设置itemcontrol的item点击前后不同状态

<Page.Resources>
<!--选中数据项的样式-->
<DataTemplate x:Key="dataTemplateSelectKey" x:Name="dataTemplateSelectName">
<Grid  Tapped="StackPanel_Tap_1" Background="Red">
<TextBlock Text="{Binding LastName}" FontSize="50" />
</Grid>
</DataTemplate>
<!--默认数据项的样式，注意默认的数据项样式不能在C#中再次调用-->
<DataTemplate x:Key="dataTemplateDefaultKey" x:Name="dataTemplateDefaultName">
<StackPanel Orientation="Horizontal" Tapped ="StackPanel_Tap_1" x:Name="sp">
<TextBlock Text="{Binding LastName}"/>
<TextBlock Text=", "/>
<TextBlock Text="{Binding FirstName}"/>
</StackPanel>
</DataTemplate>
<!--非选中数据项的样式-->
<DataTemplate x:Key="dataTemplateNoSelectKey" x:Name="dataTemplateNoSelectName">
<StackPanel Orientation="Horizontal" Tapped ="StackPanel_Tap_1">
<TextBlock Text="{Binding LastName}"/>
<TextBlock Text=", "/>
<TextBlock Text="{Binding FirstName}"/>
</StackPanel>
</DataTemplate>
</Page.Resources>

<StackPanel>
<ItemsControl  x:Name="listbox" ItemTemplate="{StaticResource dataTemplateDefaultKey }" ItemsSource="{Binding lstu}"/>
</StackPanel>

private void StackPanel_Tap_1(object sender, TappedRoutedEventArgs e)
{
student stu = (student)(sender as Panel).DataContext;
System.Diagnostics.Debug.WriteLine((sender as Panel).GetType().ToString());
System.Diagnostics.Debug.WriteLine(stu.LastName);
//sender是点击的item，sender as Panel获得该item内的容器对象，分别是StackPanel和Grid
// 然后从listbox里面获取到当前的ContentPresenter对象
ContentPresenter myContentPresenter = (ContentPresenter)(listbox.ContainerFromItem((sender as Panel).DataContext));
// 判断数据模板是选中状态的还是非选中状态的，然后进行赋值
if (myContentPresenter.ContentTemplate.Equals(dataTemplateSelectName))
{
//赋值非选中状态的模板
myContentPresenter.ContentTemplate = dataTemplateNoSelectName;
}
else
{
//赋值选中状态的模板
myContentPresenter.ContentTemplate = dataTemplateSelectName;
}
}

private void StackPanel_Tap_1(object sender, TappedRoutedEventArgs e)
{
var s=(sender as Panel).DataContext;
//System.Diagnostics.Debug.WriteLine((sender as Panel).GetType().ToString());
//System.Diagnostics.Debug.WriteLine(stu.LastName);
// 通过点击的控件的DataContext判断所绑定的数据对象
// 然后从listbox里面获取到当前的ContentPresenter对象
ListBoxItem myListBoxItem = (ListBoxItem)(listbox.ContainerFromItem((sender as Panel).DataContext));
// 判断数据模板是选中状态的还是非选中状态的，然后进行赋值
// 在ListBoxItem中查找ContentPresenter

ContentPresenter myContentPresenter=(ContentPresenter)FindVisualChild<ContentPresenter>(myListBoxItem);

if (myContentPresenter.ContentTemplate.Equals(dataTemplateSelectName))
{
//赋值非选中状态的模板
myContentPresenter.ContentTemplate = dataTemplateNoSelectName;
}
else
{
//赋值选中状态的模板
myContentPresenter.ContentTemplate = dataTemplateSelectName;
}

}

//查找可视化树某个类型的元素
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;
}