WPF控件是否在其绑定中使用弱事件?

当我在WPF中使用数据绑定时,我的目标控件正在侦听绑定源上的事件。例如,我可能有一个 ListView CollectionChanged 事件 ObservableCollection

如果事件源的生存期预计将超过事件侦听器的生存期,则可能存在内存泄漏,并且 weak event pattern 应该使用。

WPF数据绑定是否遵循弱事件模式?如果我的 可观测集合 列表视图 ,我的

这就是为什么我怀疑WPF控件没有实现弱事件模式。如果他们这样做了,我希望两者都是 DerivedListView Collected! 和 DerivedTextBlock Collected! 是。

窗口1。xaml.cs公司

using System;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;

namespace LeakDetector
{
    public class DerivedListView : ListView
    {
        ~DerivedListView()
        {
            Console.WriteLine("DerivedListView Collected!");
        }
    }

    public class DerivedTextBlock : TextBlock
    {
        ~DerivedTextBlock()
        {
            Console.WriteLine("DerivedTextBlock Collected!");
        }
    }

    public partial class Window1 : Window
    {
        // The ListView will bind to this collection and listen for its
        // events. ObColl will hold a reference to the ListView.
        public ObservableCollection<int> ObColl { get; private set; }

        public Window1()
        {
            this.ObColl = new ObservableCollection<int>();
            InitializeComponent();

            // Trigger an event that DerivedListView should be listening for
            this.ObColl.Add(1);

            // Get rid of the DerivedListView
            this.ParentBorder.Child = new DerivedTextBlock();

            GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
            GC.WaitForPendingFinalizers();
            GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

            this.ParentBorder.Child = null;

            GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
            GC.WaitForPendingFinalizers();
            GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);

            Console.WriteLine("Done");
        }
    }
}

窗口1.xaml

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:LeakDetector"
    x:Class="LeakDetector.Window1"
    DataContext="{Binding RelativeSource={RelativeSource Self}}"
    Height="300" Width="300"
    Title="Leak Detector">
    <Border x:Name="ParentBorder">
        <local:DerivedListView ItemsSource="{Binding Path=ObColl}" />
    </Border>
</Window>