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我嘗試使用瀏覽潛在循環分層數據的樹形視圖。 這意味着我不能嘗試一次加載所有的樹,因爲那時可能會出現無限循環。TreeView沒有AfterExpand事件?
我想向TreeView.AfterCollapse事件作出反應記錄here at MSDN
然而,我的控制似乎不具備此事件。如果我嘗試添加AfterExpand屬性,我收到以下錯誤消息:
error MC3072: The property 'AfterExpand' does not exist in XML namespace 'http://schemas.microsoft.com/winfx/2006/xaml/presentation'. Line 23 Position 21.
我在做什麼錯了?調用錯誤的命名空間? 下面是代碼:
<Window x:Class="MyApp.Edit.EditView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MyApp.Edit"
Title="{Binding WindowTitle,UpdateSourceTrigger=PropertyChanged}" MinHeight="350" MinWidth="350">
<Window.Resources>
<HierarchicalDataTemplate x:Key="sectionTemplate"
ItemsSource="{Binding ChildSections}"
DataType="{x:Type local:Section}">
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Label, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text=" - " />
<TextBlock Text="{Binding Description}" FontStyle="Italic" Foreground="#777" />
</StackPanel>
</HierarchicalDataTemplate>
</Window.Resources>
<StackPanel>
<TreeView ItemsSource="{Binding Sections}"
SelectedItemChanged="TreeView_SelectedItemChanged"
ItemTemplate="{StaticResource sectionTemplate}"
MinHeight="150"
MinWidth="300"
Name="treeView"
AfterExpand="MyEventHandler"
</TreeView>
<TextBox Text="{Binding Label, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
Margin="0 10 0 0"/>
<TextBox Text="{Binding Description, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
Margin="0 10 0 0"/>
<StackPanel Orientation="Horizontal">
<Button Content="Add Child" Click="Button_Click_AddChild" />
</StackPanel>
</StackPanel>
</Window>
我認爲它不適用於wpf。 –