如何访问作为TreeItem的Datatemplate的编辑框 [英] How to access an edit box which is a Datatemplate of a TreeItem

问题描述

我有以下情况



有一个如下的DataTemplate

 <   DataTemplate     x：键  =  editableName >  
 <   TextBox     x：名称  =   hTreeRenameBox    /  < span class =code-keyword>>  
 <   / DataTemplate  >  

拥有如下树视图

<前lang =xml> < TreeView x：名称 = hScExTrview BorderBrush = Brown 背景 = ＃FF1E1E1E BorderThickness = 1 保证金 = 0，-1，-1,0 工具提示 = 会话脚本 >
< / TreeView >

现在我已经从Code为树视图创建了一些TreeItems。



我选择了一个点一个上下文菜单，它是树视图的一部分，我有下面的代码来添加DataTemplate与TreeView项目如下



TreeViewItem pp =（TreeViewItem）hScExTrview .SelectedItem;

String kk =（String）pp.Header;

pp.HeaderTemplate =（DataTemplate）this.Resources [editableName];



现在我的查询是我想获得在DataTemplate中声明的hTreeRenameBox。我如何从上面的C＃代码中获得它。



我使用下面的代码，但是它不起作用;请帮助纠正我！

TextBox textBoxAnswer = pp.HeaderTemplate.FindName（hTreeRenameBox，pp）as TextBox;

解决方案

您好Toufique。



您可以使用FrameworkTemplate的Find方法从模板中获取命名元素。



在你的情况下，你有一个问题，因为Header是由ContentPresenter代表的默认TreeViewItem ControlTemplate，如下所示：

 <   ContentPresenter     x：名称  =  PART_Header    ContentSource   = 标题    Horizo​​ntalAli gnment   =  {TemplateBinding Horizo​​ntalContentAlignment}    SnapsToDevicePixels   =  {TemplateBinding SnapsToDevicePixels}   /  >  

所以解决方案可以这样工作：

  //  获取TreeViewItem使用的HeaderTemplate  
 FrameworkTemplate ft = pp.HeaderTemplate; 
  //  获取模板应用的FrameworkElement  - 它是TreeViewItem模板中的ContentPresenter（如果你没有覆盖它..） 
 ContentPresenter presenterHeader = pp.Template.FindName（  PART_Header ，pp） as  ContentPresenter; 
  //  现在我们可以从应用它的FrameworkElement中找到模板的元素（ContentPresenter）  
 TextBox obj = ft.FindName（  hTreeRenameBox，presenterHeader）< span class =code-keyword> as  TextBox; 

亲切的问候约翰内斯



PS也许你的WPF项目尝试适当的MVVM模式实现，摆脱你的代码隐藏和这样的问题？

Hi,

I have below situation

Have a DataTemplate like below

<DataTemplate x:Key="editableName">
    <TextBox x:Name="hTreeRenameBox" />
</DataTemplate>

Have a treeview like below

<TreeView x:Name="hScExTrview" BorderBrush="Brown" Background="#FF1E1E1E" BorderThickness="1" Margin="0,-1,-1,0" ToolTip="Session Scripts">
</TreeView>

Now I have created some TreeItems for the treeview from Code.

One point I have selected one context menu which is part of the treeview and I have the below code to add the DataTemplate with TreeView Item like below

TreeViewItem pp = (TreeViewItem)hScExTrview.SelectedItem;
String kk = (String)pp.Header;
pp.HeaderTemplate = (DataTemplate)this.Resources["editableName"];

Now my query is I want to get "hTreeRenameBox" which is declared inside DataTemplate. How I can get that from the above C# code.

I used the below code but it is not working; kindly correct me!
TextBox textBoxAnswer = pp.HeaderTemplate.FindName("hTreeRenameBox",pp) as TextBox;

解决方案

Hi Toufique.

You could use FrameworkTemplate's Find method to get a named element from a template.

In your case you have a "Problem" because the Header is in the default TreeViewItem ControlTemplate represented by a ContentPresenter like this:

<ContentPresenter x:Name="PART_Header" ContentSource="Header" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>

So the solution could work like this:

// Get the HeaderTemplate used by the TreeViewItem
FrameworkTemplate ft = pp.HeaderTemplate;
// Get the FrameworkElement your Template is applied to - it's the ContentPresenter from your TreeViewItem Template (if you haven't overriden it..)
ContentPresenter presenterHeader = pp.Template.FindName("PART_Header", pp) as ContentPresenter;
// Now we can find the elements of the Template from the FrameworkElement it was applied to (the ContentPresenter)
TextBox obj = ft.FindName("hTreeRenameBox", presenterHeader ) as TextBox;

Kind regards Johannes

P.S. maybe try a proper MVVM pattern implementation with your WPF Project, and get rid of your code-behind and such "problems"?

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