0
我想在設計時獲取示例數據以顯示在我的Treeview中。我的Treeview包含嵌套的Treeviews和CollectionViewSource。設計時樹視圖與CollectionViewSources組和HierarchicalDataTemplate的綁定
我想知道如何讓嵌套的TreeView顯示（只顯示當前3個節點中的第一個顯示）。
關於樹形
這是我到目前爲止已經想通了：
我的樹視圖包含分層數據（對象國（如 「就緒」）>日期（即「8/8/。
- ObjectTreeviewViewModel（一ObservableColle：16" ）>名稱（即 「蘋果」），但我只能得到一個
TreeView所後盾ction）
- CollectionViewSource到組由StateDisplay（+分選）
- 另一個CollectionViewSource到組由ObjectDateDisplay
現狀
的ObjectTreeview僅示出了在設計時節點中的一個電平的時候，我期待3級節點。
我的堆疊
我在.NET 4.5構建一個WPF應用程序，使用Visual Studio 2015年
代碼
XAML
<UserControl x:Class="myproject.app.views.MainWindow.ObjectTreeview"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300"
DataContext="{Binding RelativeSource={RelativeSource Self}}"
>
<UserControl.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="../../resources/MainWindow/ObjectTreeviewResources.xaml"></ResourceDictionary>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</UserControl.Resources>
<TreeView x:Name="Treeview"
ItemsSource="{Binding Source={StaticResource ObjectStateCollectionViewSource}, Path=Groups}"
ItemTemplate="{Binding Source={StaticResource ObjectStateTemplate}}">
</TreeView>
</UserControl>
XAML資源
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:componentModel="clr-namespace:System.ComponentModel;assembly=WindowsBase"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:pf="clr-namespace:System.ComponentModel;assembly=PresentationFramework"
xmlns:mainWindow="clr-namespace:myproject.app.viewmodels.MainWindow"
mc:Ignorable="d">
<!-- I.e. Level-3 Node (i.e. Leaf nodes) -->
<DataTemplate x:Key="ObjectTreeviewNode">
<TextBlock Text="{Binding ObjectNameDisplay}"/>
</DataTemplate>
<!-- Initial Grouping: Group by object states -->
<CollectionViewSource x:Key="ObjectStateCollectionViewSource"
Source="{Binding Path=ObjectTreeviewViewModel.TreeviewCollection}"
d:DesignSource="{d:DesignData Source=ObjectTreeviewDesignTimeData.xaml}"
>
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="StateDisplay"/>
</CollectionViewSource.GroupDescriptions>
<CollectionViewSource.SortDescriptions>
<componentModel:SortDescription PropertyName="StateEnum" />
<componentModel:SortDescription PropertyName="ObjectDate" />
<componentModel:SortDescription PropertyName="ObjectNameDisplay" />
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
<!-- I.e. Level-2 Node (i.e. mid-nodes) -->
<HierarchicalDataTemplate x:Key="ObjectDateTemplate">
<TreeView BorderThickness="0">
<TreeViewItem Header="{Binding Path=Name}"
ItemsSource="{Binding Path=Items}"
d:DataContext="{Binding Path=Items}"
ItemTemplate="{StaticResource ResourceKey=ObjectTreeviewNode}"
IsExpanded="True"/>
</TreeView>
</HierarchicalDataTemplate>
<!-- I.e. Level-1 Node (i.e. Root nodes) -->
<HierarchicalDataTemplate x:Key="ObjectStateTemplate" >
<TreeView BorderThickness="0">
<TreeView.Resources>
<!-- Sub-grouping: Group by object dates (This needs to be nested in this Treeview.Resources) -->
<CollectionViewSource x:Key="ObjectDateCollectionViewSource"
Source="{Binding Path=Items}"
d:DesignSource="{Binding Path=Items}"
>
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="ObjectDateDisplay"/>
</CollectionViewSource.GroupDescriptions>
</CollectionViewSource>
<!-- [This and all children] Hide the light-grey inactive background -->
<SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="Transparent" />
</TreeView.Resources>
<TreeViewItem Header="{Binding Path=Name}"
ItemsSource="{Binding Source={StaticResource ObjectDateCollectionViewSource}, Path=Groups}"
ItemTemplate="{StaticResource ObjectDateTemplate}"
IsExpanded="True"/>
</TreeView>
</HierarchicalDataTemplate>
</ResourceDictionary>
代碼隱藏
using System.Windows.Controls;
using myproject.app.viewmodels.MainWindow;
using myproject.lib.enumerations;
namespace myproject.app.views.MainWindow
{
/// <summary>
/// Interaction logic for ObjectTreeview.xaml
/// </summary>
public partial class ObjectTreeview : UserControl
{
public ObjectTreeviewViewModel ObjectTreeviewViewModel { get; private set; } = new ObjectTreeviewViewModel(); // this is a ObservableCollection<ObjectViewModel>
public ObjectTreeview()
{
InitializeComponent();
}
/// <summary>
/// Load object for an objectStateGroup (a set of ObjectStates) into the collection that backs the treeview.
/// </summary>
/// <param name="objectStateGroup">The objectStateGroupsEnum to load.</param>
public void LoadObjectStateGroup(objectStateGroupsEnum objectStateGroup)
{
ObjectTreeviewViewModel.LoadobjectStateGroup(objectStateGroup);
}
}
}