eShopOnContainers/src/Services/Catalog/Catalog.API/Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.ApiExplorer;
using Microsoft.AspNetCore.Mvc.Formatters;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.eShopOnContainers.Services.Catalog.API.Infrastructure;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Serialization;
using System.Threading.Tasks;

namespace Microsoft.eShopOnContainers.Services.Catalog.API
{
    public class Startup
    {
        public IConfigurationRoot Configuration { get; }

        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile($"settings.json",optional:false)
                .AddEnvironmentVariables();


            Configuration = builder.Build();
        }

        

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<IConfiguration>(Configuration);

            services.AddDbContext<CatalogContext>(c => 
            {
                c.UseNpgsql(Configuration["ConnectionString"]);
                c.ConfigureWarnings(wb =>
                {
                    wb.Throw(RelationalEventId.QueryClientEvaluationWarning);
                });
            });

            // Add framework services.

            services.AddCors();

            services.AddMvcCore()
                 .AddJsonFormatters(settings=>
                 {
                     settings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                 });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {

            //Configure logs

            if(env.IsDevelopment())
            {   
                app.UseDeveloperExceptionPage();
            }

            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            //Seed Data

            CatalogContextSeed.SeedAsync(app)
                .Wait();

            // Use frameworks
            app.UseCors(policyBuilder=>policyBuilder.AllowAnyOrigin());

            app.UseMvc();
        }
    }
}