<ListBox x:Name="FirstListBox" ItemsSource="{Binding mFriends}"  Margin="0,-6,-12,0" Height="541"><ListBox.ItemTemplate><DataTemplate><Border x:Name="borderListBox" Margin="5" CornerRadius="3"><StackPanel Orientation="Horizontal"><Image Height="80" Margin="20" Width="80" Source="{Binding Image_Url}"></Image><StackPanel><StackPanel Orientation="Horizontal"><TextBlock Margin="0,10,0,0" Text="{Binding Name}" FontFamily="/Fonts/YGY20070701.ttf#叶根友钢笔行书简体" Foreground="{StaticResource UseNameUnSelectedBrush}" TextWrapping="Wrap" FontSize="28"/><Image Name="VipImage" Source="{Binding Vip}" Width="32" Height="32"></Image></StackPanel><TextBlock Width="328" Text="{Binding message}" Foreground="Black" TextWrapping="Wrap"/></StackPanel> </StackPanel></Border></DataTemplate></ListBox.ItemTemplate></ListBox>

privatevoid SearchVisualTree(DependencyObject targetElement)         {            var count = VisualTreeHelper.GetChildrenCount(targetElement); if (count ==0)     return; for (int i =0; i < count; i++)                {                     var child = VisualTreeHelper.GetChild(targetElement, i);if (child is StackPanel)                     {                        StackPanel targetItem = (StackPanel)child;                         var back = Application.Current.Resources["PhoneBackgroundColor"].ToString();if (back =="#FF000000")                         {                             targetItem.Background =new SolidColorBrush(Color.FromArgb(255, 34, 34, 34));                          }else                         {                             targetItem.Background =new SolidColorBrush(Color.FromArgb(170, 255, 255, 255));                         }

                    }else                    {                         SearchVisualTree(child);                     }                }        }