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POWPF ContextMenu Dictionary<Key, List<Value>> databinding
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  1. POWPF ContextMenu Dictionary<Key, List<Value>> databinding
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    copied!<p>Assume the following class definitions.</p> <pre><code> public enum ContentType { Playlist, Audio, Video, Picture } public interface IDataProvider { string Name { get; } } public class ProviderList : List&lt;IDataProvider&gt; { } public class MainViewModel { public Dictionary&lt;ContentType, ProviderList&gt; ProvidersDictionary; public MainViewModel() { if (IsInDesignMode) { // Code runs in Blend --&gt; create design time data. } else { // Code runs "for real" this.ProvidersDictionary = new Dictionary&lt;ContentType, ProviderList&gt;(); ProviderList providerList = new ProviderList(); providerList.Add(new DataProvider()); this.ProvidersDictionary.Add(ContentType.Audio, providerList); providerList = new ProviderList(providerList); providerList.Add(new DataProvider()); this.ProvidersDictionary.Add(ContentType.Video, providerList); } } } </code></pre> <p>So, this ProvidersDictionary property is bound to Window context menu as follows:</p> <pre><code> &lt;Window.ContextMenu&gt; &lt;ContextMenu ItemsSource="{Binding ProvidersDictionary}"&gt; &lt;ContextMenu.ItemTemplate&gt; &lt;HierarchicalDataTemplate ItemsSource="{Binding Value}"&gt; &lt;TextBlock Margin="1" Text="{Binding Key}" Height="20"/&gt; &lt;HierarchicalDataTemplate.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Name}" /&gt; &lt;/DataTemplate&gt; &lt;/HierarchicalDataTemplate.ItemTemplate&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/ContextMenu.ItemTemplate&gt; &lt;/ContextMenu&gt; &lt;/Window.ContextMenu&gt; </code></pre> <p>The question is: how to make ICommand databinding for the DataProvider menu item click and to retrieve data type (enum type) and data provider (IDataProvider interface) within the command' Execute method.</p> <p><img src="https://i.stack.imgur.com/GKf9y.png" alt=""></p> <p><strong>Update</strong> I want to have some command class to be bound to MenuItems like:</p> <pre><code> class DataProviderMenuSelectCommand : ICommand { #region ICommand Members public void Execute(object parameter) { ContentTypeProviderPair contentProviderPair = parameter as ContentTypeProviderPair; if (contentProviderPair != null) { // contentProviderPair.Type property - ContentType // contentProviderPair.Provider property - IProvider } } } </code></pre> <p>MainViewModel will expose instance of this command class as a property.</p>
 

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