当 DataTemplate 为 Button 时，ListBox 项返回字符串

Posted 2023-04-12

【中文标题】当 DataTemplate 为 Button 时，ListBox 项返回字符串

【英文标题】：ListBox items return string, when DataTemplate is Button

【发布时间】：2016-03-11 03:12:02

【问题描述】：

我正在创建一个 WP 8.1 Silverlight 应用程序。

我有一个字符串名称的ObservableCollection，它设置为ListBox 的ItemsSource。哪些是ListBox 中的按钮名称。然后我想从ListBox 中提取按钮，但返回值是string 类型。

xaml 代码为：

<ListBox x:Name="Game_ScrollViewer_online" Margin="41,104,128,6" SelectedValuePath="Current_game_button">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Button x:Name="Current_game_button" Content="Binding" 
                    HorizontalAlignment="Center" Height="80" Margin="-14,6,-15,0"
                    VerticalAlignment="Top" Width="210" Template="StaticResource Button_CurrentLayout1" 
                    RenderTransformOrigin="0.5,0.5" Foreground="#FFCBECCB" FontFamily="Times New Roman"
                    Click="LoadGame_online" FontSize="16">
            </Button>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

然后我想提取按钮元素：

for (int i = 0; i < Game_ScrollViewer_online.Items.Count; i++)

     var tempType = Game_ScrollViewer_online.Items[i].GetType();
     Button tempBut = (Game_ScrollViewer_online.Items[i] as Button); 
     //Do stuff with button

但如前所述，返回类型是字符串。

为什么不是按钮？有没有办法访问该按钮？

【参考方案1】：

为此您需要FrameworkTemplate.FindName Method (String, FrameworkElement)：

private childItem FindVisualChild<childItem>(DependencyObject obj)
where childItem : DependencyObject

        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
        
            DependencyObject child = VisualTreeHelper.GetChild(obj, i);
            if (child != null && child is childItem)
                return (childItem)child;
            else
            
                childItem childOfChild = FindVisualChild<childItem>(child);
                if (childOfChild != null)
                    return childOfChild;
            
        
        return null;

然后：

for (int i = 0; i < Game_ScrollViewer_online.Items.Count; i++)

     ListBoxItem GameListBoxItem = (ListBoxItem)(Game_ScrollViewer_online.ItemContainerGenerator.ContainerFromIndex(i));
     ContentPresenter contentPresenter = FindVisualChild<ContentPresenter>(GameListBoxItem);
     DataTemplate myDataTemplate = contentPresenter.ContentTemplate;
     Button tempBut = (Button) myDataTemplate.FindName("Current_game_button", contentPresenter);
     //Do stuff with button

要解决缺少的FindName，请像这样使用FindDescendant：

public T FindDescendant<T>(DependencyObject obj) where T : DependencyObject

    if (obj is T)
        return obj as T;

    int childrenCount = VisualTreeHelper.GetChildrenCount(obj);
    if (childrenCount < 1)
        return null;

    for (int i = 0; i < childrenCount; i++)
    
        DependencyObject child = VisualTreeHelper.GetChild(obj, i);
        if (child is T)
            return child as T;
    

    for (int i = 0; i < childrenCount; i++)
    
        DependencyObject child = FindDescendant<T>(VisualTreeHelper.GetChild(obj, i));
        if (child != null && child is T)
            return child as T;
    

    return null;

【讨论】：

太棒了，效果很好！像您一样提取列表项然后仅使用FindDescendant 它可以工作。更新您的答案，我会将其标记为已解决:)