WPF的Treeview子节点绑定

做法使用HierarchicalDataTemplate 更改DataType。当前ViewModel下有个ObservableCollection类型的EcgProjectList，于是一级节点都是EcgProject类型，EcgProject下有个ObservableCollection类型的Sheets，于是二级节点是EcgSheet类型。如果还想要三级节点，就在EcgSheet下定义一个T的集合X，然后前端 加个ItemsSource绑定X。然后再加个HierarchicalDataTemplate，DataType为T。第四第五等等以此类推。

<TreeView x:Name="treeView" ItemsSource="{Binding EcgProjectList}" Cursor="Hand" Background="{DynamicResource ProjectListColor}" BorderThickness="0,0,0,1" Margin="5,79,10,0" MouseLeftButtonUp="treeView_MouseLeftButtonDown" SelectedItemChanged="Sheet_SelectedItemChanged" Height="282" VerticalAlignment="Top">
    <TreeView.Resources>
        <HierarchicalDataTemplate  DataType="{x:Type Model:EcgProject}" ItemsSource="{Binding Sheets, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" >
            <StackPanel Orientation="Horizontal" Margin="0,2,0,2">
                <TextBlock FontSize="14" Height="20" VerticalAlignment="Center" Foreground="White" Text="{Binding Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ToolTip="{Binding Name, Mode=TwoWay}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="{x:Type Model:EcgSheet}">
            <StackPanel Orientation="Horizontal">
                <TextBlock FontSize="14" Height="20" VerticalAlignment="Center" Foreground="White"  Text="{Binding Name, Mode=OneTime}" ToolTip="{Binding Name, Mode=TwoWay}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
    </TreeView.Resources>
    <TreeView.ContextMenu>
        <ContextMenu>
            <MenuItem  Header="删除" IsCheckable="True" x:Name="DeleteTreeViewNode" Click="DeleteTreeViewNode_Click">
        </ContextMenu>
    </TreeView.ContextMenu>
</TreeView>

上述代码还写了treeview的菜单栏的相关代码