblogs.net/NewThingsILearned/archive/2008/01/16/listcollectionviewcollectionview-doesnt-support-notifycollectionchanged-with-multiple-items.aspx" rel="noreferrer">http://geekswithblogs.net/NewThingsILearned/archive/2008/01/16/listcollectionviewcollectionview-doesnt-support-notifycollectionchanged-with-multiple-items.aspx</a></p>
  
  <p>I just cant find the WHY?
  For me it makes no sense why this would be the case.</p>
  
  <p>Is there any chance that this lacking feature, which we <strong>all</strong> face at some point in our Development Cycle, since the Add method just has to much of an overhead when you want to Add multiple items fast, will be implemented any time (.Net 5, C# 6...).</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>In my specific case, I have written my own class :</p>
  
  <pre><code>public class ObservableList&lt;T&gt; : IList&lt;T&gt;, IList, IEnumerable&lt;T&gt;,
      INotifyCollectionChanged
  {
      public event NotifyCollectionChangedEventHandler CollectionChanged;
      //other stuff...
  }
  </code></pre>
  
  <p>And still throws the said <strong>NotSupportedException</strong>.</p>