Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using GraphQLTest.Services;
using GraphQLTest.GraphQL;
using GraphQL;
using GraphQL.Server;
using GraphQL.Server.Ui.Playground;

namespace GraphQLTest
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Inject các interfaces
            services.AddScoped<ICustomerService, CustomerService>();
            services.AddScoped<IOrderService, OrderService>();

            // Cấu hình GraphQL
            services.AddScoped<IDependencyResolver>(s => new FuncDependencyResolver(s.GetRequiredService));
            services.AddScoped<GraphTestSchema>();
            services.AddGraphQL(o => {
                o.ExposeExceptions = true;
            }).AddGraphTypes(ServiceLifetime.Scoped);

            services.AddMvc().SetCompatibilityVersion(Microsoft.AspNetCore.Mvc.CompatibilityVersion.Version_2_2);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            // Cấu hình GraphQL
            app.UseGraphQL<GraphTestSchema>();
            // Ở đây sử dụng PlayGround UI
            app.UseGraphQLPlayground(new GraphQLPlaygroundOptions());

            app.UseMvc();
        }
    }
}