如何释放ListView的源内存？

Question

我想立即释放 ListView 的 ItemsSource 引用，以防引用占用大量内存。

但是即使我的代码中没有任何引用，GC 也不会释放引用。例如，我希望使用下面的 'Free' 按钮释放 byte[]。

SimpleListView.xaml

<Window x:Class="PlayWPF.SimpleListView"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="SimpleListView" Height="450" Width="800">
  <DockPanel LastChildFill="True">
    <ListView Name="LvTest" Width="500" DockPanel.Dock="Left"/>
    <Button Content="Alloc" Click="AllocClick" Height="200" DockPanel.Dock="Top"/>
    <Button Content="Free" Click="FreeClick"/>
  </DockPanel>
</Window>

SimpleListView.xaml.cs

public partial class SimpleListView : Window {
  public SimpleListView() {
    InitializeComponent();
  }

  private void AllocClick(object sender, RoutedEventArgs e) {
    var list = new List<byte[]>();
    list.Add(new byte[100000000]);
    LvTest.ItemsSource = list;
  }

  private void FreeClick(object sender, RoutedEventArgs e) {
    LvTest.ItemsSource = null;
    //LvTest.ItemsSource = new List<int>();
    GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
    GC.WaitForPendingFinalizers();
  }
}

点击'Free'按钮没有区别，点击new List<int>()按钮会在二审时释放引用。即使我关闭 window.

，引用仍然存在

怎样才能顺利释放？

编辑： 它已被标记为可能与 Why Large Object Heap and why do we care? 重复，但在 .NET 4.7.1 上更改 LargeObjectHeapCompactionMode 无效。

我找到了解决方案，使用 ObservableCollection 而不是简单的 List 来回答原始问题，但我不知道这如何以及为什么会有所不同。出于左好奇心，我将这个问题悬而未决。

Answer 1

它是在当前删除的 blog post 上描述的。

The TextBlock control has a binding to an object (myGrid) that has a reference back to the TextBlock (it is one of myGrid children’s).
Note that this type of a DataBinding leak is unique to a specific scenario (and not to all DataBinding scenarios) as documented in the kb article. The property in the Path is a not a DependencyProperty and not on a class which implements INotifyPropertyChanged and in addition a chain of strong reverences must exist.

据此，我误用了数据绑定，正确的免费片段如下。

BindingOperations.ClearBinding(MyTextBlock, TextBlock.TextProperty);

如何释放ListView的源内存？

How can I release ListView's source memory?

c#

wpf

memory-leaks

.net-4.5