DisplayMemberPath doesn't affect the selected item in text area of the ComboBox?

DisplayMemberPath doesn't affect the selected item in text area of the ComboBox?

• rahsoftware

  Hi Thomas,

  I can't reproduce what you experienced, here's what I tried:

  <ComboBox DisplayMemberPath="Length" xmlns:s="clr-namespace:System;assembly=mscorlib">
  <s:String>a</s:String>
  <s:String>aa</s:String>
  <s:String>aaa</s:String>
  </ComboBox>

  I see 1, 2, 3 listed, then when I select an individual item I still see only the corresponding number.

  
  

• deulu

  I found it. I missed:
  ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"

  Thanks for your help.

  Best regards,
  Thomas Andersen

  
  

• Bigmo

  Don't have a chance to try this right now, but I think you might want to set the Content property of the ContentPresenter to just be {Binding}.
  

• Antonio Bevilacqua

  Ohh, you are right. I found out it has to do with my ControlTemplate.

  I use something like this (simplyfied):

  <Grid>
  
  <Grid.Resources>
  
  <ControlTemplate x:Key="ComboBoxTemplate" TargetType="ComboBox">
  <Grid SnapsToDevicePixels="True">
  <Border BorderBrush="{TemplateBinding Border.BorderBrush}"
  BorderThickness="{TemplateBinding Border.BorderThickness}"
  Name="Bd" Background="{TemplateBinding Panel.Background}"
  Padding="1,1,1,1">
  <Grid Grid.IsSharedSizeScope="True">
  <Grid.ColumnDefinitions>
  <ColumnDefinition Width="1" />
  <ColumnDefinition Width="*" />
  <ColumnDefinition Width="Auto" />
  </Grid.ColumnDefinitions>
  <Border Margin="{TemplateBinding Control.Padding}"
  Name="SelectedItemBorder"
  Grid.ColumnSpan="2" />
  <ContentPresenter Margin="{TemplateBinding Control.Padding}"
  HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}"
  VerticalAlignment="{TemplateBinding Control.VerticalContentAlignment}"
  SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}"
  ContentTemplate="{TemplateBinding ComboBox.SelectionBoxItemTemplate}"
  Content="{TemplateBinding ComboBox.SelectionBoxItem}"
  Grid.Column="1" />
  <ToggleButton x:Name="ToggleButton"
  Grid.Column="2"
  IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}">
  xx
  </ToggleButton>
  </Grid>
  </Border>
  <Popup Placement="Bottom" Name="PART_Popup" Focusable="False" MinWidth="{TemplateBinding FrameworkElement.ActualWidth}" MaxHeight="{TemplateBinding ComboBox.MaxDropDownHeight}" AllowsTransparency="True" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
  <Border BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1,1,1,1" Name="DropDownBorder" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
  <ScrollViewer>
  <ItemsPresenter SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" KeyboardNavigation.DirectionalNavigation="Contained" />
  </ScrollViewer>
  </Border>
  </Popup>
  </Grid>
  </ControlTemplate>
  
  <Style TargetType="{x:Type ComboBox}">
  <Setter Property="Template" Value="{StaticResource ComboBoxTemplate}" />
  </Style>
  
  </Grid.Resources>
  
  <ComboBox Height="26" Margin="161,158,224,0" Name="comboBox1" VerticalAlignment="Top" DisplayMemberPath="Length" xmlns:s="clr-namespace:System;assembly=mscorlib">
  <s:String>a</s:String>
  <s:String>aa</s:String>
  <s:String>aaa</s:String>
  </ComboBox>
  
  </Grid>

  I guess the problem is the ContentPresenter.
  Someone knows if I'm missing a TemplateBinding or do I need to change the Template

  Best regards,
  Thomas Andersen

  
  
• DisplayMemberPath doesn't affect the selected item in text area of the ComboBox?