从选定的 ListBoxItem 模板获取文本块值

Question

有人知道如何从运行时生成的列表框项目中提取文本块文本吗？

我有一个自定义的 ListBoxItem，其中包含一个 SymbolIcon 和一个 textBlock。我只需要 textBlock 值。

private void AlbumSongList_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var selected = AlbumSongList.SelectedItem as ListBoxItem;
        DataTemplate template = selected.ContentTemplate;


        Debug.WriteLine("You have selected the song: " + selected.ToString());
    }

这是包含文本块的自定义控件

<Style x:Key="CustomListBoxItem1" TargetType="ListBoxItem">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="TabNavigation" Value="Local"/>
            <Setter Property="Padding" Value="12,11,12,13"/>
            <Setter Property="HorizontalContentAlignment" Value="Left"/>
            <Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListBoxItem">
                        <Grid x:Name="LayoutRoot" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}">
                            <Grid.Resources>
                                <Style x:Key="BaseContentPresenterStyle" TargetType="ContentPresenter">
                                    <Setter Property="FontFamily" Value="Segoe UI"/>
                                    <Setter Property="FontWeight" Value="Light"/>
                                    <Setter Property="FontSize" Value="15"/>
                                    <Setter Property="TextWrapping" Value="NoWrap"/>
                                    <Setter Property="LineStackingStrategy" Value="MaxHeight"/>
                                    <Setter Property="TextLineBounds" Value="Full"/>
                                    <Setter Property="OpticalMarginAlignment" Value="TrimSideBearings"/>
                                    <Setter Property="Height" Value="30" />
                                </Style>
                                <Style x:Key="BodyContentPresenterStyle" BasedOn="{StaticResource BaseContentPresenterStyle}" TargetType="ContentPresenter">
                                    <Setter Property="FontWeight" Value="Normal"/>
                                    <Setter Property="FontSize" Value="15"/>
                                </Style>
                            </Grid.Resources>

                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="50"/>
                                <ColumnDefinition Width="50"/>
                                <ColumnDefinition />
                            </Grid.ColumnDefinitions>
                            <Rectangle Grid.Column="2" x:Name="PressedBackground" Fill="Transparent" Control.IsTemplateFocusTarget="True"/>
                            <SymbolIcon Symbol="MusicInfo" />

                            <TextBlock Grid.Column="1" Text="{Binding SongNumber}" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                            <TextBlock Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="10,0" Text="{Binding Song}" FontSize="15"/> <!--TextBlock Needed-->

                            <ContentPresenter x:Name="ContentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" ContentTransitions="{TemplateBinding ContentTransitions}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" Style="{StaticResource BodyContentPresenterStyle}" TextWrapping="NoWrap" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualState x:Name="Normal"/>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseMediumLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="PointerOver">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PressedBackground" Storyboard.TargetProperty="Fill">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PressedBackground" Storyboard.TargetProperty="Fill">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListMediumBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Selected">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PressedBackground" Storyboard.TargetProperty="Fill">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="SelectedUnfocused">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PressedBackground" Storyboard.TargetProperty="Fill">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentLowBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="SelectedPointerOver">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PressedBackground" Storyboard.TargetProperty="Fill">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentMediumBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="SelectedPressed">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="PressedBackground" Storyboard.TargetProperty="Fill">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter" Storyboard.TargetProperty="Foreground">
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}"/>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>


                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

同样，如果您看到 "Textblock" 的文本绑定源为 Sing，这就是我需要的文本值。

Answer 1

ListBox has a default selection behavior that depends on what the items source is (the type that's used for ItemsSource). So the SelectedItem is the type of your Model class, so you can get the text of the TextBlock 来自您选择的模型。

比如你的模型class名字是Model，那么你可以使用下面的代码获取文字，

private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    var selected = AlbumSongList.SelectedItem as Model;

    Debug.WriteLine("You have selected the song: Song Number is {0}, and Song is {1}",
        selected.SongNumber, selected.Song);
}

从选定的 ListBoxItem 模板获取文本块值

Get Textblock value from selected ListBoxItem Template

c#

uwp

win-universal-app

windows-10-universal

uwp-xaml