<TreeView x:Name="tvFileStruct"  HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch" Margin="0,0,3,0" MinWidth="16" SelectedItemChanged="tvFileStruct_SelectedItemChanged">
                                    <TreeView.ItemTemplate>
                                        <HierarchicalDataTemplate DataType="{x:Type models:PropertyNodeItem}" ItemsSource="{Binding Path=Children}">
                                            <StackPanel Orientation="Horizontal" x:Name="spTreeNode">
                                                <Image VerticalAlignment="Center" Source="{Binding Icon}" Width="16" Height="16" Margin="0,0,2,2"></Image>
                                                <TextBlock VerticalAlignment="Center" Text="{Binding Name}"></TextBlock>
                                                <StackPanel.ToolTip>
                                                    <TextBlock VerticalAlignment="Center" Text="{Binding Name}" TextWrapping="Wrap" MaxWidth="200" ></TextBlock>
                                                </StackPanel.ToolTip>
                                            </StackPanel>
                                            <HierarchicalDataTemplate.Triggers>
                                                <DataTrigger Binding="{Binding IsGroup}" Value="False">
                                                    <Setter TargetName="spTreeNode" Property="ContextMenu" Value="{StaticResource TreeViewItemContextMenu}" />
                                                </DataTrigger>
                                            </HierarchicalDataTemplate.Triggers>
                                        </HierarchicalDataTemplate>
                                    </TreeView.ItemTemplate>
                                </TreeView>

 private void tvFileStruct_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
            PropertyNodeItem newItem = e.NewValue as PropertyNodeItem;
            PropertyNodeItem oldItem = e.OldValue as PropertyNodeItem;

            txtOldItem.Text = String.Format("'{0}'", oldItem == null ? string.Empty : oldItem.Name);
            txtNewItem.Text = String.Format("'{0}'", newItem == null ? string.Empty : newItem.Name);
if (newItem != null && !newItem.IsGroup && newItem.ArticleId > 0)
                    {
                        ShowDocument(newItem.ArticleId.ToString());//加载并显示文件                        
                    }
        }