WPF Toolkit Combobox DisplayMemberPath funktioniert nicht

Question

Ich verwende das sehr praktische WPF Toolkit Xaml, um eine nette GUI zu haben. Ich habe jedoch Probleme mit den Combobox-Elementen. Ich habe erfolgreich an das Combobox-Steuerelement gebunden, aber die Elemente in der Dropdown-Liste zeigen das gebundene Objekt und nicht das Anzeigeelement an. Lustig genug, wenn ich ein Element auswähle, wird das korrekte Anzeigeelement in der Textbox angezeigt.

Jede Hilfe wäre willkommen!

Mark.

Meine XAML die Combobox anzuzeigen:

<ComboBox Name="uxFeatureGroup" Margin="17,16,0,0" Height="23" 
      HorizontalAlignment="Left" 
      VerticalAlignment="Top" Width="162" 
      DisplayMemberPath="FeatureGroupName"></ComboBox> 

und die XAML in WPF-Vorlage:

<Style TargetType="{x:Type ComboBox}"> 
    <Setter Property="SnapsToDevicePixels" Value="true" /> 
    <Setter Property="HorizontalContentAlignment" Value="Stretch" /> 
    <Setter Property="VerticalContentAlignment" Value="Center" /> 
    <Setter Property="FontFamily" Value="Trebuchet MS" /> 
    <Setter Property="FontSize" Value="12" /> 
    <Setter Property="Padding" Value="6,2,25,2" /> 
    <Setter Property="Template"> 
     <Setter.Value> 
      <ControlTemplate TargetType="{x:Type ComboBox}"> 
       <ControlTemplate.Resources> 
        <Storyboard x:Key="FocusedOn"> 
         <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="(UIElement.Opacity)"> 
          <SplineDoubleKeyFrame KeyTime="00:00:00.1000000" Value="1" /> 
         </DoubleAnimationUsingKeyFrames> 
        </Storyboard> 
        <Storyboard x:Key="FocusedOff"> 
         <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="(UIElement.Opacity)"> 
          <SplineDoubleKeyFrame KeyTime="00:00:00.3000000" Value="0" /> 
         </DoubleAnimationUsingKeyFrames> 
        </Storyboard> 
       </ControlTemplate.Resources> 
       <Grid> 
        <ToggleButton Grid.Column="2" Template="{DynamicResource ComboBoxToggleButton}" x:Name="ToggleButton" Focusable="false" IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode="Press" /> 
        <ContentPresenter HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="ContentSite" VerticalAlignment="Center" Content="{TemplateBinding ComboBox.SelectionBoxItem}" ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}" ContentStringFormat="{TemplateBinding ComboBox.SelectionBoxItemStringFormat}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" IsHitTestVisible="False" /> 

        <TextBox Visibility="Hidden" Template="{DynamicResource ComboBoxTextBox}" HorizontalAlignment="Left" Margin="3,3,23,3" x:Name="PART_EditableTextBox" Style="{x:Null}" VerticalAlignment="Center" Focusable="True" Background="Transparent" IsReadOnly="{TemplateBinding IsReadOnly}" /> 
        <Rectangle x:Name="DisabledVisualElement" Fill="{DynamicResource DisabledBackgroundBrush}" Stroke="{DynamicResource DisabledBorderBrush}" RadiusX="0" RadiusY="0" IsHitTestVisible="false" Opacity="0" /> 
        <Rectangle x:Name="FocusVisualElement" Margin="-1" Stroke="{DynamicResource FocusBrush}" StrokeThickness="1" IsHitTestVisible="false" Opacity="0" /> 
        <Popup IsOpen="{TemplateBinding IsDropDownOpen}" Placement="Bottom" x:Name="Popup" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide" Margin="0,1,0,0"> 
         <Grid MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}" x:Name="DropDown" SnapsToDevicePixels="True"> 
          <Border x:Name="DropDownBorder" Margin="0,-1,0,0" BorderBrush="{DynamicResource ControlBorderBrush}" BorderThickness="1" CornerRadius="0,0,3,3" Background="{DynamicResource ControlBackgroundBrush}"> 
           <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" CanContentScroll="True"> 

            <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" /> 

           </ScrollViewer> 
          </Border> 
         </Grid> 
        </Popup> 
       </Grid> 
       <ControlTemplate.Triggers> 
        <Trigger Property="IsFocused" Value="True"> 
         <Trigger.ExitActions> 
          <BeginStoryboard Storyboard="{StaticResource FocusedOff}" x:Name="FocusedOff_BeginStoryboard" /> 
         </Trigger.ExitActions> 
         <Trigger.EnterActions> 
          <BeginStoryboard Storyboard="{StaticResource FocusedOn}" /> 
         </Trigger.EnterActions> 
        </Trigger> 
        <Trigger Property="HasItems" Value="false"> 
         <Setter Property="MinHeight" Value="95" TargetName="DropDownBorder" /> 
        </Trigger> 
        <Trigger Property="IsEnabled" Value="false"> 
         <Setter Property="Foreground" Value="{DynamicResource DisabledForegroundBrush}" /> 
         <Setter Property="Opacity" TargetName="DisabledVisualElement" Value="1" /> 
        </Trigger> 
        <Trigger Property="IsGrouping" Value="true"> 
         <Setter Property="ScrollViewer.CanContentScroll" Value="false" /> 
        </Trigger> 
        <Trigger Property="AllowsTransparency" SourceName="Popup" Value="true"> 
         <Setter Property="CornerRadius" Value="4" TargetName="DropDownBorder" /> 
         <Setter Property="Margin" Value="0,2,0,0" TargetName="DropDownBorder" /> 
        </Trigger> 
        <Trigger Property="IsEditable" Value="true"> 
         <Setter Property="IsTabStop" Value="false" /> 
         <Setter Property="Visibility" Value="Visible" TargetName="PART_EditableTextBox" /> 
         <Setter Property="Visibility" Value="Hidden" TargetName="ContentSite" /> 
        </Trigger> 
       </ControlTemplate.Triggers> 
      </ControlTemplate> 
     </Setter.Value> 
    </Setter> 
</Style> 

Answer 1

bereits.

Entfernen Sie in der ComboBoxItem-Vorlage für das von Ihnen verwendete Design die Attribute Content und ContentTemplate aus ContentPresneter Element.

Anstatt also diese:

<ContentPresenter x:Name="contentPresenter" 
        Content="{TemplateBinding Content}" 
        ContentTemplate="{TemplateBinding ContentTemplate}" 
        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
        Margin="{TemplateBinding Padding}" /> 

Verwendung dieses:

<ContentPresenter x:Name="contentPresenter" 
        HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
        Margin="{TemplateBinding Padding}" />