设置itemcontrol的item点击前后不同状态

转自：http://www.cnblogs.com/linzheng/p/3764300.html

<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;

            }

        }

在这里还要注意一点的是，如果使用的时ListBox控件而不是ItemsControl控件的时候，在获取ContentPresenter对象的时候需要通过可视化树去查找。代码的实现如下所示：

        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;

        }

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设置itemcontrol的item点击前后不同状态

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