Setting IsBusy causes exception/crash

[ryanaw83]

Description

When setting IsBusy in OnAppearing event of a ContentPage it either throws an exception or crashes (on Android). In my main project, it crashes the application. When reproducing in a new MAUI app, it throws an exception having these details...

{System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: MauiContext should have been set on parent. at Microsoft.Maui.Platform.ElementExtensions.ToPlatform(IElement view) in D:\a_work\1\s\src\Core\src\Platform\ElementExtensions.cs:line 110 at Microsoft.Maui.Controls.Platform.AlertManager.AlertRequestHelper.PageIsInThisContext(IView page) in D:\a_work\1\s\src\Controls\src\Core\Platform\AlertManager\AlertManager.Android.cs:line 316 at Microsoft.Maui.Controls.Platform.AlertManager.AlertRequestHelper.OnPageBusy(IView sender, Boolean enabled) in D:\a_work\1\s\src\Controls\src\Core\Platform\AlertManager\AlertManager.Android.cs:line 92 at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) --- End of inner exception stack trace --- at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters) at Microsoft.Maui.Controls.MessagingCenter.Subscription.InvokeCallback(Object sender, Object args) in D:\a_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 96 at Microsoft.Maui.Controls.MessagingCenter.InnerSend(String message, Type senderType, Type argType, Object sender, Object args) in D:\a_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 225 at Microsoft.Maui.Controls.MessagingCenter.Microsoft.Maui.Controls.IMessagingCenter.Send[Page,Boolean](Page sender, String message, Boolean args) in D:\a_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 118 at Microsoft.Maui.Controls.MessagingCenter.Send[Page,Boolean](Page sender, String message, Boolean args) in D:\a_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 111 at Microsoft.Maui.Controls.Page.OnPageBusyChanged() in D:\a_work\1\s\src\Controls\src\Core\Page.cs:line 563 at Microsoft.Maui.Controls.Page.<>c.<.cctor>b__129_0(BindableObject bo, Object o, Object n) in D:\a_work\1\s\src\Controls\src\Core\Page.cs:line 36 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 532 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 466 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 388 at Microsoft.Maui.Controls.BindableObject.SetValue(BindableProperty property, Object value) in D:\a_work\1\s\src\Controls\src\Core\BindableObject.cs:line 362 at Microsoft.Maui.Controls.Page.set_IsBusy(Boolean value) in D:\a_work\1\s\src\Controls\src\Core\Page.cs:line 101 at MauiTestApp.MainPage.OnAppearing() in C:\Users\RyanWillis\source\repos\MauiTestApp\MauiTestApp\MainPage.xaml.cs:line 28 at Microsoft.Maui.Controls.Page.SendAppearing() in D:\a_work\1\s\src\Controls\src\Core\Page.cs:line 487 at Microsoft.Maui.Controls.ShellContent.SendPageAppearing(Page page) in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 150 at Microsoft.Maui.Controls.ShellContent.SendAppearing() in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 131 at Microsoft.Maui.Controls.ShellSection.PresentedPageAppearing() in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellSection.cs:line 958 at Microsoft.Maui.Controls.ShellSection.SendAppearing() in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellSection.cs:line 1060 at Microsoft.Maui.Controls.ShellItem.SendAppearing() in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellItem.cs:line 328 at Microsoft.Maui.Controls.ShellNavigationManager.<>c__DisplayClass16_0.g__WaitForWindowToSet|1(Object sender, EventArgs e) in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellNavigationManager.cs:line 242 at Microsoft.Maui.Controls.Element.OnChildAdded(Element child) in D:\a_work\1\s\src\Controls\src\Core\Element.cs:line 357 at Microsoft.Maui.Controls.ShellContent.OnChildAdded(Element child) in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 156 at Microsoft.Maui.Controls.ShellContent.set_ContentCache(Page value) in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 196 at Microsoft.Maui.Controls.ShellContent.Microsoft.Maui.Controls.IShellContentController.GetOrCreateContent() in D:\a_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 81 at Microsoft.Maui.Controls.Platform.Compatibility.ShellSectionRenderer.OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) in D:\a_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Shell\Android\ShellSectionRenderer.cs:line 123 at AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_inflater, IntPtr native_container, IntPtr native_savedInstanceState) in C:\a_work\1\s\generated\androidx.fragment.fragment\obj\Release\net6.0-android\generated\src\AndroidX.Fragment.App.Fragment.cs:line 1999 at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L(_JniMarshal_PPLLL_L callback, IntPtr jnienv, IntPtr klazz, IntPtr p0, IntPtr p1, IntPtr p2) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 352}

Steps to Reproduce

1. Create new MAUI app
2. Add the code below and run it

protected override void OnAppearing()
	{
		base.OnAppearing();

		IsBusy = true;
	}

Version with bug

6.0.486 (current)

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 10+

Did you find any workaround?

None, it happens every time (on Android), but I was not able to test it on iOS.

Relevant log output

No response

[jsuarezruiz]

Could you attach a small sample where reproduce the issue?. Thanks in advance.

[ghost]

Hi @ryanaw83. We have added the "s/needs-info" label to this issue, which indicates that we have an open question for you before we can take further action. 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.

[ryanaw83]

MauiTestApp.zip

Running this bare-bones MAUI app throws an exception at "IsBusy = true;"

I am using the very latest version of MAUI (pulled directly from Github).

[SunshineSpring666]

For MAUI Android, same Exception encountered here. It happens everytime the app runs.

Simply set IsBusy = true;
then run the app and "System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation." is raised.
Note: The environment is latest VS Preview + latest MAUI.

[jsuarezruiz]

   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at Microsoft.Maui.Controls.MessagingCenter.Subscription.InvokeCallback(Object sender, Object args) in D:\a\_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 96
   at Microsoft.Maui.Controls.MessagingCenter.InnerSend(String message, Type senderType, Type argType, Object sender, Object args) in D:\a\_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 225
   at Microsoft.Maui.Controls.MessagingCenter.Microsoft.Maui.Controls.IMessagingCenter.Send[Page,Boolean](Page sender, String message, Boolean args) in D:\a\_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 118
   at Microsoft.Maui.Controls.MessagingCenter.Send[Page,Boolean](Page sender, String message, Boolean args) in D:\a\_work\1\s\src\Controls\src\Core\MessagingCenter.cs:line 111
   at Microsoft.Maui.Controls.Page.OnPageBusyChanged() in D:\a\_work\1\s\src\Controls\src\Core\Page.cs:line 563
   at Microsoft.Maui.Controls.Page.<>c.<.cctor>b__129_0(BindableObject bo, Object o, Object n) in D:\a\_work\1\s\src\Controls\src\Core\Page.cs:line 36
   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 532
   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 466
   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 388
   at Microsoft.Maui.Controls.BindableObject.SetValue(BindableProperty property, Object value) in D:\a\_work\1\s\src\Controls\src\Core\BindableObject.cs:line 362
   at Microsoft.Maui.Controls.Page.set_IsBusy(Boolean value) in D:\a\_work\1\s\src\Controls\src\Core\Page.cs:line 101
   at MauiTestApp.MainPage.OnAppearing() in C:\Users\jsuarez\Downloads\MauiTestApp\MauiTestApp\MainPage.xaml.cs:line 14
   at Microsoft.Maui.Controls.Page.SendAppearing() in D:\a\_work\1\s\src\Controls\src\Core\Page.cs:line 487
   at Microsoft.Maui.Controls.ShellContent.SendPageAppearing(Page page) in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 150
   at Microsoft.Maui.Controls.ShellContent.SendAppearing() in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 131
   at Microsoft.Maui.Controls.ShellSection.PresentedPageAppearing() in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellSection.cs:line 958
   at Microsoft.Maui.Controls.ShellSection.SendAppearing() in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellSection.cs:line 1060
   at Microsoft.Maui.Controls.ShellItem.SendAppearing() in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellItem.cs:line 328
   at Microsoft.Maui.Controls.ShellNavigationManager.<>c__DisplayClass16_0.<HandleNavigated>g__WaitForWindowToSet|1(Object sender, EventArgs e) in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellNavigationManager.cs:line 242
   at Microsoft.Maui.Controls.Element.OnChildAdded(Element child) in D:\a\_work\1\s\src\Controls\src\Core\Element.cs:line 357
   at Microsoft.Maui.Controls.ShellContent.OnChildAdded(Element child) in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 156
   at Microsoft.Maui.Controls.ShellContent.set_ContentCache(Page value) in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 196
   at Microsoft.Maui.Controls.ShellContent.Microsoft.Maui.Controls.IShellContentController.GetOrCreateContent() in D:\a\_work\1\s\src\Controls\src\Core\Shell\ShellContent.cs:line 81
   at Microsoft.Maui.Controls.Platform.Compatibility.ShellSectionRenderer.OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) in D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Shell\Android\ShellSectionRenderer.cs:line 123
   at AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_inflater, IntPtr native_container, IntPtr native_savedInstanceState) in C:\a\_work\1\s\generated\androidx.fragment.fragment\obj\Release\net6.0-android\generated\src\AndroidX.Fragment.App.Fragment.cs:line 1999
   at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L(_JniMarshal_PPLLL_L callback, IntPtr jnienv, IntPtr klazz, IntPtr p0, IntPtr p1, IntPtr p2) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 352