WPF（ MVVM）中TreeView 加载xml文档的方式及遇到的问题

有如下xml代码：

<?xml version="1.0" encoding="utf-8" ?>
<FileSystem xmlns="">
  <Folder Name="Books">
    <Folder Name="Programming">
      <Folder Name="Windows">
        <Folder Name="WPF"/>
        <Folder Name="MFC"/>
        <Folder Name="Delphi"/>
      </Folder>
    </Folder>
    <Folder Name="Tools">
      <Folder Name="Development"/>
      <Folder Name="Designment"/>
      <Folder Name="Players"/>
    </Folder>
    <Folder Name="Books1">
      <Folder Name="Development"/>
      <Folder Name="Designment"/>
      <Folder Name="Players"/>
    </Folder>
    <Folder Name="Books2">
      <Folder Name="Development"/>
      <Folder Name="Designment"/>
      <Folder Name="Players"/>
    </Folder>
    <Folder Name="Books3">
      <Folder Name="Development"/>
      <Folder Name="Designment"/>
      <Folder Name="Players"/>
    </Folder>
  </Folder>
</FileSystem>

实现加载的方式有：

1.在Xaml中定义一个静态的XmlDataProvider：如下：

 <UserControl.Resources>

    <XmlDataProvider x:Key="DicData"
               Source="../DesignData/report.xml"
               XPath="FileSystem/Folder" />

    <DataTemplate x:Key="dicItemTemplate">
        <Label Content="{Binding XPath=Name}"/>
    </DataTemplate>
</UserControl.Resources>

然后在TreeView ,ListBox等控件中使用：

<ListBox x:Name="DicListBox" Margin="60,12,114,64" DockPanel.Dock="Left"
             ItemsSource="{Binding 
         Source={StaticResource ReportData}}"

             ItemTemplate="{StaticResource teamItemTemplate}"
             IsSynchronizedWithCurrentItem="True"
             Visibility="Visible" SelectionMode="Single">
</ListBox>

这样子是没有问题能正常显示。

2.使用MVVM 数据绑定，直接加载xml文件

ViewModel中代码：

XmlDataProvider xmlDataProvider = new XmlDataProvider();
            xmlDataProvider.XPath = "FileSystem/Folder";
            XmlDocument xmlDocument = new XmlDocument();
            var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "DataContext\Setting\FileSystem.xml");
            xmlDocument.Load(path);
            xmlDataProvider.Document = xmlDocument;
            DicTypeData = xmlDataProvider;

Xaml代码：在Binding的时候需要按照（

DataContext="{Binding DicTypeData}" ItemsSource="{Binding}

）的方式，才能加载出来数据，否则加载不出来。

<TreeView Name="dicTypeTreeView" MinHeight="200" DataContext="{Binding DicTypeData}" ItemsSource="{Binding}">
                            <TreeView.ItemTemplate>
                                <HierarchicalDataTemplate ItemsSource="{Binding XPath=Folder}">
                                    <StackPanel Orientation="Horizontal" Margin="2">
                                        <Image Source="pack://application:,,,/Sv.App;component/Image/Project/lq.png" Width="16" Height="16" SnapsToDevicePixels="True"></Image>
                                        <TextBlock Text="{Binding XPath=@Name}" Margin="5,0"></TextBlock>
                                    </StackPanel>
                                </HierarchicalDataTemplate>
                            </TreeView.ItemTemplate>
                        </TreeView>

3.直接在资源中，构建XmlDataProvider数据

<XmlDataProvider x:Key="xdp" XPath="FileSystem/Folder">
            <x:XData>
                <FileSystem xmlns="">
                    <Folder Name="Books">
                        <Folder Name="Programming">
                            <Folder Name="Windows">
                                <Folder Name="WPF"/>
                                <Folder Name="MFC"/>
                                <Folder Name="Delphi"/>
                            </Folder>  
                        </Folder>
                        <Folder Name="Tools">
                            <Folder Name="Development"/>
                            <Folder Name="Designment"/>
                            <Folder Name="Players"/>
                        </Folder>
                    </Folder>
                </FileSystem>
            </x:XData>
        </XmlDataProvider>