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[英]WPF TreeView: bindings not updating when TreeView is virtualizing
[英]WPF Bindings TreeView Issue with view
我只是试图将我的树形视图绑定到xaml中,但是由于某种原因,该列表似乎没有显示,所以我附上了代码。 任何帮助都会很棒。
非常感谢
class Item
{
public string Header { get; set; }
public List<string> TreeItems { get; set; }
public List<Item> SubItems { get; set; }
}
这是视图模型
public StoreLibraryViewModel()
{
this.DisplayName = "hierarchy Library";
TreeItems = new ObservableCollection<Item>();
string[] data = new string[]{
"Warwick","Birmingham",
};
Item item = new Item()
{
Header = "Region",
TreeItems = new List<string>(data)
};
TreeItems.Add(new Item()
{
Header = "Region 1",
SubItems = new List<Item>(new Item[] { item }),
TreeItems = new List<string>(data)
});
TreeItems.Add(new Item()
{
Header = "Region 2",
SubItems = new List<Item>(new Item[] { item }),
TreeItems = new List<string>(data)
});
TreeItems.Add(new Item()
{
Header = "Region 3",
SubItems = new List<Item>(new Item[] { item }),
TreeItems = new List<string>(data)
});
}
ObservableCollection<Item> TreeItems { get; set; }
这是XAML
TreeView ItemsSource="{Binding TreeItems}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding SubItems}">
<Expander Header="{Binding Header}">
<ItemsControl Margin="25,0,0,0" ItemsSource="{Binding TreeItems}" />
</Expander>
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
我似乎要显示的只是一个空的树视图,不胜感激。
非常感谢
您只需要在xaml代码中分配数据上下文,如下所示:
<Window ....
xmlns:local="clr-namespace:myStoreLibraryViewModelNameSpace"
....
/>
<Window.DataContext>
<local:StoreLibraryViewModel />
</Window.DataContext>
....
其中myStoreLibraryViewModelNameSpace是在StoreLibraryViewModel所在的命名空间
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