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PORefreshing UI with databind in WPF
 

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    <p>I have a 3 layer deep treeview,</p> <pre> -MAIN ->:SUB1 >:SUB2 >:SUB2 -X:SUB1 X:SUB2 SUB1 SUB1 </pre> <p>where, > and X represent graphics denoting the status of that specific item (determined from backend).</p> <p>I'm using an Observable Dictionary to bind to this tree (and it has an ICollectionChanged event). The structure is like this:</p> <pre> <code> ObservableDictionary&lt;string,CustomClass&gt; mainitems; public class CustomClass{ ObservableDictionary&lt;string, InnerClass&gt; sub1item; // Bunch of properties and methods in this class // INotify not implemented } public class InnerClass{ // Bunch of properties and methods in this class // INotify not implemented public SomeEnum Status{ get{ return this.status; } } } </code> </pre> <p>The graphics, mentioned above, are binded using a custom converter which converts the Status enum to a path so that it can be binded (ie. &lt;img source="{Binding Path=something, Converter={StaticResource someconverter}, Mode=OneWay" /&gt; ).</p> <p><strong>QUESTION:</strong></p> <p>My problem is, when I update the CustomClass's sub1item dictionary with new statuses, it doesn't update it in the UI. I think implementing INotify stuff might work but I don't know where I need to update it and exactly how to do so.</p> <p><strong>Edit:</strong> My XAML template for the treeview is as follows:</p> <pre> <code> &lt;TreeView Name="tvInstance" ItemsSource="{Binding}" TreeViewItem.Selected="tviSelected" IsTextSearchEnabled="True"&gt; &lt;TreeView.ItemContainerStyle&gt; &lt;Style&gt; &lt;Setter Property="TreeViewItem.IsExpanded" Value="{Binding Path=Value.Expanded, Mode=TwoWay}" /&gt; &lt;/Style&gt; &lt;/TreeView.ItemContainerStyle&gt; &lt;TreeView.ItemTemplate&gt; &lt;HierarchicalDataTemplate ItemsSource="{Binding Path=Value.CustomClass}" ItemContainerStyle="{x:Null}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Label Content="{Binding Path=Key}"/&gt; &lt;/StackPanel&gt; &lt;HierarchicalDataTemplate.ItemTemplate&gt; &lt;HierarchicalDataTemplate ItemsSource="{Binding Path=Value.AnotherClass}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Image Source="{Binding Path=Value.Status, Converter={StaticResource convertstatus} }" Width="10" Height="10"/&gt; &lt;Label Content="{Binding Path=Key}" /&gt; &lt;/StackPanel&gt; &lt;HierarchicalDataTemplate.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Image Source="{Binding Path=Value, Converter={StaticResource convertstatus} }" Width="10" Height="10"/&gt; &lt;Label Content="{Binding Path=Key}" /&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/HierarchicalDataTemplate.ItemTemplate&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/HierarchicalDataTemplate.ItemTemplate&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/TreeView.ItemTemplate&gt; &lt;/TreeView&gt; </code> </pre> <p>EDIT: After adding all INotifyProperty events in my mainclass, my CustomClass, and my InnerClass, it still doesn't work. I'm using the Dr. WPF version of ObservableDictionary (and using a dictionary is crucial to my application since I need to do lots of lookups). Help!</p> <h1>Epilogue</h1> <p>The answers in this page are correct in that INotifyPropertyChanged needs to be implemented on properties I want updated in the UI.</p> <p>I found that binding the dictionary was too much trouble so I kept both an ObservableCollection and a Dictionary. I used the dictionary for lookup and the collection for binding (since both use the same reference to the object, removing was easy with the collection and the only O(n) operation).</p> <p>With regards to updating in the UI, please refer to the other posts on this page.</p>
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    1. COAre you re-instantiating the sub1item dictionary? If so then you'll need to implement INotifyPropertyChanged in the class that contains it.
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    2. COCustomClass has a Refresh() method that sets sub1item = new ObservableDictionary<..>(); Then gets all the InnerClass items again. However, they're pretty much the same items. I just want to update the ones that are changed. Ie. Percolate up changes.
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    3. CODid you ever find a way to solve this?
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