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POXAML Tool Tip Data Context and Multi Binding
 

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  1. POXAML Tool Tip Data Context and Multi Binding
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    <p>I have a ListView in my XAML and I am trying to hook up a MultiBinding Converter. </p> <pre><code>&lt;ListView Grid.Column="4" Grid.Row="1" Grid.RowSpan="5" Margin="8,0,8,8" HorizontalAlignment="Stretch" Name="lvDisplayType" ItemsSource="{Binding Path=Types}" SelectedItem="{Binding Path=Current.Opt}" VerticalAlignment="Stretch" SelectionChanged="lvType_SelectionChanged" SelectionMode="Single" ScrollViewer.HorizontalScrollBarVisibility="Disabled"&gt; &lt;ListView.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;DockPanel HorizontalAlignment="Center"&gt; &lt;TextBlock Text="{Binding Path=., Converter={StaticResource DisplayConverter}}" HorizontalAlignment="Center" Padding="6" VerticalAlignment="Center" TextWrapping="Wrap"&gt; &lt;TextBlock.ToolTip&gt; &lt;ToolTip DataContext="{Binding Path=Current}"&gt; &lt;MultiBinding Converter="{StaticResource OptConverter}"&gt; &lt;Binding Path="Opt" /&gt; &lt;Binding Path="Type" /&gt; &lt;/MultiBinding&gt; &lt;/ToolTip&gt; &lt;/TextBlock.ToolTip&gt; &lt;/TextBlock&gt; &lt;/DockPanel&gt; &lt;/DataTemplate&gt; &lt;/ListView.ItemTemplate&gt; &lt;/ListView&gt; </code></pre> <p>The code not working is:</p> <pre><code> &lt;TextBlock.ToolTip&gt; &lt;ToolTip DataContext="{Binding Path=Current}"&gt; &lt;MultiBinding Converter="{StaticResource OptConverter}"&gt; &lt;Binding Path="Opt" /&gt; &lt;Binding Path="Type" /&gt; &lt;/MultiBinding&gt; &lt;/ToolTip&gt; &lt;/TextBlock.ToolTip&gt; </code></pre> <p>At present the Converter is returning an empty string as both 'values[0] == System.Windows.DependencyProperty.UnsetValue' and 'values[1] == System.Windows.DependencyProperty.UnsetValue' return true. These values are never set.</p> <p>Because of the logical tree (I think) the TextBlock.ToolTip default binding is 'Current.Opt'. For the MultiBinding I also need to refer to 'Type' which is another property of 'Current'. So to get around this I have set 'ToolTip DataContext="{Binding Path=Current}"' - this isn't working as expected - what am I doing wrong?</p> <p>I know I could do this easily in the Code behind, but we are employing MVVM, so would like to avoid it if possible.</p> <p>Any help greatly appreciated!</p> <p>Thank you</p>
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