WPF 获取ControlTemplate 中的控件方法

  
    

   
     1 
   
      CheckBox cbSelect 
   
     =
   
      (CheckBox)(ListBoxView.Items[i] 
   
     as
   
      ListBoxItem).Template.FindName(
   
     "
   
     cbSelect
   
     "
   
     , ListBoxView.Items[i] 
   
     as
   
      ListBoxItem);

   
     2 
   
      TextBlock textblackConnPointNum 
   
     =
   
      (TextBlock)(ListBoxView.Items[i] 
   
     as
   
      ListBoxItem).Template.FindName(
   
     "
   
     textblackConnPointNum
   
     "
   
     , ListBoxView.Items[i] 
   
     as
   
      ListBoxItem);

   
     3 
   
      TextBlock textblackConnPointNam 
   
     =
   
      (TextBlock)(ListBoxView.Items[i] 
   
     as
   
      ListBoxItem).Template.FindName(
   
     "
   
     textblackConnPointName
   
     "
   
     , ListBoxView.Items[i] 
   
     as
   
      ListBoxItem);

   
     4 
   
      ComboBox cbGroup 
   
     =
   
      (ComboBox)(ListBoxView.Items[i] 
   
     as
   
      ListBoxItem).Template.FindName(
   
     "
   
     cbGroup
   
     "
   
     , ListBoxView.Items[i] 
   
     as
   
      ListBoxItem);

   
     5 
   
      CheckBox cbPublic 
   
     =
   
      (CheckBox)(ListBoxView.Items[i] 
   
     as
   
      ListBoxItem).Template.FindName(
   
     "
   
     cbPublic
   
     "
   
     , ListBoxView.Items[i] 
   
     as
   
      ListBoxItem);
  
    

对应着xaml:

  
    

   
     1 
   
     <
   
     ContentControl
   
     >
   
     

   
     2 
   
      
   
     <
   
     Grid
   
     >
   
     

   
     3 
   
      
   
     <
   
     CheckBox 
   
     Name
   
     ="cbSelect"
   
      Margin
   
     ="2,0,0,0"
   
      VerticalAlignment
   
     ="Center"
   
      IsChecked
   
     ="
   
     {Binding IsSelected, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}
   
     "
   
      <ContentPresenter Margin
   
     ="2"
   
     />
   
     

   
     4 
   
     5 
   
      　 
   
     <
   
     TextBlock 
   
     Width
   
     ="80"
   
      Name
   
     ="textblackConnPointNum"
   
      TextAlignment
   
     ="Center"
   
      Text
   
     ="
   
     {Binding Path=ConnPointNum}
   
     "
   
     />
   
     

   
     6　　  
   
      
   
     <
   
     TextBlock 
   
     Width
   
     ="150"
   
      Name
   
     ="textblackConnPointName"
   
      Text
   
     ="
   
     {Binding Path=ConnPointName}
   
     "
   
      TextAlignment
   
     ="Center"
   
     />
   
     

   
     7 
   
     ...... 

   
     8  
   
      
   
     </
   
     Grid
   
     >
   
     

   
     9 
   
     </
   
     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 { });

        }