获取ListBox的ItemTemplate绑定的控件

【转载 http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/a01eb1d5-cfc1-47fc-a8e5-45f7f02e8119】

How do I programmatically find a control inside an itemtemplates datatemplate, e.g. how do I find the checkbox inside the following XAML from the codebehind file..

<ListBox.ItemTemplate>
            <DataTemplate>

                    <CheckBox x:Name="KontoFeltCheckBox"
                              Checked="KontoFeltCheckBox_Checked"
                              ></CheckBox>

            </DataTemplate>
</ListBox.ItemTemplate>

 

You could walk the ListBoxItem Visual-Tree to find it’s ContentPresenter, and then find CheckBox from ContentPresenter’s ContentTemplate.  Please see example below:

Markup:
<Window x:Class="FindControlInsideDataTemplate.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
<StackPanel>
        <ListBox Name="myListBox" ItemsSource="{Binding}" >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <CheckBox x:Name="KontoFeltCheckBox" Checked="KontoFeltCheckBox_Checked">
                    </CheckBox>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <Button Content="Test" Click="Button_Click"/>
    </StackPanel>
</Window>

Code:
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace FindControlInsideDataTemplate
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            DataContext = new List<Person>()
            {
                new Person(){Name = "Tom"},
                new Person(){Name = "Ken"},
                new Person(){Name = "Peter"}
            };
        }

        private void KontoFeltCheckBox_Checked(object sender, RoutedEventArgs e)
        {

        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            ListBoxItem myListBoxItem = (ListBoxItem)(myListBox.ItemContainerGenerator.ContainerFromIndex(0));
            ContentPresenter myContentPresenter = FindVisualChild<ContentPresenter>(myListBoxItem);
            DataTemplate myDataTemplate = myContentPresenter.ContentTemplate;
            CheckBox target = (CheckBox)myDataTemplate.FindName("KontoFeltCheckBox", myContentPresenter);
        }
        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;
        }
    }
    public class Person
    {
        public string Name { set; get; }
    }
}