[Windows]Repeated navigation page crash #18441
Comments
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I don't think your issue has to do with Navigation. Your App UI (A CollectionView with bindable layouts embedded) is quite intense and, on my machine, uses around 700 MBs just opening it and fully screening it on the main page alone. Scrolling down will cause the same WinUI exception you're seeing by navigation. You're also navigating to the same page instance, but removing and adding your item source. So you're not navigating to anything; it's the same page. Looking at the debugger tooling (and turning off XAML Hot Reload) and scrolling through the list, it seems that Setter Specificity continually adds items to its list and doesn't remove them. For example, changing your app UI to <CollectionView SelectionMode="Single"
ItemsSource="{Binding ItemList}">
<CollectionView.ItemTemplate>
<DataTemplate x:DataType="local:Item">
<Grid RowSpacing="0"
RowDefinitions="Auto,1"
ColumnDefinitions="120,*,120,64">
<Label Text="{Binding Name}"
FontSize="24"
WidthRequest="120"
VerticalOptions="Center"
HorizontalTextAlignment="Center" />
</Grid>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>and scrolling through the list, 
The count and memory size seems to, generally, increase all the time. It could be that your app UI as designed, on top of possible memory issues with things like setter specificity, could be causing the problem. |
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@drasticactions 3Q ,yes!, Repeated Invoke Clear and Add can also cause crash |
XamlTest
added
s/verified
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Verified this on Visual Studio Enterprise 17.8.0 Preview 7.0(8.0.0-rc.2.9530). Repro on Windows 11 with below Project: |
jsuarezruiz
added
the
area-controls-collectionview
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Duplicate of #22790 |
github-project-automation
bot
moved this from Todo
to Done
in .NET 9 MAUI Performance, App Size, Inner Loop
### Description of Change
Fixes a long-standing crash when navigating pages:
1. Manually clear the `ContentPresenter.Content` property.
When navigating pages it was discovered that the `Content` property of
the `ContentPresenter` sometimes was not being detached from the parent
`ContentPresenter` (the `ContentPresenter` itself does detach from the
Page). A workaround for this was to manually clear the `Content`
property.
**The actual cause of this bug:** I suspect that something causing the
lifecycle tracking to be messed up. I'm still not sure what this is, but
for now this will help our customers more than nothing.
## Workaround
The following can be used as a workaround. Place it in the `Loaded`
event for your `AppShell`:
```csharp
private void AppShell_Loaded(object? sender, EventArgs e)
{
Loaded -= AppShell_Loaded;
#if WINDOWS
if (Handler != null && Handler.PlatformView is ShellView shellView &&
shellView.Content is MauiNavigationView nv &&
nv.Content is Microsoft.UI.Xaml.Controls.Frame frame)
{
frame.Navigating += (s, e) =>
{
if (frame.Content is Microsoft.UI.Xaml.Controls.Page page)
{
page.Unloaded += PageUnloaded;
void PageUnloaded(object sender, Microsoft.UI.Xaml.RoutedEventArgs e)
{
page.Unloaded -= PageUnloaded;
if (page.Content is Microsoft.UI.Xaml.Controls.ContentPresenter presenter)
{
presenter.Content = null;
}
};
}
};
}
#endif
}
```
### Issues Fixed
Fixes #22790 #18441 #22131
Description
When there are many page elements, repeatedly navigating the interface can cause a crash
NO exception, Just crash
First report on #18331,Android platform. To prevent misunderstandings, create a new issue for the Windows platform
Steps to Reproduce
下载 https://github.com/BaY1251/MauiDebug.git
打开 /ANR/ANR.sln 编译生成工程,并运行.
点击 Shell, 反复切换Home和Sec界面,约10次后,问题复现
#translate
Download https://github.com/BaY1251/MauiDebug.git
Open /ANR/ANR.sln to compile and generate a project
Running
Click on Shell and repeatedly switch between the Home and Sec interfaces. After about 10 times, the problem reappear
Link to public reproduction project repository
https://github.com/BaY1251/MauiDebug.git
Version with bug
8.0.0-rc.2.9373
Is this a regression from previous behavior?
Not sure, did not test other versions
Last version that worked well
Unknown/Other
Affected platforms
Windows
Affected platform versions
Windows10-22H2 net8.0-windows10.0.19041.0
Did you find any workaround?
No response
Relevant log output
No response
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