App.Current.Resources.MergedDictionaries.Add Unavailable switch the second time

[fanhai]

Description

Steps to Reproduce

1. click switch
2. click switch

Link to public reproduction project repository

null

Version with bug

7.0 (current)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

net7.0-windows10.0.19041.0

Did you find any workaround?

No response

Relevant log output

No response

[fanhai]

at Microsoft.Maui.Controls.VisualElement.OnParentResourcesChanged(IEnumerable1 values) in D:\a\_work\1\s\src\Controls\src\Core\VisualElement.cs:line 1051 at Microsoft.Maui.Controls.Element.OnParentResourcesChanged(Object sender, ResourcesChangedEventArgs e) in D:\a\_work\1\s\src\Controls\src\Core\Element.cs:line 437 at Microsoft.Maui.Controls.Element.OnResourcesChanged(IEnumerable1 values) in D:\a_work\1\s\src\Controls\src\Core\Element.cs:line 500
at Microsoft.Maui.Controls.Element.OnParentResourcesChanged(IEnumerable1 values) in D:\a\_work\1\s\src\Controls\src\Core\Element.cs:line 442 at Microsoft.Maui.Controls.VisualElement.OnParentResourcesChanged(IEnumerable1 values) in D:\a_work\1\s\src\Controls\src\Core\VisualElement.cs:line 1039
at Microsoft.Maui.Controls.Element.OnParentResourcesChanged(Object sender, ResourcesChangedEventArgs e) in D:\a_work\1\s\src\Controls\src\Core\Element.cs:line 437
at Microsoft.Maui.Controls.Element.OnResourcesChanged(IEnumerable1 values) in D:\a\_work\1\s\src\Controls\src\Core\Element.cs:line 500 at Microsoft.Maui.Controls.Element.OnParentResourcesChanged(IEnumerable1 values) in D:\a_work\1\s\src\Controls\src\Core\Element.cs:line 442
at Microsoft.Maui.Controls.Element.OnParentResourcesChanged(Object sender, ResourcesChangedEventArgs e) in D:\a_work\1\s\src\Controls\src\Core\Element.cs:line 437
at Microsoft.Maui.Controls.Element.OnResourcesChanged(IEnumerable1 values) in D:\a\_work\1\s\src\Controls\src\Core\Element.cs:line 500 at Microsoft.Maui.Controls.Element.OnResourcesChanged(Object sender, ResourcesChangedEventArgs e) in D:\a\_work\1\s\src\Controls\src\Core\Element.cs:line 459 at Microsoft.Maui.Controls.ResourceDictionary.OnValuesChanged(KeyValuePair2[] values) in D:\a_work\1\s\src\Controls\src\Core\ResourceDictionary.cs:line 342
at Microsoft.Maui.Controls.ResourceDictionary.MergedDictionaries_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e) in D:\a_work\1\s\src\Controls\src\Core\ResourceDictionary.cs:line 109
at System.Collections.ObjectModel.ObservableCollection1[[Microsoft.Maui.Controls.ResourceDictionary, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].OnCollectionChanged(NotifyCollectionChangedEventArgs e) at System.Collections.ObjectModel.ObservableCollection1[[Microsoft.Maui.Controls.ResourceDictionary, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].OnCollectionChanged(NotifyCollectionChangedAction action, Object item, Int32 index)
at System.Collections.ObjectModel.ObservableCollection1[[Microsoft.Maui.Controls.ResourceDictionary, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].InsertItem(Int32 index, ResourceDictionary item) at System.Collections.ObjectModel.Collection1[[Microsoft.Maui.Controls.ResourceDictionary, Microsoft.Maui.Controls, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].Add(ResourceDictionary item)
at Maons.Languages.SwitchLan(String lang) in C:\Users\fanhai\go\src\github.com\asmbio\Maons\MauiApp3\Languages.cs:line 50
at Maons.my.Mysetup.Picker_SelectedIndexChanged(Object sender, EventArgs e) in C:\Users\fanhai\go\src\github.com\asmbio\Maons\MauiApp3\my\Mysetup.xaml.cs:line 30
at Microsoft.Maui.Controls.Picker.OnSelectedIndexChanged(Object bindable, Object oldValue, Object newValue) in D:\a_work\1\s\src\Controls\src\Core\Picker.cs:line 327
at Microsoft.Maui.Controls.BindableObject.SetValueActual(BindableProperty property, BindablePropertyContext context, Object value, Boolean currentlyApplying, SetValueFlags attributes, Boolean silent) in D:\a_work\1\s\src\Controls\src\Core\BindableObject.cs:line 535
at Microsoft.Maui.Controls.BindableObject.SetValueCore(BindableProperty property, Object value, SetValueFlags attributes, SetValuePrivateFlags privateAttributes) in D:\a_work\1\s\src\Controls\src\Core\BindableObject.cs:line 469
at Microsoft.Maui.Controls.BindableObject.SetValue(BindableProperty property, Object value, Boolean fromStyle, Boolean checkAccess) in D:\a_work\1\s\src\Controls\src\Core\BindableObject.cs:line 391
at Microsoft.Maui.Controls.BindableObject.SetValue(BindableProperty property, Object value) in D:\a_work\1\s\src\Controls\src\Core\BindableObject.cs:line 365
at Microsoft.Maui.Controls.Picker.set_SelectedIndex(Int32 value) in D:\a_work\1\s\src\Controls\src\Core\Picker.cs:line 146
at Microsoft.Maui.Handlers.PickerHandler.b__16_1(Object s, DialogClickEventArgs e) in D:\a_work\1\s\src\Core\src\Handlers\Picker\PickerHandler.Android.cs:line 138
at Android.Content.IDialogInterfaceOnClickListenerImplementor.OnClick(IDialogInterface dialog, Int32 which) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net7.0/android-33/mcw/Android.Content.IDialogInterface.cs:line 251
at Android.Content.IDialogInterfaceOnClickListenerInvoker.n_OnClick_Landroid_content_DialogInterface_I(IntPtr jnienv, IntPtr native__this, IntPtr native_dialog, Int32 which) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net7.0/android-33/mcw/Android.Content.IDialogInterface.cs:line 203
at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLI_V(_JniMarshal_PPLI_V callback, IntPtr jnienv, IntPtr klazz, IntPtr p0, Int32 p1) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 165

[ghost]

Hi @fanhai. We have added the "s/needs-repro" label to this issue, which indicates that we require steps and sample code to reproduce the issue before we can take further action. Please try to create a minimal sample project/solution or code samples which reproduce the issue, ideally as a GitHub repo that we can clone. See more details about creating repros here: https://github.com/dotnet/maui/blob/main/.github/repro.md

This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.

[fanhai]

https://github.com/asmbio/Maons.git

MauiApp1 and MauiApp3 are used for testing. You can uninstall others

MauiApp3: Error will be reported when switching
MauiApp1: No error will be reported when switching, but the switching is invalid
Key code location: Title="{StaticResource switchlan}"

[fanhai]

MauiApp3: Step

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[Zhanglirong-Winnie]

Verified this issue with Visual Studio 17.7.0 Preview 1.0. Can repro on windows platform with sample project.
Maons-main.zip
MauiApp1:

MauiApp3:

[Neo-CP]

I have the same error on Android in .Net 8 and VS 17.8.1