Get all routes, including default routes specified at start up

Get_All_Routes_in_ASP.NET_MVC_Core_2.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.Internal;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
using Newtonsoft.Json;
using System;
using System.Linq;
using System.Threading.Tasks;

namespace Extentions
{
    public static class GetAllRoutes
    {
        public static IApplicationBuilder AllRoutes(this IRouteBuilder routeBuilder, PathString pathString)
        {
            var app = routeBuilder.ApplicationBuilder;
            app.Map(pathString, builder => {
                builder.UseMiddleware<GetRoutes>(routeBuilder);
            });
            return app;
        }
    }

    public class GetRoutes
    {
        private IRouteBuilder _routeBuilder;

        public GetRoutes(RequestDelegate next, IRouteBuilder routeBuilder)
        {
            _routeBuilder = routeBuilder;
        }


        public async Task Invoke(HttpContext context)
        {
            try
            {
                var globals = _routeBuilder?.Routes?.Where(r => r.GetType() != typeof(AttributeRoute)).Select(r => {
                    Route _r = ((Route)(r));
                    return new
                    {
                        _r.Name,
                        Template = _r.RouteTemplate,
                        DefaultAction = _r.Defaults["action"],
                        DefaultController = _r.Defaults["controller"],
                    };
                });

                IActionDescriptorCollectionProvider _actionDescriptorCollectionProvider = context.RequestServices.GetRequiredService<IActionDescriptorCollectionProvider>();

                var actions = _actionDescriptorCollectionProvider.ActionDescriptors.Items.Select(a => new RouteDescription
                {
                    Action = a.RouteValues["action"],
                    Controller = a.RouteValues["controller"],
                    Name = a?.AttributeRouteInfo?.Name,
                    Templates = new string[] { a?.AttributeRouteInfo?.Template },
                    HttpMethods = a?.ActionConstraints?.OfType<HttpMethodActionConstraint>().FirstOrDefault()?.HttpMethods
                });

                await context.Response.WriteAsync(JsonConvert.SerializeObject(new { globals, actions }));
                return;
            }
            catch (Exception e)
            {
                await context.Response.WriteAsync($"{e.Message}");
                return;
            }
        }
    }
}

Is there any way to get params?

The gist seems to be missing the RouteDescription. It can be safely removed, however, for the code to work. In that case it just creates an instance of an anonymous type. Thank you for sharing! 😄

Hope there were something like this for .net framework (not core). Pointers anybody? Thanks.