Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using ErrorMessagesAPI.Config;
using ErrorMessagesAPI.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.Swagger;

namespace ErrorMessagesAPI
{
    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.AddControllers();
        //}
        public void ConfigureServices(IServiceCollection services)
        {
            var config = new ServerConfig();
            Configuration.Bind(config);
            var todoContext = new MessageContext(config.MongoDB);
            var repo = new MessageRepository(todoContext);
            services.AddSingleton<IMessageRepository>(repo);
            services.AddMvc();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo
                {
                    Title = "Error Messages API",
                    Version = "v1",
                    Description = "This is an Error message api descrption",
                    Contact = new OpenApiContact
                    {
                        Name = "Alaa' Omar",
                        Email ="alaa.omer2009@gmail.com"
                       
                    },
                });
            });

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

            // Enable middleware to serve swagger-ui (HTML, JS, CSS, etc.),
            // specifying the Swagger JSON endpoint.
            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "Messages API V1");

                // To serve SwaggerUI at application's root page, set the RoutePrefix property to an empty string.
                c.RoutePrefix = string.Empty;
            });

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

            app.UseHttpsRedirection();

            app.UseRouting();

            app.UseAuthorization();

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