Multi-Targeting Startup.cs

Startup.cs

    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)
        {
            services
#if NETCOREAPP2_2
                .AddMvc()
#endif
#if NETCOREAPP3_0 || NETCOREAPP3_1
                .AddControllersWithViews()
                .AddNewtonsoftJson(opts =>
                {
                    opts.SerializerSettings.MaxDepth = 1;
                    opts.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
                    opts.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
                })
#endif
                ;

            services.AddMemoryCache();

            services.AddAuthentication();

            services.AddSwaggerGen(opts =>
            {
                opts.SwaggerDoc("v1", new OpenApiInfo { Title = "Recipes Document", Version = "v1" });
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
#if NETCOREAPP3_0 || NETCOREAPP3_1
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
#endif
#if NETCOREAPP2_2
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
#endif
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseSwagger();

            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "API v1");
            });

#if NETCOREAPP2_2
            app.UseAuthentication();
            app.UseMvc();
#endif

#if NETCOREAPP3_0 || NETCOREAPP3_1

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
            });
#endif
        }
    }
}