Startup.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Swashbuckle.AspNetCore.Swagger;

namespace searchpe_exchange_rate
{
    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.AddCors();
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
            // Register the Swagger generator, defining one or more Swagger documents
            services.AddSwaggerGen(swagger =>
            {
                var contact = new Contact() { Name = SwaggerConfiguration.ContactName, Url = SwaggerConfiguration.ContactUrl };
                swagger.SwaggerDoc(SwaggerConfiguration.DocNameV1,
                                   new Info
                                   {
                                       Title = SwaggerConfiguration.DocInfoTitle,
                                       Version = SwaggerConfiguration.DocInfoVersion,
                                       Description = SwaggerConfiguration.DocInfoDescription,
                                       Contact = contact
                                   });
            });
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            // Enable middleware to serve generated Swagger as a JSON endpoint.
            app.UseSwagger();

            // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.), specifying the Swagger JSON endpoint.
            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint(SwaggerConfiguration.EndpointUrl, SwaggerConfiguration.EndpointDescription);
            });

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