WPF 获取ControlTemplate 中的控件方法

                CheckBox cbSelect = (CheckBox)(ListBoxView.Items[i] as ListBoxItem).Template.FindName("cbSelect", ListBoxView.Items[i] as ListBoxItem);
                TextBlock textblackConnPointNum = (TextBlock)(ListBoxView.Items[i] as ListBoxItem).Template.FindName("textblackConnPointNum", ListBoxView.Items[i] as ListBoxItem);
                TextBlock textblackConnPointNam = (TextBlock)(ListBoxView.Items[i] as ListBoxItem).Template.FindName("textblackConnPointName", ListBoxView.Items[i] as ListBoxItem);
                ComboBox cbGroup = (ComboBox)(ListBoxView.Items[i] as ListBoxItem).Template.FindName("cbGroup", ListBoxView.Items[i] as ListBoxItem);
                CheckBox cbPublic = (CheckBox)(ListBoxView.Items[i] as ListBoxItem).Template.FindName("cbPublic", ListBoxView.Items[i] as ListBoxItem);

对应着xaml:

<ContentControl>
  <Grid>
     <CheckBox Name="cbSelect" Margin="2,0,0,0" VerticalAlignment="Center" IsChecked="{Binding IsSelected, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"  <ContentPresenter Margin="2"/>
5  　 <TextBlock Width="80" Name="textblackConnPointNum" TextAlignment="Center" Text="{Binding Path=ConnPointNum}"/>
6　　   <TextBlock Width="150" Name="textblackConnPointName" Text="{Binding Path=ConnPointName}" TextAlignment="Center"/>
......                           
  </Grid>
</ContentControl>

在ControlTemplate中找控件最重要的就是让控件初始化到visualtree上，所以如何没有找到ControlTemplate的控件就有可能是控件还未能加载到visualtree。

可以用一下两种方式强制刷新模板控件至visualtree.

第一种是UpdateLayout()  方法。

但是MSDN提示：如果 UI 中存在大量元素，则频繁调用 InvalidateArrange（尤其是频繁调用 UpdateLayout）将会对性能产生重大影响。除非代码中后续调用其他 API 绝对需要精确的布局状态，否则请避免调用此方法。

第二种方案：

  private delegate void NoArgDelegate();

        public static void Refresh(DependencyObject obj)
        {

            obj.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.ApplicationIdle, (NoArgDelegate)delegate { });

        }