App crashing when trying to open scanner in release build

Hello,
in the project of my company the app currently crashes when trying to open it.
This only happens when the app is build in the relase configuration but works like a charm in debug.
Do you have any idea how to implement the scanner in a different way to stop this behavior?
This is how its implemented as a popup:

<?xml version="1.0" encoding="utf-8" ?>
<local:BasePage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
                xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                x:Class="App.Views.Popups.ScannerPopupPage"
                xmlns:zxing="clr-namespace:ZXing.Net.Maui.Controls;assembly=ZXing.Net.MAUI.Controls"
                xmlns:local="clr-namespace:App"
                xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
                xmlns:strings="clr-namespace:App.Resources.Strings"
                Title="{x:Static strings:AppResources.Scanner}">
  <Grid>
    <ContentView x:Name="BarcodeReaderContainer"
                 IsVisible="true">
      <zxing:CameraBarcodeReaderView x:Name="CameraBarcodeReader"
                                     BarcodesDetected="BarcodeDetected"
                                     VerticalOptions="FillAndExpand"
                                     HorizontalOptions="FillAndExpand" />
    </ContentView>


    <BoxView x:Name="UpperGrayedOutSection"
             Style="{StaticResource GrayedOutSection}"
             VerticalOptions="Start" />

    <BoxView x:Name="LowerGrayedOutSection"
             Style="{StaticResource GrayedOutSection}"
             VerticalOptions="End" />

    <BoxView x:Name="redline" IsVisible="true" Style="{StaticResource RedLine}"/>

    <Button x:Name="CloseButton" Style="{StaticResource CloseModalButtonStyle}"
            Clicked="OnCloseButtonClicked" />

    <Button x:Name="FlashlightButton" Style="{StaticResource FlashlightButtonStyle}"
            Clicked="OnFlashlightButtonClicked">

      <Button.ImageSource>
        <FileImageSource File="flashlight.png"></FileImageSource>
      </Button.ImageSource>

    </Button>

    <ImageButton Source="pause_icon"
                 IsVisible="False"
                 x:Name="PlayButton"
                 WidthRequest="100"
                 Clicked="PlayButton_Clicked" />

    <ContentView x:Name="AdditionaleContent"
                 VerticalOptions="End"
                 HorizontalOptions="StartAndExpand"
                 Margin="0,0,0,35" />

    <toolkit:MediaElement x:Name="beepPositive"
                          IsVisible="False"
                          Source="Resources/Sounds/BeepPositive.wav"/>
    <toolkit:MediaElement x:Name="beepNegative" 
                          IsVisible="False"
                          Source="Resources/Sounds/error-sound.wav"/>
  </Grid>

</local:BasePage>

I'll gladly provide additional info if needed.
Best regards,
Hans

I’m facing the same issue. Were you able to resolve it? The app works fine in debugging mode, but when switching to release mode with a distribution certificate and uploading it to TestFlight, it crashes immediately on launch.

Same issue today 2025-September-1 with version
ZXing.Net.Xamarin 3.0.0 and
ZXing.Net.Mobile 3.1.0_beta2
Is there Some known fix or turn around ?

Can you try this: https://blog.verslu.is/maui/exclude-assemblies-from-trimming/ and let me know?

Merci Gerald I’ll try tomorow From: Gerald Versluis ***@***.***> Sent: Monday, 1 September, 2025 05:06 PM To: Redth/ZXing.Net.Maui ***@***.***> Cc: olibara ***@***.***>; Comment ***@***.***> Subject: Re: [Redth/ZXing.Net.Maui] App crashing when trying to open scanner in release build (Issue #207) <https://avatars.githubusercontent.com/u/939291?s=20&v=4> jfversluis left a comment (Redth/ZXing.Net.Maui#207) <#207 (comment)> Can you try this: https://blog.verslu.is/maui/exclude-assemblies-from-trimming/ and let me know? — Reply to this email directly, view it on GitHub <#207 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUNGXZYRSZII6COZHT6SJ33QROD5AVCNFSM6AAAAACFKMYRXOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTENBSGY4DEOBRGQ> . You are receiving this because you commented. <https://github.com/notifications/beacon/ACUNGXZKL26R4PRKR2OBNCD3QROD5A5CNFSM6AAAAACFKMYRXOWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTWBI5U34.gif> Message ID: ***@***.*** ***@***.***> >

Hello Gerald
I've tried to disable trimming as mentionned
<PublishTrimmed>false</PublishTrimmed>
But it gives an error :

C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\35.0.78\tools\Xamarin.Android.Common.targets(523,3): error XA1030:
The 'RunAOTCompilation' MSBuild property is only supported when trimming is enabled.
Edit the project file in a text editor to set 'PublishTrimmed' to 'true' for this build configuration.

I've also tried to remove another property in the csproj

<TrimMode>full</TrimMode>

It also gives an error

Anyway I will try the linker.xml because it is obvious that the issue is coming from the zxing assembly

I will add this

<linker>
  <!-- Preserve Zxing assemblies  -->
  <assembly fullname="ZXing.Net.Xamarin" preserve="all" />
</linker>

And let you know

Hello,
same issue with the Linker explicit directive, in debug it works like a charm but still crash in Release, I will investigate the Logcat details

Hello Gerald The issue was indeed due to the linker 👍 And finaly a friend of mine got the right fix This what need to be added in the csproj <ItemGroup Condition="'$(Configuration)' == 'Release'"> <TrimmerRootAssembly Include="ZXingNetMobile" RootMode="library" /> </ItemGroup> From: Gerald Versluis ***@***.***> Sent: Monday, 1 September, 2025 05:06 PM To: Redth/ZXing.Net.Maui ***@***.***> Cc: olibara ***@***.***>; Comment ***@***.***> Subject: Re: [Redth/ZXing.Net.Maui] App crashing when trying to open scanner in release build (Issue #207) <https://avatars.githubusercontent.com/u/939291?s=20&v=4> jfversluis left a comment (Redth/ZXing.Net.Maui#207) <#207 (comment)> Can you try this: https://blog.verslu.is/maui/exclude-assemblies-from-trimming/ and let me know? — Reply to this email directly, view it on GitHub <#207 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUNGXZYRSZII6COZHT6SJ33QROD5AVCNFSM6AAAAACFKMYRXOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTENBSGY4DEOBRGQ> . You are receiving this because you commented. <https://github.com/notifications/beacon/ACUNGXZKL26R4PRKR2OBNCD3QROD5A5CNFSM6AAAAACFKMYRXOWGG33NNVSW45C7OR4XAZNMJFZXG5LFINXW23LFNZ2KUY3PNVWWK3TUL5UWJTWBI5U34.gif> Message ID: ***@***.*** ***@***.***> >

The issue was indeed due to the linker 👍

Thanks to Gerald and Jo

This what need to be added in the csproj

<ItemGroup Condition="'$(Configuration)' == 'Release'">
   <TrimmerRootAssembly Include="ZXingNetMobile" RootMode="library" />
 </ItemGroup>

We probably should look at how to make the library trimmer safe, but for now this is a good workaround. Thanks for letting us know!

@jfversluis

@jfversluis
Getting this error while adding the workaround
ILLink : error IL1032: Root assembly 'ZXingNetMobile' could not be found. [{Project}.csproj::TargetFramework=net9.0-ios]

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App crashing when trying to open scanner in release build #207

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App crashing when trying to open scanner in release build #207

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deko139931 commented on Jan 21, 2025

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