TypedResults metadata are not inferred for API Controllers

[brunolins16]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

As described in HttpResults type, IResult types are supported in API Controller, however, after #43543 the metadata from IEndpointMetadataProvider are not populated to API Controller Actions anymore.

It is caused because the ActionDescriptor is already created when the EndpointMetadataPopulator is called and not getting updated.

aspnetcore/src/Mvc/Mvc.Core/src/Routing/ActionEndpointFactory.cs

Line 372 in bb6a05b

EndpointMetadataPopulator.PopulateMetadata(controllerActionDescriptor.MethodInfo, builder);

swagger.json

{
  "openapi": "3.0.1",
  "info": {
    "title": "WebApplication22",
    "version": "1.0"
  },
  "paths": {
    "/api/Test": {
      "get": {
        "tags": [
          "Test"
        ],
        "responses": {
          "200": {
            "description": "Success"
          }
        }
      }
    }
  },
  "components": { }
}

Expected Behavior

swagger.json

{
  "openapi": "3.0.1",
  "info": {
    "title": "WebApplication22",
    "version": "1.0"
  },
  "paths": {
    "/api/Test": {
      "get": {
        "tags": [
          "Test"
        ],
        "responses": {
          "200": {
            "description": "Success",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/FooBar"
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "schemas": {
      "FooBar": {
        "type": "object",
        "properties": {
          "requiredParam": {
            "type": "string",
            "nullable": true
          }
        },
        "additionalProperties": false
      }
    }
  }
}

Steps To Reproduce

using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.AspNetCore.Mvc;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}


app.MapControllers();


app.Run();


[ApiController]
[Route("api/[controller]")]
public class TestController : ControllerBase
{
    [HttpGet]
    public Ok<FooBar> GEt()
     => TypedResults.Ok(new FooBar() { RequiredParam = ""});
}

public class FooBar
{
    public required string RequiredParam { get; set; }
}

Exceptions (if any)

No response

.NET Version

8.0.100-alpha.1.22472.9

Anything else?

No response

[andresmoschini]

+1

[honzapatCZ]

bump