Swashbuckle.AspNetCore: CLI is not working with project referencing Autofac

Repro steps:

Add swashbuckle nuget packages to the project:
- SwashBuckle.AspNetCore 4.0.1
- SwashBuckle.AspNetCore.Annotations 4.0.1
Configure swashbuckle:

In ConfigureServices:

services.AddSwaggerGen(options =>
{
    var projectName = GetType().Assembly.GetName().Name;
    var path = Path.Combine(AppContext.BaseDirectory, $"{projectName}.xml");

    options.SwaggerDoc("v1", new Info
    {
        Title = $"{projectName} API Reference",
        Version = "v1"
    });

    options.IncludeXmlComments(path, true);
    options.EnableAnnotations();
});

In Configure:

app.UseSwagger();
app.UseSwaggerUI(options => options.SwaggerEndpoint("/swagger/v1/swagger.json", "v1"));

Swashbuckle & Swagger UI now works fine

Add DotNetCliToolReference to .csproj file:

  <ItemGroup>
    <DotNetCliToolReference Include="Swashbuckle.AspNetCore.Cli" Version="4.0.1" />
  </ItemGroup>

dotnet swagger tofile --output swaggerexport.json path\to\project.dll v1

Got an error

Unhandled Exception: System.InvalidOperationException: No service for type 'Microsoft.Extensions.DependencyInjection.IServiceProviderFactory`1[Autofac.ContainerBuilder]' has been registered.
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)
   at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.ConfigureServicesDelegateBuilder`1.<>c__DisplayClass14_0.<ConfigureServices>g__ConfigureServicesWithContainerConfiguration|0(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.Initialize()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at Swashbuckle.AspNetCore.Cli.Program.<>c.<Main>b__0_3(IDictionary`2 namedArgs)
   at Swashbuckle.AspNetCore.Cli.CommandRunner.Run(IEnumerable`1 args)
   at Swashbuckle.AspNetCore.Cli.CommandRunner.Run(IEnumerable`1 args)
   at Swashbuckle.AspNetCore.Cli.Program.Main(String[] args)

About this issue

Original URL
State: closed
Created 5 years ago
Reactions: 6
Comments: 17 (3 by maintainers)

Most upvoted comments

Had the same issue and I got kinda confused by the replies here.

What fixed it for me was adding this:

public class SwaggerHostFactory
{
    public static IHost CreateHost()
    {
        return Program.CreateHostBuilder(new string[0]).Build();
    }
}

This is a separate file from my normal Program.cs, just added it, and seems to work fine.

My use case was that I needed the OpenApi generated at build time so I could generate Typescript services from it (just in case someone is having the same issue).

The above code and this did the trick:

<Target Name="PostBuild" AfterTargets="PostBuildEvent">
   <Exec Command="swagger tofile --output swagger.json $(OutputPath)\$(AssemblyName).dll v1" />
</Target>

GhimpuLucianEduard on Jan 25, 2021

Hi all,

Doesn’t look like i can add Swashbuckle.AspNetCore.Cli to 3.1 projects, therefore i can’t reference ISwaggerWebHostFactory. Do I have another option?

Thanks!

I moved to using NSwag and it works well with Open API/Swagger v3 spec. We also needed to generate the TypeScript interfaces and NSwag does that as well. Was easy to configure as well. Hope that helps!

shivanaru on Apr 23, 2020