更改DataTemplate中存在的TextBlock文本 [英] Change the TextBlock Text present in a DataTemplate

问题描述

我有一个DataTemplate，其中我有一个带有2个RowDefinitions的Grid布局。我在第一行有一个TextBox，在第二行有一个ComboBox。 
 
我在ResourceDictionary中定义了DataTemplate。 
 
这是DataTemplate的代码：
 
 <   DataTemplate     x：Key   =  myDataTemplate >  
 <  网格 >  
 < ;   Grid.RowDefinitions  >  
 <   RowDefinition     /  >  
 <   RowDefinition     /  >  
 <   / Grid.RowDefinitions  >  
 <   TextBox    名称    =  txtChannelDescription    Grid.Row   =  0   保证金  =  1,1,1,1  /  > ;  
 <   ComboBox    名称  = < span class =code-keyword> cmbChannelTag    Grid.Row   =  1    IsReadOnly   =  True   保证金  =  1,1,1， 1  /  >  
 <   / Grid  >  
 <   / DataTemplate  >  
 
 I我正在使用代码后面的DataTemplate是：
（DataTemplate）FindResource（myDataTemplate）
 
如何在运行时设置TextBox.Text的值和ComboBox的ItemSource？

解决方案

嘿Abhishek，看看我做了什么，



1）首先，我在Xaml中使用了一个ListBox，并像这样分配了它的ItemTemplate属性 -

< listbox name =ItemListitemtemplate ={StaticResource myDataTemplate}/> 

2）在代码背后我编写了类似这样的代码 -

列表< string> Items =  new  List< string>（）; 
  public  MainWindow（）
 {
 
 InitializeComponent（）; 
 
 
 Items.Add（  Abc）; 
 ItemList.ItemsSource = Items; 
 
 ItemList.SelectionChanged + = ItemList_SelectionChanged; 
} 
 
 
  void  ItemList_SelectionChanged（ object  sender ，SelectionChangedEventArgs e）
 {
 ListBoxItem myListBoxItem =（ListBoxItem）（ItemList.ItemContainerGenerator.ContainerFromItem（ItemList.SelectedItem））; 
 ContentPresenter myContentPresenter = FindVisualChild< contentpresenter>（myListBoxItem）; 
 
  //  从ContentPresenter上设置的DataTemplate中查找textBlock  
 DataTemplate myDataTemplate = myContentPresenter.ContentTemplate; 
 TextBox myTextBlock =（TextBox）myDataTemplate.FindName（  txtChannelDescription，myContentPresenter）; 
 
  if （myTextBlock！=  null ）
 {
 myTextBlock.Text =  在此处输入文字; 
} 
} 
 
 
 私人 childItem FindVisualChild< childitem>（DependencyObject obj）其中 childItem：DependencyObject 
 {
  for （ int  i =  0 ; i <  VisualTreeHelper.GetChildrenCount（obj）; i ++）
 {
 DependencyObject child = VisualTreeHelper.GetChild（obj，i）; 
  if （child！=  null && child 是 childItem）
  return （childItem）child; 
  else  
 {
 childItem childOfChild = FindVisualChild< childitem>（child）; 
  if （childOfChild！=  null ）
 返回 childOfChild; 
} 
} 
 返回  null ; 
} 
 

所以通过这种方式使用datatemplate的FindNameAPI，你可以找到孩子组件>

I have a DataTemplate in which I have a Grid layout with 2 RowDefinitions. I have a TextBox in the first row and a ComboBox in the second row.

I have defined the DataTemplate in my ResourceDictionary.

This is the code for the DataTemplate:

<DataTemplate x:Key="myDataTemplate">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition />
            <RowDefinition />
        </Grid.RowDefinitions>
        <TextBox Name ="txtChannelDescription" Grid.Row="0" Margin="1,1,1,1"/>
        <ComboBox Name="cmbChannelTag" Grid.Row="1" IsReadOnly="True" Margin="1,1,1,1"/>
    </Grid>
</DataTemplate>

I am using this DataTemplate in code behind as:
(DataTemplate)FindResource("myDataTemplate")

How do I set the Value of TextBox.Text and the ItemSource of the ComboBox at runtime?

解决方案

Hey Abhishek, Just look at here what I did,

1) First of all I took one ListBox in Xaml and assign its ItemTemplate property like this -

<listbox name="ItemList" itemtemplate="{StaticResource myDataTemplate}" />

2)In code behind I wrote code something like this-

List<string> Items = new List<string>();
 public MainWindow()
    {

           InitializeComponent();


           Items.Add("Abc");
           ItemList.ItemsSource = Items;

           ItemList.SelectionChanged += ItemList_SelectionChanged;
       }


void ItemList_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {
           ListBoxItem myListBoxItem = (ListBoxItem)(ItemList.ItemContainerGenerator.ContainerFromItem(ItemList.SelectedItem));
           ContentPresenter myContentPresenter = FindVisualChild<contentpresenter>(myListBoxItem);

           // Finding textBlock from the DataTemplate that is set on that ContentPresenter
           DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;
           TextBox myTextBlock = (TextBox)myDataTemplate.FindName("txtChannelDescription", myContentPresenter);

           if(myTextBlock != null)
           {
               myTextBlock.Text = "Enter Your Text Here";
           }
       }


 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;
       }

So In this way by using "FindName" API of datatemplate, you can find the child element>

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