WPF：组合框自定义 ContentTemplate 显示命名空间.classname 作为所选项目文本

Question

我正在尝试按如下方式设置组合框的样式。

下拉列表显示正确的名称列表，但选择时，namespace.classname 显示为组合文本而不是所选名称。

我有以下组合框的样式和声明。有人知道我做错了什么吗？谢谢！

<!--ComboBox Style-->
<Style TargetType="ComboBox" x:Key="DefaultComboBoxStyle">
    <Setter Property="MinHeight" Value="26" />
    <Setter Property="Padding" Value="6,4,25,4"/>
    <Setter Property="Foreground" Value="{StaticResource TextBrush}"/>
    <Setter Property="FontFamily" Value="{StaticResource ContentFontFamily}"/>
    <Setter Property="FontSize" Value="{StaticResource ContentFontSize}"/>
    <Setter Property="TextOptions.TextHintingMode" Value="Animated"/>
    <Setter Property="Background" Value="{StaticResource TransparentLightestBrush}" />            
    <Setter Property="HorizontalContentAlignment" Value="Left"/>
    <Setter Property="BorderThickness" Value="1"/>        
    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
    <Setter Property="BorderBrush" Value="{StaticResource TextBoxBorderBrush}"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ComboBox">
                <Grid>
                    <Grid.Resources>
                        <Style x:Key="comboToggleStyle" TargetType="ToggleButton">
                            <Setter Property="Foreground" Value="{StaticResource TextBrush}"/>
                            <Setter Property="Background" Value="{StaticResource GrayBrush7}"/>
                            <Setter Property="BorderBrush" Value="{StaticResource TextBoxBorderBrush}"/>
                            <Setter Property="BorderThickness" Value="1"/>
                            <Setter Property="Padding" Value="3"/>
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="ToggleButton">
                                        <Grid>
                                            <VisualStateManager.VisualStateGroups>
                                                <VisualStateGroup x:Name="CommonStates">
                                                    <VisualState x:Name="Normal"/>
                                                    <VisualState x:Name="MouseOver">
                                                        <Storyboard>
                                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="MouseOverBorder">
                                                                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                                                            </DoubleAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                    <VisualState x:Name="Pressed">
                                                        <Storyboard>
                                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="PressedBorder">
                                                                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                                                            </DoubleAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                    <VisualState x:Name="Disabled"/>
                                                </VisualStateGroup>
                                                <VisualStateGroup x:Name="CheckStates">
                                                    <VisualState x:Name="Checked">
                                                        <Storyboard>
                                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="CheckedRectangle">
                                                                <EasingDoubleKeyFrame KeyTime="0:0:0.1" Value="1"/>
                                                            </DoubleAnimationUsingKeyFrames>
                                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="CheckedInnerRectangle">
                                                                <EasingDoubleKeyFrame KeyTime="0:0:0.1" Value="1"/>
                                                            </DoubleAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                    <VisualState x:Name="Unchecked"/>
                                                </VisualStateGroup>
                                                <VisualStateGroup x:Name="FocusStates">
                                                    <VisualState x:Name="Focused">
                                                        <Storyboard>
                                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="FocusRectangle">
                                                                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                                                            </DoubleAnimationUsingKeyFrames>
                                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="FocusInnerRectangle">
                                                                <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                                                            </DoubleAnimationUsingKeyFrames>
                                                        </Storyboard>
                                                    </VisualState>
                                                    <VisualState x:Name="Unfocused"/>
                                                </VisualStateGroup>
                                            </VisualStateManager.VisualStateGroups>
                                            <Border x:Name="Background" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="3"/>
                                            <Rectangle x:Name="DisabledVisualElement" Fill="{StaticResource WhiteBrush}" IsHitTestVisible="false" Opacity="0" RadiusY="3" RadiusX="3"/>
                                            <Border x:Name="MouseOverBorder" Background="{StaticResource TransparentDarkBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3.5" Opacity="0"/>
                                            <Border x:Name="PressedBorder" Background="{StaticResource GrayBrush5}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3.5" Opacity="0"/>
                                            <Rectangle x:Name="FocusRectangle" Stroke="{StaticResource TextBoxMouseOverInnerBorderBrush}" RadiusY="4" RadiusX="4" Margin="-1" Opacity="0" />
                                            <Rectangle x:Name="FocusInnerRectangle" StrokeThickness="{TemplateBinding BorderThickness}" Stroke="{StaticResource TextBoxMouseOverBorderBrush}" RadiusX="3" RadiusY="3" Opacity="0" />
                                            <Rectangle x:Name="CheckedRectangle" StrokeThickness="{TemplateBinding BorderThickness}" RadiusY="4" RadiusX="4" Opacity="0" Stroke="{StaticResource TextBoxMouseOverBorderBrush}" />
                                            <Rectangle x:Name="CheckedInnerRectangle" StrokeThickness="{TemplateBinding BorderThickness}" RadiusY="4" RadiusX="4" Opacity="0" Margin="1" Stroke="{StaticResource TextBoxMouseOverInnerBorderBrush}" />
                                            <ContentPresenter x:Name="contentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                            <Rectangle x:Name="FocusVisualElement" IsHitTestVisible="false" Margin="1" RadiusY="3.5" RadiusX="3.5" Stroke="{StaticResource HighlightBrush}" StrokeThickness="1" Visibility="Collapsed"/>
                                        </Grid>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </Grid.Resources>
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualState x:Name="Normal"/>
                            <VisualState x:Name="MouseOver"/>
                            <VisualState x:Name="Disabled">
                                <Storyboard>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="DisabledVisualElement">
                                        <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0.45"/>
                                    </DoubleAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                        <VisualStateGroup x:Name="FocusStates">
                            <VisualState x:Name="Focused">
                                <Storyboard>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="FocusRectangle">
                                        <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                                    </DoubleAnimationUsingKeyFrames>
                                    <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="FocusInnerRectangle">
                                        <EasingDoubleKeyFrame KeyTime="0" Value="1"/>
                                    </DoubleAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="Unfocused"/>
                            <VisualState x:Name="FocusedDropDown">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Duration="00:00:00" Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="PopupBorder">
                                        <DiscreteObjectKeyFrame KeyTime="00:00:00">
                                            <DiscreteObjectKeyFrame.Value>
                                                <Visibility>Visible</Visibility>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                        <VisualStateGroup x:Name="ValidationStates">
                            <VisualState x:Name="Valid"/>
                            <VisualState x:Name="InvalidUnfocused">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <Visibility>Visible</Visibility>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                            <VisualState x:Name="InvalidFocused">
                                <Storyboard>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="ValidationErrorElement">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <Visibility>Visible</Visibility>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IsOpen" Storyboard.TargetName="validationTooltip">
                                        <DiscreteObjectKeyFrame KeyTime="0">
                                            <DiscreteObjectKeyFrame.Value>
                                                <sys:Boolean>True</sys:Boolean>
                                            </DiscreteObjectKeyFrame.Value>
                                        </DiscreteObjectKeyFrame>
                                    </ObjectAnimationUsingKeyFrames>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <Border x:Name="ContentPresenterBorder" Background="{TemplateBinding Background}">
                        <Grid>
                            <ContentPresenter Content="{TemplateBinding SelectionBoxItem}"
                                 ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
                                 ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}"
                                 Grid.Column="1" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            <ToggleButton x:Name="DropDownToggle"  IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                          BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" HorizontalAlignment="Stretch" HorizontalContentAlignment="Right" Margin="0" Style="{StaticResource comboToggleStyle}" VerticalAlignment="Stretch">
                                <Path x:Name="BtnArrow" Data="F1 M 301.14,-189.041L 311.57,-189.041L 306.355,-182.942L 301.14,-189.041 Z " HorizontalAlignment="Right" Height="4" Margin="0,0,6,0" Stretch="Uniform" Width="8">
                                    <Path.Fill>
                                        <SolidColorBrush x:Name="BtnArrowColor" Color="{StaticResource Gray3}"/>
                                    </Path.Fill>
                                </Path>
                            </ToggleButton>
                        </Grid>
                    </Border>
                    <Rectangle x:Name="FocusRectangle" Stroke="{StaticResource TextBoxMouseOverInnerBorderBrush}" RadiusY="4" RadiusX="4" Margin="-1" Opacity="0" />
                    <Rectangle x:Name="FocusInnerRectangle" StrokeThickness="{TemplateBinding BorderThickness}" Stroke="{StaticResource TextBoxMouseOverBorderBrush}" RadiusX="3" RadiusY="3" Opacity="0" />
                    <Rectangle x:Name="DisabledVisualElement" Fill="{StaticResource DisabledWhiteColorBrush}" IsHitTestVisible="false" RadiusX="3" RadiusY="3" Opacity="0"/>                        
                    <Popup x:Name="PART_Popup" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{TemplateBinding ActualWidth}"
                           AllowsTransparency="True" Focusable="False" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
                        <Border Effect="{StaticResource DropShadowBrush}" x:Name="PopupBorder" BorderThickness="{TemplateBinding BorderThickness}" HorizontalAlignment="Stretch" Height="Auto" BorderBrush="{StaticResource ComboBoxPopupBrush}" Background="{StaticResource WhiteBrush}">
                            <ScrollViewer x:Name="ScrollViewer" BorderThickness="0" Padding="1">
                                <ItemsPresenter/>
                            </ScrollViewer>
                        </Border>
                    </Popup>
                </Grid>
                <ControlTemplate.Triggers>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsSelectionBoxHighlighted" Value="True"/>
                            <Condition Property="IsDropDownOpen" Value="False"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                    </MultiTrigger>
                    <Trigger Property="HasItems" Value="False">
                        <Setter Property="MinHeight" TargetName="PopupBorder" Value="95"/>
                    </Trigger>
                    <Trigger Property="IsGrouping" Value="True">
                        <Setter Property="ScrollViewer.CanContentScroll" Value="False"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

---

编辑：

谢谢伊恩。

这是我用的数据。只需将列表分配给组合框项源的简单操作即可。选择任何名称时，它始终显示“WpfCosmo.Person”，而不是显示“Eric”或“Stan”或“Kyle”。

在我的 ControlsPage.xaml 中：

<ComboBox Height="22" Margin="0,0,0,5" x:Name="comboBox" DisplayMemberPath="Name" SelectedIndex="-1" />

在我的代码后面：

public partial class ControlsPage : Page
{
    public ControlsPage()
    {
        InitializeComponent();

        comboBox.ItemsSource = Person.GetList();
    }
}

public class Person
{
    public string Name { get; set; }
    public string Surname { get; set; }

    public static List<Person> GetList()
    {
        List<Person> SouthPark = new List<Person>() { 
            new Person() { Name = "Eric", Surname="Cartman" },
            new Person() { Name = "Stan", Surname="Marsh" },
            new Person() { Name = "Kyle", Surname="Broflovski" },
            new Person() { Name = "Kenny", Surname="McCormick" },
            new Person() { Name = "Bebe", Surname="Stevens" },
            new Person() { Name = "Clyde", Surname="Donovan" }, 
            new Person() { Name = "Craig", Surname="Tucker" }, 
            new Person() { Name = "Jimmy", Surname="Vulmer" }, 
            new Person() { Name = "Pip", Surname="Pirrup" }, 
            new Person() { Name = "Token", Surname="Black" }, 
            new Person() { Name = "Tweek", Surname="Tweak" }, 
            new Person() { Name = "Wendy", Surname="Testaburger" }, 
            new Person() { Name = "Annie", Surname="Polk" },
            new Person() { Name = "Randy", Surname="Marsh" },
            new Person() { Name = "Sharon", Surname="Marsh" },
            new Person() { Name = "Shelley", Surname="Marsh" },
            new Person() { Name = "Marvin", Surname="Marsh" },
            new Person() { Name = "Jimbo", Surname="Kern" },
            new Person() { Name = "Gerald", Surname="Broflovski" },
            new Person() { Name = "Sheila", Surname="Broflovski" },
            new Person() { Name = "Ike", Surname="Broflovski" },
            new Person() { Name = "Kyle", Surname="Schwartz" },
            new Person() { Name = "Liane", Surname="Cartman" },
            new Person() { Name = "Stuart", Surname="McCormick" },
            new Person() { Name = "Carol", Surname="McCormick" },
            new Person() { Name = "Kevin", Surname="McCormick" },
            new Person() { Name = "Stephen", Surname="Stotch" },
            new Person() { Name = "Linda", Surname="Stotch" },
            new Person() { Name = "Richard", Surname="Tweak" }
        };

        return SouthPark;
    }
} 

Answer 1

尝试删除这部分样式：

Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"

Answer 2

我知道这个话题很老了，但我最近遇到了同样的问题。我想要为我的组合框提供自定义样式，因此我开始在 Visual Studio 中提取默认模板来修改它。但是当我这样做时，我的组合框不再起作用了。

经过对Google的一些研究，我在这里找到了一个解决方案：StackOverFlow：自定义模板对于 ComboBox 忽略 DisplayMemberPath 的使用

问题来自 Visual Studio 模板提取器（我相信对于 Blend 来说也是一样），它忘记了 Content Presenter 中的属性：

ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"

这个简单的属性解决了我的问题。

希望这可以帮助别人。