Startup.cs

using ExpenseTracker.DAL;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace ExpenseTracker
{
    public class Startup
    {
        private readonly IWebHostEnvironment env;

        public Startup(IConfiguration configuration, IWebHostEnvironment env)
        {
            Configuration = configuration;
            this.env = env;
        }

        public IConfiguration Configuration { get; }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddApplicationInsightsTelemetry();

            services.AddControllers();
            if (env.IsDevelopment() || env.IsProduction()) // TODO: define production datacontext and cors policy
            {
                services.AddDbContext<ExpenseTrackerContext>(options => options.UseSqlite($"Data Source=expensetracker.db"));
                services.AddCors(o => o.AddPolicy("AllowAll", builder => // TODO: Restrict from 'allow all'
                {
                    builder.AllowAnyOrigin()
                            .AllowAnyMethod()
                            .AllowAnyHeader();
                }));
            }
            services.AddSwaggerGen();
        }

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment() || env.IsProduction())
            {
                app.UseDeveloperExceptionPage();
                UpdateDatabase(app);
            }

            app.UseSwagger();
            app.UseSwaggerUI(c =>
            {
                c.SwaggerEndpoint("/swagger/v1/swagger.json", "My API V1");
            });

            app.UseHttpsRedirection();

            app.UseRouting();
            app.UseCors("AllowAll");

            app.UseAuthorization();

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

        private static void UpdateDatabase(IApplicationBuilder app)
        {
            using (var serviceScope = app.ApplicationServices
                .GetRequiredService<IServiceScopeFactory>()
                .CreateScope())
            {
                using (var context = serviceScope.ServiceProvider.GetService<ExpenseTrackerContext>())
                {
                    context.Database.EnsureCreated();
                }
            }
        }
    }
}