将TreeView控件数据绑定到视图模型 [英] DataBinding a TreeView Control to a View Model

问题描述

大家好，

我是整个WPF领域的新手，如果有人可以向我解释一些事情，我将非常感激.我有一个绑定到视图模型对象的树视图.只需填充树形视图即可.我遇到问题的地方是何时将数据保存在表单上，​​并且树形视图刷新".如果用户具有展开的树视图的特定节点，则当树视图刷新"时，该节点折叠.保存后.

我将视图模型对象放在适当的位置，以便可以向其添加IsExpanded属性，然后在节点上进行两种方式绑定，以便在树视图刷新时该节点保持扩展状态.当前它不起作用，我认为为什么不能正确地对IsExpanded属性进行数据绑定.

这里是有问题的XAML:

Hello All,

I'm sort of new to the whole WPF scene and would be most thankful if someone could explain something to me.  I have a treeview that is bound to a view model object.  The treeview is populated just fine.  Where I'm running into a problem is when I save the data on the form and the treeview "refreshes".  If the user has a particular node of the treeview expanded that node collapses when the treeview "refreshes" upon a save.

I put the view model object in place so I could add an IsExpanded property to it and then do a two way bind on the node so that the node would stay expanded when the treeview refreshes.  It currently doesn't work and I think the reason why is I am not databinding the IsExpanded property properly.

Here is the XAML in question:

<TreeView Name="trvModules" Grid.Column="0" DataContext="{Binding Source = {StaticResource UserModuleList}}" ItemsSource="{Binding Path=Model}">

	<TreeView.ItemTemplate>

		<HierarchicalDataTemplate ItemsSource="{Binding UserModules}"> 

			<StackPanel Orientation="Horizontal">

				<CheckBox Margin="1,1,5,1"

						  IsChecked="{Binding Path=HasModuleAccess, Converter={StaticResource IdentityConverter}, Mode=TwoWay}"

						  Checked="chkModules_Checked"

						  Name="chkModules" />

				<TextBlock Style="{DynamicResource TextBlock_MouseOverTrigger_Style}"

						   Text="{Binding Path=DisplayName}"

						   ToolTip="{Binding Path=ModuleDescription}">

				</TextBlock>

			</StackPanel>

		 </HierarchicalDataTemplate>

	</TreeView.ItemTemplate>

	<TreeView.ItemContainerStyle>

		<Style TargetType="{x:Type TreeViewItem}">

			<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />

		</Style>

	</TreeView.ItemContainerStyle>

</TreeView>

推荐答案

凯文，您好，

您能在一个简单的项目中重现您的问题并将其发送给我吗?我的电子邮件地址是microsoft dot com上的v-lliu. />论坛中的MSDN订户支持
如果您对我们的支持有任何反馈意见，请联系 [e-mail]

Hi Kevin,

Could you please reproduce your problem in a simple project and send it to me? My email address is v-lliu at microsoft dot com.

I look forward to your reply!

Sincerely,
Linda Liu

MSDN Subscriber Support in Forum 
If you have any feedback on our support, please contact [e-mail]

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