Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CommanderGQL.Data;
using CommanderGQL.GraphQL;
using CommanderGQL.GraphQL.Commands;
using CommanderGQL.GraphQL.Platforms;
using CommanderGQL.Models;
using GraphQL.Server.Ui.Voyager;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace CommanderGQL
{
    public class Startup
    {
        private readonly IConfiguration Configuration;
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddPooledDbContextFactory<AppDbContext>(opt =>
            opt.UseSqlServer(Configuration.GetConnectionString("CommandConStr")));

            services.AddGraphQLServer()
            .AddQueryType<Query>()
            .AddMutationType<Mutation>()
            .AddSubscriptionType<Subscription>()
            .AddType<PlatformType>()
            .AddType<CommandType>()
            .AddFiltering()
            .AddSorting()
            .AddInMemorySubscriptions();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseWebSockets();
            app.UseRouting();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapGraphQL();
            });
            app.UseGraphQLVoyager(new VoyagerOptions()
            {
                GraphQLEndPoint = "/graphql",
            }, "/grapql-voyager");
        }
    }
}