Having more than one [FromForm] IFormFile in a request throws an exception

[andersemil]

System.ArgumentException: Can not add property ContentType to Newtonsoft.Json.Linq.JObject. Property with the same name already exists on object.
   at Newtonsoft.Json.Linq.JObject.ValidateToken(JToken o, JToken existing) in /_/Src/Newtonsoft.Json/Linq/JObject.cs:line 144
   at Newtonsoft.Json.Linq.JContainer.InsertItem(Int32 index, JToken item, Boolean skipParentCheck) in /_/Src/Newtonsoft.Json/Linq/JContainer.cs:line 367
   at Microsoft.AspNetCore.ApiHelp.Core.HelpController.HandleRequest(ApiDescription item)
   at Microsoft.AspNetCore.ApiHelp.Core.HelpController.Handle(ApiDescription item, Boolean checkPolicy)
   at Microsoft.AspNetCore.ApiHelp.Core.HelpController.Handle(ApiDescriptionGroup group)
   at Microsoft.AspNetCore.ApiHelp.Core.HelpController.Get()
   at lambda_method(Closure , Object , Object[] )
   at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.ApiHelp.ApiHelpMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.ApiHelp.RedirectMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

[rigofunc]

@andersemil This repo developed in .net core early day, that time NSwagger not support .net core, but now NSwagger maybe better choose.