SelectedItems don't work

[thunderhead021]

Describe the bug
I have a Datagrid with an ObservableCollection as the binding for SelectedItems. I didn't given SelectionMode, but even when I give it as Multiple, it also not work. The app freeze and close.

To Reproduce
Steps to reproduce the behavior:

1. create DataGrid
2. add ObservableCollection A as ItemsSource
3. add ObservableCollection B as SelectedItems

Expected behavior
The app and DataGrid should be working like normal. And rows show selected effect when ObservableCollection B is update.

Desktop (please complete the following information):

• OS: Win11
• DataGrid v 4.0.4
• Maui 9.0.1

[thunderhead021]

Update: I also tested with IList<object> and that also not working
Update2: Tested with List<object> a = new(){}; and this error show up in the call stack
[]' cannot be converted to type 'System.Collections.Generic.List1[System.Object]'`

[VegasJohnson]

It does call from your
var list = new ObservableCollection<Dataview>();

as my issue was the same. cant call from the grid have to call from the list.

`var sel = dataview.SelectedItem as Dataview;

var id = sel.Id.ToString();`

[thunderhead021]

It does call from your
var list = new ObservableCollection();

as my issue was the same. cant call from the grid have to call from the list.

var sel = dataview.SelectedItem as Dataview;

var id = sel.Id.ToString();`

I was doing that. Then I also try IList<object> a {get; set;} which also not working. Tried it in the example also not work as well. My work around right now is to create a helper ViewModel contain the display object, the ID of the row, bool flag to show the selected row in the View and all the operation from the IComparable similar to the streak class from the example and add it to the ViewModel display in the DataGrid. This and also have the RowTapCommand to add/remove it to a private HashSet and check it manually. The only problem I have now is when I change the infomation in that ViewModel, the data of that cell is not update at all in the View even when it's update in the ViewModel

[symbiogenesis]

If you fork this repo, and reproduce the issue with the contained Sample project, that would help me fix it.

[thunderhead021]

@symbiogenesis I have push the example of what my problem is here is also a the output log if you want to compare it:

'Maui.DataGrid.Sample.exe' (CoreCLR: DefaultDomain): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Users\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Maui.DataGrid.Sample.dll'. 
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Users\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Windows.ApplicationModel.WindowsAppRuntime.Projection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Runtime.InteropServices.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Users\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\WinRT.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Collections.Concurrent.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Collections.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Threading.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Runtime.CompilerServices.Unsafe.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Private.Uri.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.ObjectModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.ComponentModel.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Numerics.Vectors.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Users\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.WinUI.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Users\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Windows.SDK.NET.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Security.Cryptography.Algorithms.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Security.Cryptography.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Linq.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Memory.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.InteractiveExperiences.Projection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Linq.Expressions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Reflection.Emit.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'Snippets'. 
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.Essentials.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.Controls.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Extensions.DependencyInjection.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.Controls.Xaml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\CommunityToolkit.Maui.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Extensions.Configuration.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Extensions.Configuration.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Extensions.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Xml.ReaderWriter.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Private.Xml.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.Graphics.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Net.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.Graphics.Win2D.WinUI.Desktop.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\CommunityToolkit.Maui.Core.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Extensions.DependencyInjection.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Extensions.Logging.Abstractions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Diagnostics.Tracing.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Threading.ThreadPool.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Microsoft.Maui.Controls.Compatibility.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.Runtime.Loader.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.6\System.ComponentModel.TypeConverter.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
'Maui.DataGrid.Sample.exe' (CoreCLR: clrhost): Loaded 'C:\Desktop\Maui.DataGrid\Maui.DataGrid.Sample\bin\Debug\net8.0-windows10.0.22621.0\win10-x64\AppX\Maui.DataGrid.dll'. 

[symbiogenesis]

Could it be related to this:

dotnet/maui#8435

[symbiogenesis]

Try using ObservableCollection<object> and then cast afterwards as needed.

Very stupid, I know. I complained about it already, in that thread.

[thunderhead021]

@symbiogenesis I tried the same setup using ObservableCollection<object> which also not working for me. The same output log will always show when I put any type of list in the SelectedItems

[symbiogenesis]

Ok, it looks like the new SR8 that came out today has this fix included:

dotnet/maui#23726

[thunderhead021]

@symbiogenesis sorry for the late reply. I have now tested this with the new update . Unfortunately the app still freeze up like before. At the moment I will stick with my work around even though it's a bit annoying to update the row view separately for each column like that.