使用Silverlight Toolkit TreeView(树形控件)

public   class  ForumInfo
{
     public   int  ForumID {  get ;  set ; }
     public   int  ParendID {  get ;  set ; }
     public   string  ForumName {  get ;  set ; }
}

[ServiceContract(Namespace  =   "" )]
[AspNetCompatibilityRequirements(RequirementsMode  =  AspNetCompatibilityRequirementsMode.Allowed)]
public   class  DateService
{
 
    [OperationContract]
     public  List < ForumInfo >  GetForumData()
    {
        List < ForumInfo >  forumList  =   new  List < ForumInfo > ();
        forumList.Add( new  ForumInfo() { ForumID  =   1 , ParendID  =   0 , ForumName  =   " 笔记本版块 " });
        forumList.Add( new  ForumInfo() { ForumID  =   2 , ParendID  =   0 , ForumName  =   " 台式机版块 "  });

        forumList.Add( new  ForumInfo() { ForumID  =   3 , ParendID  =   1 , ForumName  =   " Dell笔记本 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   4 , ParendID  =   1 , ForumName  =   " IBM笔记本 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   5 , ParendID  =   4 , ForumName  =   " IBM-T系列 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   6 , ParendID  =   4 , ForumName  =   " IBM-R系列 "  });

        forumList.Add( new  ForumInfo() { ForumID  =   7 , ParendID  =   2 , ForumName  =   " 联想台式机 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   8 , ParendID  =   2 , ForumName  =   " 方正台式机 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   9 , ParendID  =   2 , ForumName  =   " HP台式机 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   10 , ParendID  =   7 , ForumName  =   " 联想家悦H系列 "  });
        forumList.Add( new  ForumInfo() { ForumID  =   11 , ParendID  =   7 , ForumName  =   " 联想IdeaCentre系列 "  });

         return  forumList;
    }
}

< controls:TreeView  x:Name ="TreeOfLife"  Margin ="5"  Grid.Column ="0"  Grid.Row ="1"   
          SelectedItemChanged ="TreeOfLife_SelectedItemChanged"   />

< Border  BorderBrush ="Gray"  BorderThickness ="1"  Padding ="8"  Margin ="8,0,0,0"  Grid.Row ="1"  Grid.Column ="1" >
     < StackPanel  x:Name ="DetailsPanel"  Margin ="4" >
         < StackPanel  Orientation ="Horizontal" >
             < TextBlock  Text ="版块ID: "  FontWeight ="Bold"    />
             < TextBlock  Text =" {Binding ForumID} "   />
         </ StackPanel >
         < StackPanel  Orientation ="Horizontal" >
             < TextBlock  Text ="版块名称: "  FontWeight ="Bold"    />
             < TextBlock  Text =" {Binding ForumName} "   />
         </ StackPanel >
         < StackPanel  Orientation ="Horizontal" >
             < TextBlock  Text ="版块信息: "  FontWeight ="Bold"   />
             < TextBlock  x:Name ="DetailText"  TextWrapping ="Wrap"  Text =" {Binding ForumName} " />
         </ StackPanel >
     </ StackPanel >
</ Border >

public   partial   class  Page : UserControl
{
     DateServiceClient dataServiceClient  =   new  DateServiceClient();

     ObservableCollection < ForumInfo >  forumList  =   new  ObservableCollection < ForumInfo > ();

      public  Page()
     {
         InitializeComponent();

          // 此样式只添加在根结点上
          // TreeOfLife.ItemContainerStyle = this.Resources["RedItemStyle"] as Style;
              
         dataServiceClient.GetForumDataCompleted += new  EventHandler < GetForumDataCompletedEventArgs > (dataServiceClient_GetForumDataCompleted);
         dataServiceClient.GetForumDataAsync();
     }

      void  dataServiceClient_GetForumDataCompleted( object  sender, GetForumDataCompletedEventArgs e)
     {
          try
         {
             forumList  =  e.Result;
             AddTreeNode( 0 ,  null );  
         }
          catch
         {
              throw   new  NotImplementedException();
         }
     }

      private   void  AddTreeNode( int  parentID, TreeViewItem treeViewItem)
     {
         List < ForumInfo >  result  =  (from forumInfo  in  forumList
                                    where  forumInfo.ParendID  ==  parentID
                                   select forumInfo).ToList < ForumInfo > ();

          if  (result.Count  >   0 )
         {
              foreach  (ForumInfo foruminfo  in  result)
             {
                 TreeViewItem objTreeNode  =   new  TreeViewItem();
                 objTreeNode.Header  =  foruminfo.ForumName;
                 objTreeNode.DataContext  =  foruminfo;

                  // 此样式将会添加的所有叶子结点上
                  // objTreeNode.ItemContainerStyle = this.Resources["RedItemStyle"] as Style;
 
                  // 添加根节点
                  if  (treeViewItem  ==   null )
                 {
                     TreeOfLife.Items.Add(objTreeNode);
                 }
                  else
                 {                    
                     treeViewItem.Items.Add(objTreeNode);
                 }
                 AddTreeNode(foruminfo.ForumID, objTreeNode);
             }
         }
     }


      private   void  TreeOfLife_SelectedItemChanged( object  sender, RoutedPropertyChangedEventArgs < object >  e)
     {
         TreeViewItem item  =  e.NewValue  as  TreeViewItem;
         ForumInfo fi  =  item.DataContext  as  ForumInfo;

         DetailsPanel.DataContext  =  fi;
     }
}

< UserControl.Resources >
         < Style  x:Key ="RedItemStyle"  TargetType ="controls:TreeViewItem" >
             < Setter  Property ="HeaderTemplate" >
                 < Setter.Value >
                     < DataTemplate >
                         < StackPanel  Orientation ="Horizontal" >
                             < CheckBox  />
                             < Image  Source ="image/default.png" />
                             < TextBlock  Text =" {Binding} "  Foreground ="Red"  FontStyle ="Italic"   />
                         </ StackPanel >
                     </ DataTemplate >
                 </ Setter.Value >
             </ Setter >
             < Setter  Property ="IsExpanded"  Value ="True"   />
         </ Style >
</ UserControl.Resources >

TreeOfLife.ItemContainerStyle  =   this .Resources[ " RedItemStyle " ]  as  Style; 

< controls:TreeView.ItemTemplate >
     < controls:HierarchicalDataTemplate  ItemsSource =" {Binding Subclasses} "
            ItemContainerStyle =" {StaticResource ExpandedItemStyle} " >
         < StackPanel >
             < TextBlock  Text =" {Binding Rank} "  FontSize ="8"  FontStyle ="Italic"  Foreground ="Gray"  Margin ="0 0 0 -5"   />
             < TextBlock  Text =" {Binding Classification} "   />
         </ StackPanel >
     </ controls:HierarchicalDataTemplate >
</ controls:TreeView.ItemTemplate >