Discord.Net/samples/02_commands_framework/Program.cs

using System;
using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Discord;
using Discord.WebSocket;
using Discord.Commands;
using _02_commands_framework.Services;

namespace _02_commands_framework
{
    // This is a minimal example of using Discord.Net's command
    // framework - by no means does it show everything the framework
    // is capable of.
    //
    // You can find samples of using the command framework:
    // - Here, under the 02_commands_framework sample
    // - https://github.com/foxbot/DiscordBotBase - a barebones bot template
    // - https://github.com/foxbot/patek - a more feature-filled bot, utilizing more aspects of the library
    class Program
    {
        static void Main(string[] args)
            => new Program().MainAsync().GetAwaiter().GetResult();

        public async Task MainAsync()
        {
            var services = ConfigureServices();

            var client = services.GetRequiredService<DiscordSocketClient>();

            client.Log += LogAsync;
            services.GetRequiredService<CommandService>().Log += LogAsync;

            await client.LoginAsync(TokenType.Bot, Environment.GetEnvironmentVariable("token"));
            await client.StartAsync();

            await services.GetRequiredService<CommandHandlingService>().InitializeAsync();

            await Task.Delay(-1);
        }

        private Task LogAsync(LogMessage log)
        {
            Console.WriteLine(log.ToString());

            return Task.CompletedTask;
        }

        private IServiceProvider ConfigureServices()
        {
            return new ServiceCollection()
                .AddSingleton<DiscordSocketClient>()
                .AddSingleton<CommandService>()
                .AddSingleton<CommandHandlingService>()
                .AddSingleton<HttpClient>()
                .AddSingleton<PictureService>()
                .BuildServiceProvider();
        }
    }
}