定义为DataTemplate中的控件，无法直接通过x:Name的索引方式来获取，因此必须另想办法。
在.net库中有一个VisualTreeHelper类，是专用于涉及可视化树的节点的操作用途。既然控件也存在于可视化树中，也可以使用这种方式来查找节点。
貌似还有一种方法，在DataTemplate中有LoadContent的方式，也可以获取其中的根元素。但我试了几遍，没什么反应，只好暂时作罢。下次再找原因。
下面是一个实例代码。
(1)首先是ListBox的数据源类示例：
public class FileBrowserDataSource : INotifyPropertyChanged{#region Data Membersprivate string m_FileName;public string FileName{get{return m_FileName;}set{if (value != m_FileName){m_FileName = value;NotifyPropertyChanged("FileName");}}}private string m_CreateDate;public string CreateDate{get{return m_CreateDate;}set{if (value != m_CreateDate){m_CreateDate = value;NotifyPropertyChanged("CreateDate");}}}#endregion#region Constructorpublic FileBrowserDataSource(string fileName, string date){FileName = fileName;CreateDate = date;}#endregion#region Event Handlerpublic event PropertyChangedEventHandler PropertyChanged;private void NotifyPropertyChanged(String propertyName){PropertyChangedEventHandler handler = PropertyChanged;if (null != handler){handler(this, new PropertyChangedEventArgs(propertyName));}}#endregion}(2)接着是在一个页面xaml中定义了ListPicker和一个用于测试的button：<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0" Height="400" Background="CadetBlue"><Grid.RowDefinitions><RowDefinition Height="Auto"/><RowDefinition Height="*"/></Grid.RowDefinitions><ListBox x:Name="FileListBox" Grid.Row="0"ItemsSource="{Binding}"Height="200"><ListBox.ItemTemplate><DataTemplate><StackPanel Orientation="Horizontal"><CheckBox Content="{Binding FileName}" VerticalAlignment="Center"/><TextBlock Margin="20 0 0 0" Text="{Binding CreateDate}" VerticalAlignment="Center"/></StackPanel></DataTemplate></ListBox.ItemTemplate></ListBox><Button Click="OnButtonClick" Content="Count Selected Files" Grid.Row="1" Height="80" Background="Chartreuse"/></Grid>(3)最后是ListPicer的后台代码： public partial class TestListPicker : PhoneApplicationPage{public TestListPicker(){InitializeComponent();List<FileBrowserDataSource> list = new List<FileBrowserDataSource>();list.Add(new FileBrowserDataSource("headFile","20120924"));list.Add(new FileBrowserDataSource("midFile", "20120925"));list.Add(new FileBrowserDataSource("tailFile", "20120925"));FileListBox.ItemsSource = list;}private void OnButtonClick(object sender, EventArgs e){string selectedFiles = string.Empty;for (int i = 0; i < this.FileListBox.Items.Count; i++){ListBoxItem item = this.FileListBox.ItemContainerGenerator.ContainerFromIndex(i) as ListBoxItem;TextBlock txtBlock = SearchVisualTree<TextBlock>(item);CheckBox chkBox = SearchVisualTree<CheckBox>(item);if (chkBox.IsChecked == true){selectedFiles += (txtBlock.Text.ToString() + " ");}}if (selectedFiles != string.Empty){selectedFiles = "files selected: " + selectedFiles;MessageBox.Show(selectedFiles);}else{MessageBox.Show("No file Selected");}}private T SearchVisualTree<T>(DependencyObject tarElem) where T:DependencyObject{var count = VisualTreeHelper.GetChildrenCount(tarElem);if (count == 0)return null;for (int i = 0; i < count; ++i){var child = VisualTreeHelper.GetChild(tarElem, i);if (child != null && child is T){return (T)child;}else{var res = SearchVisualTree<T>(child);if (res != null){return res;}}}return null;}}
(4)运行效果：
最后还有一个问题没有解决，就是在后台代码中我想动态设置空间的Binding数据源(通过SetBinding方法)，但是失败了，暂时头脑有点乱。迟点再解决吧。有高手在这里的话麻烦指教一下，不胜荣幸。
，片的时光如浮云般流过，我们的青春单薄的穿梭在蓝天之上。
