TreeView 数据绑定及选中命令处理

昨天接近下班，一个群里面的网友，问treeView绑定后选中命令怎么来处理，怎么没有效果，而且用MVVM的方式来写；快下班了本来想远程帮他看下，结果就说写个Demo给他看；再加上选中传参；

下面分享下代码：

 1 <TreeView Height="264" x:Name="tvProperties"  Width="220" ItemsSource="{Binding MyProperty}"><!--数据源-->
 2             <i:Interaction.Triggers>
 3                 <i:EventTrigger EventName="SelectedItemChanged">
 4                     <i:InvokeCommandAction Command="{Binding DataContext.SelectComamnd,
 5                             RelativeSource={RelativeSource AncestorType=Window, AncestorLevel=1,  Mode=FindAncestor}}" CommandParameter="{Binding SelectedItem, ElementName=tvProperties}"/><!--选中传值-->
 6                 </i:EventTrigger>
 7             </i:Interaction.Triggers>
 8             <TreeView.ItemContainerStyle>
 9                 <Style TargetType="{x:Type TreeViewItem}">
10                     <Setter Property="IsExpanded" Value="{Binding IsExpanded}"></Setter>
11                 </Style>
12             </TreeView.ItemContainerStyle>
13             <TreeView.ItemTemplate>
14 
15                 <HierarchicalDataTemplate  ItemsSource="{Binding Path=Children}"><!--节点-->
16 
17                     <StackPanel Orientation="Horizontal">
18 
19                         <Image VerticalAlignment="Center" Source="{Binding Icon}" Width="16" Height="16" Margin="0,0,2,2"></Image><!--绑定值-->
20 
21                         <TextBlock VerticalAlignment="Center" Name="nodeName" Text="{Binding Name}"></TextBlock>
22 
23                         <Image VerticalAlignment="Center" Source="{Binding EditIcon}" Margin="2,0,0,0"></Image>
24 
25                         <StackPanel.ToolTip>
26 
27                             <TextBlock VerticalAlignment="Center" Text="{Binding Name}" TextWrapping="Wrap" MaxWidth="200" ></TextBlock>
28 
29                         </StackPanel.ToolTip>
30 
31                     </StackPanel>
32 
33                 </HierarchicalDataTemplate>
34 
35             </TreeView.ItemTemplate>
36           
37         </TreeView>

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