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<h2>Introduction</h2> <p>Basically, if there is a need to display a sorted collection, please consider using the <code>CollectionViewSource</code> class: assign ("bind") its <code>Source</code> property to the source collection — an instance of the <code>ObservableCollection<T></code> class.</p> <p>The idea is that <a href="http://msdn.microsoft.com/en-us/library/system.windows.data.collectionviewsource.getdefaultview%28v=vs.110%29.aspx" rel="nofollow noreferrer"><code>CollectionViewSource</code> class provides an instance of the <code>CollectionView</code> class</a>. This is kind of "projection" of the original (source) collection, but with applied sorting, filtering, etc.</p> <p>References:</p> <ul> <li><a href="https://docs.microsoft.com/en-us/dotnet/framework/wpf/data/how-to-sort-and-group-data-using-a-view-in-xaml" rel="nofollow noreferrer">How to: Sort and Group Data Using a View in XAML</a>.</li> <li><a href="http://www.zagstudio.com/blog/387#" rel="nofollow noreferrer">WPF’s CollectionViewSource</a>.</li> </ul> <h3>Live Shaping</h3> <p>WPF 4.5 introduces "Live Shaping" feature for <code>CollectionViewSource</code>.</p> <p>References:</p> <ul> <li><a href="http://blogs.microsoft.co.il/pavely/2011/10/02/wpf-45-new-feature-live-shaping/" rel="nofollow noreferrer">WPF 4.5 New Feature: Live Shaping</a>.</li> <li><a href="https://docs.microsoft.com/en-us/dotnet/api/system.windows.data.collectionviewsource.islivesorting" rel="nofollow noreferrer">CollectionViewSource.IsLiveSorting Property</a>.</li> <li><a href="http://msdn.microsoft.com/en-us/library/bb613588%28v=vs.110%29.aspx#live_shaping" rel="nofollow noreferrer">Repositioning data as the data's values change (Live shaping)</a>.</li> </ul> <h2>Solution</h2> <p>If there still a need to sort an instance of the <code>ObservableCollection<T></code> class, here is how it can be done. The <code>ObservableCollection<T></code> class itself does not have sort method. But, the collection could be re-created to have items sorted:</p> <pre><code>// Animals property setter must raise "property changed" event to notify binding clients. // See INotifyPropertyChanged interface for details. Animals = new ObservableCollection<string> { "Cat", "Dog", "Bear", "Lion", "Mouse", "Horse", "Rat", "Elephant", "Kangaroo", "Lizard", "Snake", "Frog", "Fish", "Butterfly", "Human", "Cow", "Bumble Bee" }; ... Animals = new ObservableCollection<string>(Animals.OrderBy(i => i)); </code></pre> <h2>Additional details</h2> <p>Please note that <code>OrderBy()</code> and <code>OrderByDescending()</code> methods (as other LINQ–extension methods) <strong>do not modify</strong> the source collection! They instead <strong>create a new sequence</strong> (i.e. a new instance of the class that implements <code>IEnumerable<T></code> interface). Thus, it is necessary to re-create the collection.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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