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[英]Xaml inside ContentControl and binding to DependencyProperty
[英]Cannot form binding with ItemsControl inside ContentControl
在UWP應用中,我試圖將ListBox注入到Content Control中。 從您提交的代碼中您將看到,ListBox的ItemsSource綁定未向PropertyChanged事件注冊,因此當我嘗試將ItemsSource更改為新集合時,它不會在列表中直觀地反映出來。 我知道引用是正確的,因為如果在設置綁定之前先創建新集合,則屏幕將顯示該列表。 要使以下代碼正常工作,我需要做什么?
<Page
x:Class="App2.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App2"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<ContentControl Content="{x:Bind MyRootControl, Mode=OneWay}"/>
</Grid>
</Page>
和
using System.Collections.ObjectModel;
using System.ComponentModel;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Data;
namespace App2
{
public sealed partial class MainPage : Page, INotifyPropertyChanged
{
public MainPage()
{
this.InitializeComponent();
BindingOperations.SetBinding(MyRootControl, ItemsControl.ItemsSourceProperty, new Binding() { Source = myData, Mode = BindingMode.OneWay });
myData = new ObservableCollection<string>(new[] { "hello", "world" });
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(myData)));
}
public ObservableCollection<string> myData { get; set; } = new ObservableCollection<string>();
public ListBox MyRootControl { get; set; } = new ListBox();
public event PropertyChangedEventHandler PropertyChanged;
}
}
感謝@Clemens,這個答案值得稱贊。 綁定語法不正確。 它應該是
BindingOperations.SetBinding(MyRootControl, ItemsControl.ItemsSourceProperty, new Binding() { Source = this, Path= new PropertyPath("myData"), Mode = BindingMode.OneWay });
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