无法在SilverLight5中的DataTemplate中找到控件

时间:2015-05-26 20:40:44

标签: c# datatemplate silverlight-5.0 itemscontrol

我正在使用DataTemplate我声明了两个Buttons,默认情况下它们是不可见的。现在我想根据某些条件在后面的代码中使它们Visible,但我无法找到这些控件。

以下是我的代码:

XAML:

<ItemsControl x:Name="SynonymsItemsControl" ItemsSource="{Binding Synonyms}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <StackPanel Orientation="Horizontal" Margin="0,5,0,0" />
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <StackPanel x:Name="SynonymsStackPanel">
                <CheckBox x:Name="SynonymsChkBx" Content="{Binding Display}" Margin="10,0,0,0" />

                WANT TO FIND THESE TWO BUTTONS
                <Button x:Name="AddSynonymsBtn" Margin="525, 0, 0, 0" ToolTipService.ToolTip="Add Synonyms" Visibility="Collapsed">
                    <Image Source="/Images/AddSynonyms.png" Height="24"/>
                </Button>
                <Button x:Name="CancelSynonymsBtn" Margin="600, 0, 0, 0" ToolTipService.ToolTip="Cancel Synonyms" Visibility="Collapsed">
                    <Image Source="/Images/CancelSynonyms.png" Height="24"/>
                </Button>

            </StackPanel>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

代码隐藏:

我可以通过这样做找到ItemControl,

System.Windows.Controls.ItemsControl itemControl = (from sp in selectedTreeViewItem.GetVisualDescendants().OfType<System.Windows.Controls.ItemsControl>()
                                                    where sp.Name == "SynonymsItemsControl"
                                                    select sp).FirstOrDefault();

现在当我想找到在ItemsControl - &gt; DataTemplate中声明的按钮时,它会显示为Null

Button AddSynonymsBtn = (from btn in itemControl.GetVisualDescendants().OfType<Button>()
                         where btn.Name == "AddSynonymsBtn"
                         select btn).FirstOrDefault();

所以我想知道我是否需要找到ItemsControl?如果是的话,为什么我找不到这些按钮?

我也试过了 var findControl = temControl.ItemContainerGenerator.ContainerFromIndex(index);但结果相同(Null)。

1 个答案:

答案 0 :(得分:0)

您可以使用Template.FindName(string Name);

从后面轻松获取控件
private Button _partSynonyms = null;

public MyControlTemplate{
   Loaded += (sender, e) => OnLoaded();
}

private void OnLoaded(){
   _partSynonyms = (Button)Template.FindName("PART_AddSynonymsBtn"); //You "should" use PART_ as a prefix in a Template
  if(_partSynonyms == null)
     //Button not found -> Log some error but you should not throw an exception
}