Remove IMvcCoreBuilder parameter from AddOpenApi()

docs/usage/openapi.md

@@ -16,13 +16,10 @@ The package provides an integration with [Swashbuckle](https://github.com/domain
 2.  Add the integration in your `Program.cs` file.
 
     ```c#
-    IMvcCoreBuilder mvcCoreBuilder = builder.Services.AddMvcCore();
-
-    // Include the mvcBuilder parameter.
-    builder.Services.AddJsonApi<AppDbContext>(mvcBuilder: mvcCoreBuilder);
+    builder.Services.AddJsonApi<AppDbContext>();
 
     // Configure Swashbuckle for JSON:API.
-    builder.Services.AddOpenApi(mvcCoreBuilder);
+    builder.Services.AddOpenApi();
 
     var app = builder.Build();
 

src/Examples/JsonApiDotNetCoreExample/Program.cs

@@ -66,8 +66,6 @@ static void ConfigureServices(WebApplicationBuilder builder)
         SetDbContextDebugOptions(options);
     });
 
-    IMvcCoreBuilder mvcCoreBuilder = builder.Services.AddMvcCore();
-
     using (CodeTimingSessionManager.Current.Measure("AddJsonApi()"))
     {
         builder.Services.AddJsonApi<AppDbContext>(options =>
@@ -82,12 +80,12 @@ static void ConfigureServices(WebApplicationBuilder builder)
             options.IncludeRequestBodyInErrors = true;
             options.SerializerOptions.WriteIndented = true;
 #endif
-        }, discovery => discovery.AddCurrentAssembly(), mvcBuilder: mvcCoreBuilder);
+        }, discovery => discovery.AddCurrentAssembly());
     }
 
     using (CodeTimingSessionManager.Current.Measure("AddOpenApi()"))
     {
-        builder.Services.AddOpenApi(mvcCoreBuilder, options => options.DocumentFilter<SetOpenApiServerAtBuildTimeFilter>());
+        builder.Services.AddOpenApi(options => options.DocumentFilter<SetOpenApiServerAtBuildTimeFilter>());
     }
 }
 

src/JsonApiDotNetCore.OpenApi/ServiceCollectionExtensions.cs

@@ -15,12 +15,11 @@ public static class ServiceCollectionExtensions
     /// <summary>
     /// Adds the OpenAPI integration to JsonApiDotNetCore by configuring Swashbuckle.
     /// </summary>
-    public static void AddOpenApi(this IServiceCollection services, IMvcCoreBuilder mvcBuilder, Action<SwaggerGenOptions>? setupSwaggerGenAction = null)
+    public static void AddOpenApi(this IServiceCollection services, Action<SwaggerGenOptions>? setupSwaggerGenAction = null)
     {
         ArgumentGuard.NotNull(services);
-        ArgumentGuard.NotNull(mvcBuilder);
 
-        AddCustomApiExplorer(services, mvcBuilder);
+        AddCustomApiExplorer(services);
         AddCustomSwaggerComponents(services);
         AddSwaggerGenerator(services);
 
@@ -30,7 +29,7 @@ public static void AddOpenApi(this IServiceCollection services, IMvcCoreBuilder
         }
     }
 
-    private static void AddCustomApiExplorer(IServiceCollection services, IMvcCoreBuilder mvcBuilder)
+    private static void AddCustomApiExplorer(IServiceCollection services)
     {
         services.TryAddSingleton<OpenApiEndpointConvention>();
         services.TryAddSingleton<JsonApiRequestFormatMetadataProvider>();
@@ -49,11 +48,19 @@ private static void AddCustomApiExplorer(IServiceCollection services, IMvcCoreBu
             return new ApiDescriptionGroupCollectionProvider(actionDescriptorCollectionProvider, apiDescriptionProviders);
         }));
 
-        mvcBuilder.AddApiExplorer();
+        AddApiExplorer(services);
 
         services.AddSingleton<IConfigureOptions<MvcOptions>, ConfigureMvcOptions>();
     }
 
+    private static void AddApiExplorer(IServiceCollection services)
+    {
+        // The code below was copied from the implementation of MvcApiExplorerMvcCoreBuilderExtensions.AddApiExplorer(),
+        // so we don't need to take IMvcCoreBuilder as an input parameter.
+
+        services.TryAddEnumerable(ServiceDescriptor.Transient<IApiDescriptionProvider, DefaultApiDescriptionProvider>());
+    }
+
     private static void AddCustomSwaggerComponents(IServiceCollection services)
     {
         services.TryAddSingleton<ISerializerDataContractResolver, JsonApiDataContractResolver>();

test/OpenApiTests/OpenApiStartup.cs

@@ -13,11 +13,9 @@ public class OpenApiStartup<TDbContext> : TestableStartup<TDbContext>
 {
     public override void ConfigureServices(IServiceCollection services)
     {
-        IMvcCoreBuilder mvcBuilder = services.AddMvcCore();
+        base.ConfigureServices(services);
 
-        services.AddJsonApi<TDbContext>(SetJsonApiOptions, mvcBuilder: mvcBuilder);
-
-        services.AddOpenApi(mvcBuilder, SetupSwaggerGenAction);
+        services.AddOpenApi(SetupSwaggerGenAction);
     }
 
     protected override void SetJsonApiOptions(JsonApiOptions options)