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

概述我正在创建一个WP 8.1 Silverlight应用程序. 我有一个字符串名称的ObservableCollection,它被设置为ListBox的ItemsSource. ListBox中按钮的名称是什么.然后我想从ListBox中提取按钮,但返回值是string类型. xaml代码是： <ListBox x:Name="Game_ScrollViewer_online" Margin="41 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,它被设置为ListBox的ItemsSource. ListBox中按钮的名称是什么.然后我想从ListBox中提取按钮,但返回值是string类型.

xaml代码是：

<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>

然后我想要提取按钮元素：

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}

但正如所说的返回类型是字符串.

为什么不是按钮？有没有办法访问按钮？

解决方法 你需要 FrameworkTemplate.FindName Method (String, FrameworkElement)用于此目的：

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,请使用FindDescendant,如下所示：

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;}

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