'GetAuthenticationStateAsync was called before SetAuthenticationState.'

[Grauenwolf]

Describe the bug

GetAuthenticationStateAsync throws an InvalidOperationException with the message:

'GetAuthenticationStateAsync was called before SetAuthenticationState.'

I do not know if this is an actual bug or just a lack of documentation on its correct use.

ref: https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.components.server.serverauthenticationstateprovider?view=aspnetcore-3.0

To Reproduce

Inject a ServerAuthenticationStateProvider into a page. Then call 'GetAuthenticationStateAsync in any of its async-events.

Further technical details

<PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="3.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="3.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="3.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="3.0.0" />
<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="3.0.0" />

[mkArtakMSFT]

Thanks for contacting us.
@SteveSandersonMS can you please look into this, thanks!

[Grauenwolf]

I switched to using [CascadingParameter] Task<AuthenticationState> AuthenticationState { get; set; } instead. If that's actually the right way to do it then a simple note in the GetAuthenticationStateAsync docs would be sufficient.

[sven5]

You'll have to manually register the AuthenticationStateProvider in ConfigureServices:
services.AddScoped<AuthenticationStateProvider, ServerAuthenticationStateProvider>();

This is a little weird as I expected that this service is already registered behind the scenes. 😏
I assume someone forgot to register this.

Update: Be aware not to use AddSingleton but use instead AddScoped. This is really important.

[rysep2]

I get the same error when I try to access the AuthenticationStateProvider from any service class.