EventMemoryLeak/TimerPage.xaml

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<Page
    x:Class="EventMemoryLeak.TimerPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:EventMemoryLeak"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <TextBox x:Name="TextBoxTimer"></TextBox>
        <Button Click="Button_Click">Go back to main page</Button>

        <!--内存泄漏，因为Children集合没有继承INotifyCollectionChanged-->
        <TextBlock Text="{Binding ElementName=layoutRoot, Path=Children.Count}" />
        <!--不会内存泄漏，因为ActualWidth是依赖属性-->
        <TextBlock Text="{Binding ElementName=layoutRoot, Path=ActualWidth}" />
        <!--不会内存泄漏，因为Mode = OneTime-->
        <TextBlock Text="{Binding ElementName=layoutRoot, Path=Children.Count, Mode = OneTime}" />

    </StackPanel>
</Page>