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POruntime Exception when binding to a datacontext of a user control
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  1. POruntime Exception when binding to a datacontext of a user control
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    copied!<p>Here is the XAML for the main page.</p> <pre><code>&lt;StackPanel x:Name="menuStackPanel" Grid.Row="4" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center"&gt; &lt;StackPanel.DataContext&gt; &lt;Model:GameSettings/&gt; &lt;/StackPanel.DataContext&gt; &lt;uilibrary:CustomImageButton x:Name="btnPlay" Scale="1.5" ReadyImage="/App;component/Images/Menus/menu_play.png" SelectedImage="/App;component/Images/Menus/menu_play_selected.png" Margin="5"/&gt; &lt;uilibrary:CustomImageButton x:Name="btnPlanet" StickyState="True" Scale="1.5" ReadyImage="/App;component/Images/Menus/menu_planet.png" SelectedImage="/App;component/Images/Menus/menu_planet_selected.png" AIsSelected="{Binding Path=UsePlanet, Mode=TwoWay, ElementName=menuStackPanel}" Margin="5"&gt; &lt;/uilibrary:CustomImageButton&gt; &lt;uilibrary:CustomImageButton x:Name="btnGravity" StickyState="True" Scale="1.5" ReadyImage="/App;component/Images/Menus/menu_gravity.png" SelectedImage="/App;component/Images/Menus/menu_gravity_selected.png" AIsSelected="True" Margin="5"&gt; &lt;/uilibrary:CustomImageButton&gt; &lt;/StackPanel&gt; </code></pre> <p>Here is the XAML for the UserControl 'CustomImageButon'</p> <pre><code>&lt;UserControl x:Class="UILibrary.CustomImageButton" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" d:DesignHeight="480" d:DesignWidth="480"&gt; &lt;Grid x:Name="LayoutRoot" Background="Transparent"&gt; &lt;Image x:Name="MyImage" Stretch="None" HorizontalAlignment="Center" VerticalAlignment="Center"&gt; &lt;Image.RenderTransform&gt; &lt;CompositeTransform x:Name="buttonTransform"/&gt; &lt;/Image.RenderTransform&gt; &lt;/Image&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>Here is the code for the UsePlanet property, the value of 'MyUsePlanet' defaults to false.</p> <pre><code>public bool UsePlanet { get { return MyUsePlanet; } set { MyUsePlanet = value; IsolatedStorageSettings.ApplicationSettings[GameSettings.key_planet] = value; IsolatedStorageSettings.ApplicationSettings.Save(); this.OnPropertyChanged("UsePlanet"); } } </code></pre> <p>Here is my Exception information</p> <pre><code>A first chance exception of type 'System.ArgumentException' occurred in mscorlib.dll 'UI Task' (Managed): Loaded 'System.SR.dll' A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll A first chance exception of type 'MS.Internal.NativeParseException' occurred in System.Windows.dll A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.dll An unhandled exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.dll Additional information: Set property 'UILibrary.CustomImageButton.AIsSelected' threw an exception. [Line: 95 Position: 46] </code></pre> <p>I know it has something to do with <code>AIsSelected="{Binding Path=UsePlanet, Mode=TwoWay, ElementName=menuStackPanel}"</code> because if I just set it to "True" then the problem goes away but I would like it bound to my model. Also other bindings such as this one work just fine.</p> <pre><code>&lt;TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="24" Text="{Binding ShipAScore}"&gt; &lt;TextBlock.DataContext&gt; &lt;Model:Scores/&gt; &lt;/TextBlock.DataContext&gt; &lt;/TextBlock&gt; </code></pre> <p><strong>UDATE 4/28/2013</strong> Adding a Dependency Property to the code behind of my UserControl solved this issue.</p> <pre><code>public static readonly DependencyProperty AIsSelectedProperty = DependencyProperty.Register("IsSelected", typeof(bool), typeof(CustomImageButton), new PropertyMetadata(false)); </code></pre>
 

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