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POConversion from ReadOnlyObservableCollection to List<MyClass>
 

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    <p>I have a datagrid with grouping and I am trying to style the template to add in some summary about the group. </p> <p><strong>IN XAML DataGrid.RowGroupHeaderStyle</strong></p> <pre><code> &lt;Grid Grid.Column="3" Grid.Row="1" VerticalAlignment="Center" HorizontalAlignment="Stretch" Margin="0,1,0,1" &gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="200"/&gt; &lt;ColumnDefinition Width="*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Column="0" Text="{Binding Name}" Margin="4,0,0,0" /&gt; &lt;TextBlock Grid.Column="1" Text="{Binding Items, Converter="{StaticResource summaryConverter}"}" /&gt; &lt;/Grid&gt; </code></pre> <p><strong>Binding of data grid items source</strong> </p> <pre><code> PagedCollectionView collection = new PagedCollectionView(e.Result.ToList&lt;MyClass&gt;()); collection.GroupDescriptions.Add(new PropertyGroupDescription("Name")); dataGrid.ItemsSource = collection; </code></pre> <p><strong>MyClass</strong></p> <pre><code> class MyClass { public string Name; public double Value; } </code></pre> <p>I have created a converter to grab the Items of the same group but I am facing problem in converting the object into <code>List&lt;MyClass&gt;()</code>. I receive this error</p> <blockquote> <p>Unable to cast object of type 'System.Collections.ObjectModel.ReadOnlyObservableCollection<code>1[System.Object]' to type 'System.Collections.Generic.List</code>1[MyClass]'. `</p> </blockquote> <p><strong>In Converter.cs</strong></p> <pre><code> public object Convert(object values, Type targetType, object param, CultureInfo culture) { var source = (List&lt;MyClass&gt;)values; } </code></pre> <p>Does anyone know how should I do the conversion??</p>
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    1. COWhy do you need a List?
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      1. USShawn Kendrot
    2. COBecause the item source is a list of MyClass and I would like to do the summation of the property `Value` inside the list
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      1. POConversion from ReadOnlyObservableCollection to List<MyClass>
      1. USnoobie
 

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