Program.cs

using pokedex.Services;
using pokedex.Settings;
using MongoDB.Driver;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.Configure<MongoDbSettings>(
    builder.Configuration.GetSection("MongoDbSettings"));
builder.Services.AddSingleton<IMongoClient>(sp =>
    new MongoClient(builder.Configuration.GetValue<string>("MongoDbSettings:ConnectionString")));
builder.Services.AddSingleton<IPokemonService, PokemonService>();
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseAuthorization();
app.MapControllers();
app.Run();