Invalid Sample for Custom AuthenticationStateProvider

When implemented as described here, the following exception is thrown:

Exceptions

crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Specified cast is not valid.
System.InvalidCastException: Specified cast is not valid.
   at Microsoft.Extensions.DependencyInjection.WebAssemblyAuthenticationServiceCollectionExtensions.<>c__0`3[[Microsoft.AspNetCore.Components.WebAssembly.Authentication.RemoteAuthenticationState, Microsoft.AspNetCore.Components.WebAssembly.Authentication, Version=5.0.4.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[Microsoft.AspNetCore.Components.WebAssembly.Authentication.RemoteUserAccount, Microsoft.AspNetCore.Components.WebAssembly.Authentication, Version=5.0.4.0, Culture=neutral, PublicKeyToken=adb9793829ddae60],[Microsoft.Authentication.WebAssembly.Msal.Models.MsalProviderOptions, Microsoft.Authentication.WebAssembly.Msal, Version=5.0.4.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]].<AddRemoteAuthentication>b__0_1(IServiceProvider sp)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitFactory(FactoryCallSite factoryCallSite, RuntimeResolverContext context)
   at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteVisitor`2[[Microsoft.Extensions.DependencyInjection.ServiceLookup.RuntimeResolverContext, Microsoft.Extensions.DependencyInjection, Version=5.0.0.1, Culture=neutral, PublicKeyToken=adb9793829ddae60],[System.Object, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].VisitCallSiteMain(ServiceCallSite callSite, RuntimeResolverContext argument)

Further technical details

Used Visual Studio 2019.

<ItemGroup Condition="'$(TargetFramework)' == 'net5.0' ">
   <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="5.0.4" />
   <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="5.0.4" PrivateAssets="all" />
   <PackageReference Include="Microsoft.AspNetCore.Localization" Version="2.2.0" />
   <PackageReference Include="Microsoft.Extensions.Localization" Version="5.0.4" />
   <PackageReference Include="Microsoft.Authentication.WebAssembly.Msal" Version="5.0.4" />
   <PackageReference Include="Microsoft.Extensions.Http" Version="5.0.0" />
 </ItemGroup>

Cross-reference: https://github.com/dotnet/AspNetCore.Docs/issues/21802 cc: @guardrex

[marcoCasamento]

I have that exact problem, and I’ve tried to implement both IRemoteAuthenticationService and IAccessTokenProvider, ending up with a so messy copy and paste of code that I eventually give up. I put a switch on configuration that allows the application to be authenticated EITHER through custom auth OR MSAL. I do agree that this is a pretty basic requirement, even more urgent giving the lack of an identity server to be provided that could work-around the problem.

What would be the recommended way of solving the problem?

[msftbot[bot]]

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