[Bug MAUI Blazor] "Microsoft.AspNetCore.App" not found for "maccatalyst-x64"

[dicong-Apption]

Description

We are managing to transfer our existing Blazor server application into MAUI Blazor project. So far, we got the WinUI project building and working, which is really excited! But, for the main MAUI project, we had a runtime pack error for both mac and ios.

>C:\Program Files\dotnet\sdk\6.0.100-preview.5.21302.13\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(391,5): error NETSDK1082: There was no runtime pack for Microsoft.AspNetCore.App available for the specified RuntimeIdentifier 'iossimulator-x64'.
6>C:\Program Files\dotnet\sdk\6.0.100-preview.5.21302.13\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.FrameworkReferenceResolution.targets(391,5): error NETSDK1082: There was no runtime pack for Microsoft.AspNetCore.App available for the specified RuntimeIdentifier 'maccatalyst-x64'.

After some diggings, we think that the error appears after we add a nuget package like
Askmethat.Aspnet.JsonLocalizer (3.1.1) or Microsoft.AspNetCore.Mvc.NewtonsoftJson (6.0.0-preview.5.21301.17)
I am wondering what could be the reason here? and what can we do to avoid having this issue?

Steps to Reproduce

1. Start from a clean .Net MAUI Blazor project
2. Add a packageReference to <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="6.0.0-preview.5.21301.17" />
   or <PackageReference Include="Askmethat.Aspnet.JsonLocalizer" Version="3.1.1" />
3. Rebuild the main Maui project

Actual Behavior

Basic Information

Microsoft Visual Studio Professional 2019 Preview
Version 16.11.0 Preview 2.0
dotnet --version
6.0.100-preview.5.21302.13
maui-check is clean

the main csproj file if you are curisou,

<Project Sdk="Microsoft.NET.Sdk.Razor">

	<PropertyGroup>
		<!-- iOS, Android, MacCatalyst -->
		<TargetFrameworks>net6.0-ios;net6.0-android;net6.0-maccatalyst</TargetFrameworks>
		<OutputType>Exe</OutputType>
		<SingleProject>true</SingleProject>
		<RootNamespace>MauiApp2</RootNamespace>

		<!-- Display name -->
		<ApplicationTitle>MauiApp2</ApplicationTitle>

		<!-- App Identifier -->
		<ApplicationId>com.companyname.MauiApp2</ApplicationId>

		<!-- Versions -->
		<ApplicationVersion>1.0</ApplicationVersion>
		<AndroidVersionCode>1</AndroidVersionCode>
	</PropertyGroup>

	<ItemGroup>
		<!-- App Icon -->
		<MauiImage Include="Resources\appicon.svg" ForegroundFile="Resources\appiconfg.svg" IsAppIcon="true" Color="#512BD4" />

		<!-- Splash Screen -->
		<MauiSplashScreen Include="Resources\appiconfg.svg" Color="#512BD4" />

		<!-- Images -->
		<MauiImage Include="Resources\Images\*" />

		<!-- Custom Fonts -->
		<MauiFont Include="Resources\Fonts\*" />
	</ItemGroup>

	<ItemGroup>
		<PackageReference Include="Microsoft.AspNetCore.Components.WebView.Maui" Version="6.0.100-preview.5.794" />
		<PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="6.0.0-preview.5.*" />
		<PackageReference Include="Microsoft.Maui" Version="6.0.100-preview.5.794" />
	
	  <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="6.0.0-preview.5.21301.17" />
	</ItemGroup>

	<PropertyGroup>
		<InvariantGlobalization Condition="$(TargetFramework.Contains('-maccatalyst'))">true</InvariantGlobalization>
		<RuntimeIdentifier Condition="$(TargetFramework.Contains('-ios'))">iossimulator-x64</RuntimeIdentifier>
		<RuntimeIdentifier Condition="$(TargetFramework.Contains('-maccatalyst'))">maccatalyst-x64</RuntimeIdentifier>
		<UseInterpreter Condition="$(TargetFramework.Contains('-android'))">True</UseInterpreter>
	</PropertyGroup>
	<ItemGroup Condition="$(TargetFramework.Contains('-android'))">
		<AndroidEnvironment Include="Android\AndroidEnvironment.txt" />
	</ItemGroup>
	<ItemGroup>
	</ItemGroup>

</Project>

[Eilon]

Hi @dicong-Apption , it looks like the Askmethat.Aspnet.JsonLocalizer package requires Blazor WebAssembly, which I don't think is supported on these platforms. I looked at the code for that project and I'm not sure it really needs Blazor WebAssembly to begin with, because at least in the default case it doesn't seem to use anything from Blazor WebAssembly. There are a few #if BLAZORASM cases in the code but I don't see that ever used. So I think that the project could reference Microsoft.AspNetCore.Components instead of Microsoft.AspNetCore.Components.WebAssembly and it would be fine.

Given that this seems to be an external issue, I am closing this issue.

[dicong-Apption]

does this package Microsoft.AspNetCore.Mvc.NewtonsoftJson mean the same as well? I mean, is it supported in .NET MAUI?
For future debug, is there a way to check whether or not a package is supported in .NET MAUI?

[dicong-Apption]

Just tested it with preview 6,
looks like Microsoft.AspNetCore.Mvc.NewtonsoftJson can be compiled now in a clean MAUI project

[Eilon]

The package Microsoft.AspNetCore.Mvc.NewtonsoftJson I think should run everywhere.

I don't know of a good way to just look at a package and know where it will run. BTW it's not so much about .NET MAUI or not. It's more about the OS/architecture. So in your case the package should work fine if you use .NET MAUI but only on Windows.

[dicong-Apption]

ahh, makes sense
really appreciate your time here! Thanks a lot!
I didn't notice that the JsonLocalizer used #if BLAZORASM, thanks for digging it for me!

[Eilon]

@dicong-Apption no problem, this was an interesting issue to investigate. I recommend contacting the author of that package to see if they can change the reference to remove WebAssembly (and move the namespace using statements into #if BLAZORASM) so that it will compile without the dependency.

[Ghevi]

Don't know if this can be helpfull to someone because it's probably a dumb mistake from my part, but the NuGet package Microsoft.AspNetCore.Authentication.OpenIdConnect will also cause these errors.