Invoking the PropertyChanged event throws NullReferenceException

[AlphaNERD-]

Description

Hello MAUI devs,

so i've been working on a small app for testing purposes. That app uses a ViewModel which implements the INotifyPropertyChanged interface. When i try to update a ListView by invoking PropertyChanged, all i get is a NullReferenceException.

The kicker is that according to VS, the PropertyChanged event is not null. However i cannot check whether the invocation list is null because of some other exception within the debugger. I did implement a null check within my ViewModel hoping that this exception wouldn't come up again but it does.

Steps to Reproduce

1. Build the project
2. Enter something within the entry. Ideally one of the first or last names listed within the constructor of ViewModelTest

Expected behavior:
A list of names should appear under the text box.

Actual behavior:
The debugger reports an uncaught NullReferenceException in OnPropertyChanged().

Link to public reproduction project repository

https://github.com/AlphaNERD-/NETMAUIBindingDemo

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows, macOS

Affected platform versions

Windows 10, macOS 14.4

Did you find any workaround?

No response

Relevant log output

No response

[Zhanglirong-Winnie]

Verified this issue with Visual Studio 17.10.0 Preview 2. Can repro on windows platform with sample project. Android works fine.
https://github.com/AlphaNERD-/NETMAUIBinding

[AlphaNERD-]

Little update: This issue also occurs on macOS with .NET MAUI 8.0.7.

[Toomas75]

The elements specified in the DataTemplate define the appearance of each item in the list, and the child of the DataTemplate must be a Cell object.

<ListView ItemsSource="{Binding TestUsers, Mode=TwoWay}"> <ListView.ItemTemplate> <DataTemplate> <ViewCell> <Label Text="{Binding UserName}"/> </ViewCell> </DataTemplate> </ListView.ItemTemplate> </ListView>