.NET MAUI
A Microsoft open-source framework for building native device applications spanning mobile, tablet, and desktop.
3,231 questions
.NET MAUI - Unhandled Exception located in 'Microsoft.Maui.Platform.MauiWebView'
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(12.8, 56.00000000000001%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EU%3C/text%3E%3C/svg%3E)
UnexpectedGrit
11
Reputation points
XAML WebView element definitions:
<WebView
x:Name="ElectricArcGif"
VerticalOptions="Center"
HeightRequest="40" />
<WebView
x:Name="ClintHatGif"
VerticalOptions="Center"
HeightRequest="200" />
C# code-behind:
public partial class NavOpenTechStartPage : ContentPage
{
public NavOpenTechStartPage()
{
InitializeComponent();
ElectricArcGif.Source = new UrlWebViewSource
{
Url = "file:///android_asset/electricityarc.html"
};
ClintHatGif.Source = new UrlWebViewSource
{
Url = "file:///android_asset/clinthat.html"
};
}
private async void BackButton_Clicked(object sender, EventArgs e)
{
await Shell.Current.GoToAsync("//MainPage");
}
private async void RapidFirePDF_Clicked(object sender, EventArgs e)
{
await Shell.Current.GoToAsync("NavRapidFirePDF");
}
}
HTML files
<html>
<body style="background-color: lightyellow; padding: 0; margin: 0; display: flex; justify-content: center; align-items: center; height: 100vh">
<img src="electricityarc.gif" style="height: 40px; width: 100%; object-fit: cover;">
</body>
</html>
<html>
<body style="background-color: lightyellow; padding: 0; margin: 0; display: flex; justify-content: center; align-items: center; height: 100vh">
<img src="clinteastwood.gif" style="height: 200px; width: 100%; object-fit: contain;">
</body>
</html>
Build Release and Build Debug modes work correctly, but discovered element WebView will throw an exception, but NOT every time. I managed to capture the following error message and call stack...
System.ObjectDisposedException
Message=Cannot access a disposed object.
Object name: 'Microsoft.Maui.Platform.MauiWebView'.
Call stack follows:
<--- SNIP --->
0xFFFFFFFFFFFFFFFF in Android.Runtime.RuntimeNativeMethods.monodroid_debugger_unhandled_exception C#
0x1A in Android.Runtime.JNINativeWrapper._unhandled_exception at /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:12,5 C#
0x23 in Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L at /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:364,26 C#
0x2E in Java.Interop.JniPeerMembers.AssertSelf at /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.cs:153,5 C#
0x1 in Java.Interop.JniPeerMembers.JniInstanceMethods.InvokeVirtualObjectMethod at /Users/runner/work/1/s/xamarin-android/external/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:858,5 C#
0x12 in Android.Webkit.WebView.get_WebViewClient at /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net8.0/android-34/mcw/Android.Webkit.WebView.cs:1388,6 C#
0xD in Microsoft.Maui.Handlers.WebViewHandler.DisconnectHandler at D:\a\_work\1\s\src\Core\src\Handlers\WebView\WebViewHandler.Android.cs:54,5 C#
0x7 in Microsoft.Maui.Handlers.ViewHandler<Microsoft.Maui.IWebView,Android.Webkit.WebView>.OnDisconnectHandler at D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:79,4 C#
0x13 in Microsoft.Maui.Handlers.ViewHandler.OnDisconnectHandler at D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandler.cs:214,4 C#
0x2 in Microsoft.Maui.Handlers.ElementHandler.DisconnectHandler at D:\a\_work\1\s\src\Core\src\Handlers\Element\ElementHandler.cs:112,4 C#
0x20 in Microsoft.Maui.Handlers.ElementHandler.Microsoft.Maui.IElementHandler.DisconnectHandler at D:\a\_work\1\s\src\Core\src\Handlers\Element\ElementHandler.cs:130,5 C#
0x64 in Microsoft.Maui.Controls.Element.SetHandler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:919,6 C#
0x2 in Microsoft.Maui.Controls.Element.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:864,11 C#
0x18 in Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\VisualElement\VisualElement.cs:2061,5 C#
0xB0 in Microsoft.Maui.Platform.ElementExtensions.ToHandler at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:96,4 C#
0x2 in Microsoft.Maui.Platform.ElementExtensions.ToPlatform at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:127,4 C#
0x36 in Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer.UpdateContent at D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Android\FrameRenderer.cs:354,4 C#
0x1 in Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer.<>c.<.cctor>b__73_6 at D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Android\FrameRenderer.cs:28,54 C#
0x21 in Microsoft.Maui.PropertyMapper<Microsoft.Maui.Controls.Frame,Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer>. at D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:172,6 C#
0x17 in Microsoft.Maui.PropertyMapper.UpdatePropertyCore at D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:47,4 C#
0x1D in Microsoft.Maui.PropertyMapper.UpdateProperties at D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:82,5 C#
0xE3 in Microsoft.Maui.Controls.Handlers.Compatibility.VisualElementRenderer<Microsoft.Maui.Controls.Frame>.SetVirtualView at D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\VisualElementRenderer.cs:290,4 C#
0x1B in Microsoft.Maui.Controls.Handlers.Compatibility.ViewHandlerDelegator<Microsoft.Maui.Controls.Frame>.SetVirtualView at D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\ViewHandlerDelegator.cs:84,4 C#
0x15 in Microsoft.Maui.Controls.Handlers.Compatibility.FrameRenderer.Microsoft.Maui.IElementHandler.SetVirtualView at D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Android\FrameRenderer.cs:405,4 C#
0x8B in Microsoft.Maui.Controls.Element.SetHandler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:922,6 C#
0x2 in Microsoft.Maui.Controls.Element.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:864,11 C#
0x18 in Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\VisualElement\VisualElement.cs:2061,5 C#
0xB0 in Microsoft.Maui.Platform.ElementExtensions.ToHandler at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:96,4 C#
0x2 in Microsoft.Maui.Platform.ElementExtensions.ToPlatform at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:127,4 C#
0x83 in Microsoft.Maui.Handlers.LayoutHandler.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\Layout\LayoutHandler.Android.cs:41,5 C#
0x7 in Microsoft.Maui.Handlers.ViewHandler<Microsoft.Maui.ILayout,Microsoft.Maui.Platform.LayoutViewGroup>.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:56,4 C#
0x8B in Microsoft.Maui.Controls.Element.SetHandler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:922,6 C#
0x2 in Microsoft.Maui.Controls.Element.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:864,11 C#
0x18 in Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\VisualElement\VisualElement.cs:2061,5 C#
0xB0 in Microsoft.Maui.Platform.ElementExtensions.ToHandler at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:96,4 C#
0x2 in Microsoft.Maui.Platform.ElementExtensions.ToPlatform at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:127,4 C#
0x83 in Microsoft.Maui.Handlers.LayoutHandler.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\Layout\LayoutHandler.Android.cs:41,5 C#
0x7 in Microsoft.Maui.Handlers.ViewHandler<Microsoft.Maui.ILayout,Microsoft.Maui.Platform.LayoutViewGroup>.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:56,4 C#
0x8B in Microsoft.Maui.Controls.Element.SetHandler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:922,6 C#
0x2 in Microsoft.Maui.Controls.Element.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:864,11 C#
0x18 in Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\VisualElement\VisualElement.cs:2061,5 C#
0xB0 in Microsoft.Maui.Platform.ElementExtensions.ToHandler at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:96,4 C#
0x2 in Microsoft.Maui.Platform.ElementExtensions.ToPlatform at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:127,4 C#
0x60 in Microsoft.Maui.Handlers.ContentViewHandler.UpdateContent at D:\a\_work\1\s\src\Core\src\Handlers\ContentView\ContentViewHandler.Android.cs:42,5 C#
0x1 in Microsoft.Maui.Handlers.ContentViewHandler.MapContent at D:\a\_work\1\s\src\Core\src\Handlers\ContentView\ContentViewHandler.Android.cs:47,4 C#
0x21 in Microsoft.Maui.PropertyMapper<Microsoft.Maui.IContentView,Microsoft.Maui.Handlers.IContentViewHandler>. at D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:172,6 C#
0x17 in Microsoft.Maui.PropertyMapper.UpdatePropertyCore at D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:47,4 C#
0x1D in Microsoft.Maui.PropertyMapper.UpdateProperties at D:\a\_work\1\s\src\Core\src\PropertyMapper.cs:82,5 C#
0xD1 in Microsoft.Maui.Handlers.ElementHandler.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\Element\ElementHandler.cs:79,4 C#
0x2 in Microsoft.Maui.Handlers.ViewHandler<Microsoft.Maui.IContentView,Microsoft.Maui.Platform.ContentViewGroup>.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:53,4 C#
0x2 in Microsoft.Maui.Handlers.ContentViewHandler.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\ContentView\ContentViewHandler.Android.cs:26,4 C#
0x7 in Microsoft.Maui.Handlers.ViewHandler<Microsoft.Maui.IContentView,Microsoft.Maui.Platform.ContentViewGroup>.SetVirtualView at D:\a\_work\1\s\src\Core\src\Handlers\View\ViewHandlerOfT.cs:56,4 C#
0x8B in Microsoft.Maui.Controls.Element.SetHandler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:922,6 C#
0x2 in Microsoft.Maui.Controls.Element.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\Element\Element.cs:864,11 C#
0x18 in Microsoft.Maui.Controls.VisualElement.Microsoft.Maui.IElement.set_Handler at D:\a\_work\1\s\src\Controls\src\Core\VisualElement\VisualElement.cs:2061,5 C#
0xB0 in Microsoft.Maui.Platform.ElementExtensions.ToHandler at D:\a\_work\1\s\src\Core\src\Platform\ElementExtensions.cs:96,4 C#
0x2 in Microsoft.Maui.Platform.ViewExtensions.ToHandler at D:\a\_work\1\s\src\Core\src\Platform\ViewExtensions.cs:44,4 C#
0xBD in Microsoft.Maui.Controls.Platform.Compatibility.ShellContentFragment.OnCreateView at D:\a\_work\1\s\src\Controls\src\Core\Compatibility\Handlers\Shell\Android\ShellContentFragment.cs:145,4 C#
0x24 in AndroidX.Fragment.App.Fragment.n_OnCreateView_Landroid_view_LayoutInflater_Landroid_view_ViewGroup_Landroid_os_Bundle_ at C:\a\_work\1\s\generated\androidx.fragment.fragment\obj\Release\net6.0-android\generated\src\AndroidX.Fragment.App.Fragment.cs:2031,4 C#
0xD in Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLLL_L at /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:363,5 C#
<--- END --->
Microsoft Visual Studio Professional 2022
Version 17.10.1
VisualStudio.17.Release/17.10.1+34928.147
Microsoft .NET Framework
Version 4.8.09037
Installed Version: Professional
ADL Tools Service Provider 1.0
This package contains services used by Data Lake tools
ASA Service Provider 1.0
ASP.NET and Web Tools 17.10.338.1105
ASP.NET and Web Tools
Azure App Service Tools v3.0.0 17.10.338.1105
Azure App Service Tools v3.0.0
Azure Data Lake Tools for Visual Studio 2.6.5000.0
Microsoft Azure Data Lake Tools for Visual Studio
Azure Functions and Web Jobs Tools 17.10.338.1105
Azure Functions and Web Jobs Tools
Azure Stream Analytics Tools for Visual Studio 2.6.5000.0
Microsoft Azure Stream Analytics Tools for Visual Studio
C# Tools 4.10.0-3.24270.2+e8f775c1d8a73dee7ad02408712d714251e708ea
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.
Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
Cookiecutter 17.0.24064.1
Provides tools for finding, instantiating and customizing templates in cookiecutter format.
Extensibility Message Bus 1.4.39 (main@e8108eb)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.
GitHub Copilot 0.2.889.30432
GitHub Copilot is an AI pair programmer that helps you write code faster and with less work.
Microsoft Azure Hive Query Language Service 2.6.5000.0
Language service for Hive query
Microsoft Azure Stream Analytics Language Service 2.6.5000.0
Language service for Azure Stream Analytics
Microsoft Azure Tools for Visual Studio 2.9
Support for Azure Cloud Services projects
Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines
Mono Debugging for Visual Studio 17.10.8 (a565b86)
Support for debugging Mono processes with Visual Studio.
NuGet Package Manager 6.10.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/
Python - Profiling support 17.0.24064.1
Profiling support for Python projects.
Python with Pylance 17.0.24064.1
Provides IntelliSense, projects, templates, debugging, interactive windows, and other support for Python developers.
Razor (ASP.NET Core) 17.10.3.2427201+4f57d1de251e654812adde201c0265a8ca7ca31d
Provides languages services for ASP.NET Core Razor.
SQL Server Data Tools 17.10.171.4
Microsoft SQL Server Data Tools
ToolWindowHostedEditor 1.0
Hosting json editor into a tool window
TypeScript Tools 17.0.30327.2001
TypeScript Tools for Microsoft Visual Studio
Visual Basic Tools 4.10.0-3.24270.2+e8f775c1d8a73dee7ad02408712d714251e708ea
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.
Visual F# Tools 17.10.0-beta.24228.1+dd749058c91585e9b5dae62b0f8df892429ee28f
Microsoft Visual F# Tools
Visual Studio IntelliCode 2.2
AI-assisted development for Visual Studio.
VisualStudio.DeviceLog 1.0
Information about my package
VisualStudio.Mac 1.0
Mac Extension for Visual Studio
VSPackage Extension 1.0
VSPackage Visual Studio Extension Detailed Info
Xamarin 17.10.0.110 (main@cf2e960)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin Designer 17.10.3.10 (remotes/origin/d17-10@3beef58f89)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.
Xamarin.Android SDK 13.2.2.0 (d17-5/45b0e14)
Xamarin.Android Reference Assemblies and MSBuild support.
Mono: d9a6e87
Java.Interop: xamarin/java.interop/d17-5@149d70fe
SQLite: xamarin/sqlite/3.40.1@68c69d8
Xamarin.Android Tools: xamarin/xamarin-android-tools/d17-5@ca1552d
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 40%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYL%3C/text%3E%3C/svg%3E)
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 39,391 Reputation points Microsoft Vendor2024-06-04T09:40:20.85+00:00 For further investigation, could you please provide the following information?
- I have used the same code to test it multiple times on Android 33 and 34 emulators, and the program did not have this error message. Does this problem occur on the Android emulator? What is the API level?
- Could you please post the text on the image as text for better readability?
Message=Cannot access a disposed object.
This error means that when calling WebView somewhere, the object has already been disposed.
Usually, WebView will execute the Dispose method after leaving the page containing WebView. I noticed that your code contains navigation methods. Did you call these two WebViews in an external page? When this error is triggered, is the program in the page switching state?
Your prompt reply will be highly appreciated.
-
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 39,391 Reputation points Microsoft Vendor
2024-06-10T09:14:53.2566667+00:00 May I know whether your issue has been solved or not? If you're still having problems, please explain in detail what is still going wrong and what you need help with.
-
UnexpectedGrit 11 Reputation points
2024-06-17T14:25:40.7+00:00 Does this problem occur on the Android emulator?
Good question to ask. After posting my experience, I began to notice Android Device Manager in Visual Studio 2022 was struggling to bring up my Pixel Tablet M-DPI 10.1in emulated device. After some research, I decided to try and upgrade my Android emulator "system-images" using "Android Studio Jellyfish | 2023.3.1 Patch 1". My Android Emulator's target device was: Android 14 - API 34, processor x86_64. I successfully upgraded the "system-images", exited "Android Studio", restarted "Visual Studio 2022" and was able to launch Android Device Manager and successfully bring up my Pixel Tablet M-DPI 10.1in emulated device. Next, I launched my Android application. The error seemed to no longer appear. So in my case, I guess my "system-images" were old and needed to be upgraded. Thank you for asking the right questions!
-
UnexpectedGrit 11 Reputation points
2024-06-17T14:30:16.39+00:00 The issue no longer appeared after updating the Android Emulator "system-images" for Android 14 API-34 using "Android Studio" on my Windows 10 platform.
-
Yonglun Liu (Shanghai Wicresoft Co,.Ltd.) 39,391 Reputation points Microsoft Vendor
2024-06-18T05:25:33.5666667+00:00 Thanks for your feedback.
Could you please collate the solution and post it as an Answer?
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