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POWPF DataBinding Issues - Possible Noob Problems
 

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  1. POWPF DataBinding Issues - Possible Noob Problems
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    <p>I am trying to bind a ViewModel property of type Visibility to the visibility property on a Dock Panel:</p> <p><em><strong>Updated ViewModel Code</em></strong>:</p> <pre><code>public class SelectWaferButtonViewModel : INotifyPropertyChanged { private bool isClicked; public SelectWaferButtonViewModel() { isClicked = false; } public bool IsControlVisible { get { return isClicked; } set { isClicked = value; OnPropertyChanged("IsControlVisible"); } } public event PropertyChangedEventHandler PropertyChanged; public void OnButtonClick() { if (isClicked) { IsControlVisible = false; } else { IsControlVisible = true; } } protected virtual void OnPropertyChanged(string property) { if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs(property)); } } } </code></pre> <p><em><strong>and here is my updated XAML code</em></strong>:</p> <pre><code> &lt;DockPanel Name="tvwDockPanel" Width="200" Visibility="{Binding IsControlVisible, FallbackValue=Collapsed, Converter={StaticResource BoolToVisConverter}}" DockPanel.Dock="Left"&gt; &lt;DockPanel DockPanel.Dock="Top" Height="22"&gt; &lt;/DockPanel&gt; </code></pre> <p>and I set the data context in the code behind with this line:</p> <pre><code> tvwDockPanel.DataContext = btnSelectWaferViewModel; </code></pre> <p>where btnSelectWaferViewModel is the ViewModel object for this situation.</p> <p><em><strong>and for fun, here is my code behind</em></strong>:</p> <pre><code>public partial class WaferTrackerWindow : Window { List&lt;ISubscribeEvents&gt; subscriptionList; SelectWaferButtonViewModel btnSelectWaferViewModel; public WaferTrackerWindow() { InitializeComponent(); this.InstantiateObjects(); this.SubscribeEvents(); this.SetDataContexts(); } #region Methods private void SetDataContexts() { tvwDockPanel.DataContext = btnSelectWaferViewModel.IsControlVisible; } private void SubscribeEvents() { foreach (ISubscribeEvents subscriber in subscriptionList) { subscriber.SubscribeEvents(); } } private void InstantiateObjects() { btnSelectWaferViewModel = new SelectWaferButtonViewModel(); subscriptionList = new List&lt;ISubscribeEvents&gt;(); subscriptionList.Add( new Classes.WaferTrackerWindow.SelectWaferButtonView(btnSelectWafer, btnSelectWaferViewModel)); } #endregion } </code></pre> <p>All I want to do click the button btnSelectWafer and have the tvwDockPanel's visibility property to get to set to Visible via binding. Then when you click again on btnSelectWafer, tvwDockPanel's visibility property gets set back to Collapsed again. tvwDockPanel's visibility will only ever be either Collapsed or Visible.</p> <p>Any help would be awesome, I am rather new to this whole data binding concept.</p>
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    1. COTwo questions, 1) Have you enabled the binding trace messages in visual studio (tools -> options -> debugging -> Output Window), 2) Does anything happen at all or are there any binding errors in the output window?
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    2. CODo you see any binding errors in the output window? Also, can you show where you are creating your view model (btnSelectWaferViewModel)?
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    3. COCoding Gorilla: I just enabled the binding errors in my output window, here are the errors i get:
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