OpenApi with parameter in route fails when parameter is not on action

[alexdrl]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

I have a problem when there is a controller that has a parameter on the route and a action does not have a parameter

Expected Behavior

OpenApi is generated anyways

Steps To Reproduce

Here is the repro project, just go to /swagger on it https://github.com/[alexdrl/repro-aspnet-openapi](https://github.com/alexdrl/repro-aspnet-openapi)

Exceptions (if any)

System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.AspNetCore.OpenApi.Generated.<OpenApiXmlCommentSupport_generated>F9B1F673FDB092476591348635A5438D773C98AE1AF3391F3C8958C203A73BF70__XmlCommentOperationTransformer.TransformAsync(OpenApiOperation operation, OpenApiOperationTransformerContext context, CancellationToken cancellationToken) in C:\Users\AlejandroDelRincon\code\BBX\Btime2\TestOpenApiRepro\TestOpenApiRepro\obj\Debug\net10.0\Microsoft.AspNetCore.OpenApi.SourceGenerators\Microsoft.AspNetCore.OpenApi.SourceGenerators.XmlCommentGenerator\OpenApiXmlCommentSupport.generated.cs:line 428
at Microsoft.AspNetCore.OpenApi.OpenApiDocumentService.GetOperationsAsync(IGrouping`2 descriptions, OpenApiDocument document, IServiceProvider scopedServiceProvider, IOpenApiOperationTransformer[] operationTransformers, IOpenApiSchemaTransformer[] schemaTransformers, CancellationToken cancellationToken)
at Microsoft.AspNetCore.OpenApi.OpenApiDocumentService.GetOpenApiPathsAsync(OpenApiDocument document, IServiceProvider scopedServiceProvider, IOpenApiOperationTransformer[] operationTransformers, IOpenApiSchemaTransformer[] schemaTransformers, CancellationToken cancellationToken)
at Microsoft.AspNetCore.OpenApi.OpenApiDocumentService.GetOpenApiDocumentAsync(IServiceProvider scopedServiceProvider, HttpRequest httpRequest, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Builder.OpenApiEndpointRouteBuilderExtensions.<>c__DisplayClass0_0.<b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Http.Generated.<GeneratedRouteBuilderExtensions_g>F0399B8B15BE443123F4BECEE84B112C1912EE3F44D9DDD7BFA38E371FB917343__GeneratedRouteBuilderExtensionsCore.<>c__DisplayClass2_0.<g__RequestHandler|5>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

.NET Version

10.0.100

Anything else?

No response

[martincostello]

I think this is a duplicate of #64185.

[alexdrl]

@martincostello yep, it looks like the same, just not an inherited controller.

[dotnet-policy-service]

This issue has been resolved and has not had any activity for 1 day. It will be closed for housekeeping purposes.

See our Issue Management Policies for more information.