wpf 数据绑定到 XAML 中的 TreeView
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Databinding to TreeView in XAML
提问by Konrad Morawski
I am trying to use WPF databinding features to get a TreeViewto display a hierarchical tree of objects (categories).
我正在尝试使用 WPF 数据绑定功能来TreeView显示对象（类别）的分层树。
I have roughly followed this tutorial by Josh Smith, but to no effect: no items appear in my TreeView.
我大致遵循了 Josh Smith 的本教程，但没有效果：我的TreeView.
Here's complete code of my extremely simple application:
这是我极其简单的应用程序的完整代码：
using System.Windows;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = CategoriesTreeViewModel.CreateDefault;
}
}
}
ViewModel objects and sample data:
ViewModel 对象和示例数据：
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace WpfApplication1
{
public class Category
{
public Category()
{
Children = new ObservableCollection<Category>();
}
public ObservableCollection<Category> Children
{
get;
set;
}
public string Name { get; set; }
}
public class CategoriesTreeViewModel
{
public ReadOnlyCollection<Category> FirstGeneration;
private static IEnumerable<Category> SomeCategories
{
get
{
var A = new Category() { Name = "A" };
var B = new Category() { Name = "B" };
var A1 = new Category() { Name = "A1" };
var A2 = new Category() { Name = "A2" };
var B1 = new Category() { Name = "B1" };
var B2 = new Category() { Name = "B2" };
A.Children.Add(A1);
A.Children.Add(A2);
B.Children.Add(B1);
B.Children.Add(B2);
yield return A;
yield return B;
}
}
public static CategoriesTreeViewModel CreateDefault
{
get
{
var result = new CategoriesTreeViewModel()
{
FirstGeneration = new ReadOnlyCollection<Category>(SomeCategories.ToList())
};
return result;
}
}
}
}
And XAML:
和 XAML：
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TreeView ItemsSource="{Binding FirstGeneration}" Name="treeView1">
<TreeView.ItemTemplate>
<HierarchicalDataTemplate ItemsSource="{Binding Children}">
<TextBlock Text="{Binding Name}" />
</HierarchicalDataTemplate>
</TreeView.ItemTemplate>
</TreeView>
</Grid>
</Window>
Why is the TreeViewcontrol blank?
为什么TreeView控件是空白的？
回答by Thelonias
You have no way of accessing your FirstGeneration property. A property without a "get" accessor is considered write-only.
您无法访问您的 FirstGeneration 属性。没有“get”访问器的属性被认为是只写的。
public ReadOnlyCollection<Category> FirstGeneration { get; set; }
