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POWPF Multiple CollectionView with different filters on same collection
 

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    <p>I'm using a an <code>ObservableCollection</code> with two <code>ICollectionView</code> for different filters.</p> <p>One is for filtering messages by some type, and one is for counting checked messages. As you can see message filter and message count works OK, but when I'm un-checking the message disappear from the list (<em>the count is still working</em>).</p> <p>BTW sorry for the long post, I wanted to include all relevant stuff.</p> <p><strong>The XAML Code:</strong></p> <pre><code>&lt;!-- Messages List --&gt; &lt;DockPanel Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="3" Height="500"&gt; &lt;ListBox Name="listBoxZone" ItemsSource="{Binding filteredMessageList}" Background="Transparent" BorderThickness="0"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;CheckBox Name="CheckBoxZone" Content="{Binding text}" Tag="{Binding id}" Unchecked="CheckBoxZone_Unchecked" Foreground="WhiteSmoke" Margin="0,5,0,0" IsChecked="{Binding isChecked}" /&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/DockPanel&gt; &lt;Button Content="Test Add New" Grid.Column="2" Height="25" HorizontalAlignment="Left" Margin="34,2,0,0" Click="button1_Click" /&gt; &lt;Label Content="{Binding checkedMessageList.Count}" Grid.Column="2" Height="25" Margin="147,2,373,0" Width="20" Foreground="white" /&gt; </code></pre> <p><strong>Screenshot:</strong> <img src="https://i.stack.imgur.com/cVYM6.gif" alt="enter image description here"></p> <p><strong>Code:</strong></p> <pre><code>/* ViewModel Class */ public class MainViewModel : INotifyPropertyChanged { // Constructor public MainViewModel() { #region filteredMessageList // connect the ObservableCollection to CollectionView _filteredMessageList = CollectionViewSource.GetDefaultView(messageList); // set filter _filteredMessageList.Filter = delegate(object item) { MessageClass temp = item as MessageClass; if ( selectedFilter.Equals(AvailableFilters.All) ) { return true; } else { return temp.filter.Equals(_selectedFilter); } }; #endregion #region checkedMessageList // connect the ObservableCollection to CollectionView _checkedMessageList = CollectionViewSource.GetDefaultView(messageList); // set filter _checkedMessageList.Filter = delegate(object item) { return (item as MessageClass).isChecked; }; #endregion } // message List private ObservableCollection&lt;MessageClass&gt; _messageList = new ObservableCollection&lt;MessageClass&gt;(); public ObservableCollection&lt;MessageClass&gt; messageList { get { return _messageList; } set { _messageList = value; } } // CollectionView (filtered messageList) private ICollectionView _filteredMessageList; public ICollectionView filteredMessageList { get { return _filteredMessageList; } } // CollectionView (filtered messageList) private ICollectionView _checkedMessageList; public ICollectionView checkedMessageList { get { return _checkedMessageList; } } // SelectedFilter property private AvailableFilters _selectedFilter = AvailableFilters.All; // Default is set to all public AvailableFilters selectedFilter { get { return _selectedFilter; } set { _selectedFilter = value; RaisePropertyChanged("selectedFilter"); _filteredMessageList.Refresh(); // refresh list upon update } } // FilterList (Convert Enum To Collection) private List&lt;KeyValuePair&lt;string, AvailableFilters&gt;&gt; _AvailableFiltersList; public List&lt;KeyValuePair&lt;string, AvailableFilters&gt;&gt; AvailableFiltersList { get { /* Check if such list available, if not create for first use */ if (_AvailableFiltersList == null) { _AvailableFiltersList = new List&lt;KeyValuePair&lt;string, AvailableFilters&gt;&gt;(); foreach (AvailableFilters filter in Enum.GetValues(typeof(AvailableFilters))) { string Description; FieldInfo fieldInfo = filter.GetType().GetField(filter.ToString()); DescriptionAttribute[] attributes = (DescriptionAttribute[])fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false); /* if not null get description */ if (attributes != null &amp;&amp; attributes.Length &gt; 0) { Description = attributes[0].Description; } else { Description = string.Empty; } /* add as new item to filterList */ KeyValuePair&lt;string, AvailableFilters&gt; TypeKeyValue = new KeyValuePair&lt;string, AvailableFilters&gt;(Description, filter); _AvailableFiltersList.Add(TypeKeyValue); } } return _AvailableFiltersList; } } #region Implement INotifyPropertyChanged public event PropertyChangedEventHandler PropertyChanged; public void RaisePropertyChanged(string propertyName) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName)); } #endregion } </code></pre> <p><strong>Code For un-check function</strong></p> <pre><code>private void CheckBoxZone_Unchecked(object sender, RoutedEventArgs e) { CheckBox chkZone = (CheckBox)sender; ucSystemMessageVM.checkedMessageList.Refresh(); } </code></pre>
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    1. CODave this is not so much an answer but may help you down the road. Recently doing some WPF contract work I just couldn't find the right solution for filter,paging,sorting as I wanted it. I built this generic class. Thought you might like to poke around in it. http://www.origin1.com/downloads/PagedObservableCollection.txt. obviously change the ext.
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