MAUI EF Core 6 crash on IOS

Question

Getting immediate crash during saving data into sqlite. using following release parameters

<PropertyGroup Condition="'$(Configuration)|$(TargetFramework)|$(Platform)'=='Release|net6.0-ios|AnyCPU'">
    <MtouchProfiling>True</MtouchProfiling>
    <MtouchExtraArgs>--interpreter</MtouchExtraArgs>
    <UseInterpreter>True</UseInterpreter>
  </PropertyGroup>

used packages

<PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.16" />    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="6.0.16" />    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.16">      <PrivateAssets>all</PrivateAssets>      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>    </PackageReference>

at this stage using prepopulated database which copied following way

var assembly = IntrospectionExtensions.GetTypeInfo(typeof(App)).Assembly;
var names = assembly.GetManifestResourceNames();
using (Stream stream = assembly.GetManifestResourceStream("TestProject.Test.db")) {
    using (MemoryStream memoryStream = new MemoryStream()) {
        stream.CopyTo(memoryStream);

        var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Test.db");

        File.WriteAllBytes(path, memoryStream.ToArray());
    }
}

Data from db retrieved successfully. Save works on Windows and Android.

Answer 1

Hello,

As you said, it's related to the folder path.

var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Test.db");

Please try App data directory (string mainDir = FileSystem.Current.AppDataDirectory;) and refer to
File system helpers - .NET MAUI | Microsoft Learn.

Best Regards,

Wenyan Zhang

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