Discord.Net/samples/ShardedClient/Services/InteractionHandlingService.cs

using Discord;
using Discord.Interactions;
using Discord.WebSocket;

using Microsoft.Extensions.DependencyInjection;

using System;
using System.Threading.Tasks;

namespace ShardedClient.Services;

public class InteractionHandlingService
{
    private readonly InteractionService _service;
    private readonly DiscordShardedClient _client;
    private readonly IServiceProvider _provider;

    public InteractionHandlingService(IServiceProvider services)
    {
        _service = services.GetRequiredService<InteractionService>();
        _client = services.GetRequiredService<DiscordShardedClient>();
        _provider = services;

        _service.Log += LogAsync;
        _client.InteractionCreated += OnInteractionAsync;
        _client.ShardReady += ReadyAsync;
        // For examples on how to handle post execution,
        // see the InteractionFramework samples.
    }

    // Register all modules, and add the commands from these modules to either guild or globally depending on the build state.
    public async Task InitializeAsync()
    {
        await _service.AddModulesAsync(typeof(InteractionHandlingService).Assembly, _provider);
    }

    private async Task OnInteractionAsync(SocketInteraction interaction)
    {
        _ = Task.Run(async () =>
        {
            var context = new ShardedInteractionContext(_client, interaction);
            await _service.ExecuteCommandAsync(context, _provider);
        });
        await Task.CompletedTask;
    }

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

        return Task.CompletedTask;
    }

    private bool _hasRegistered = false;

    private async Task ReadyAsync(DiscordSocketClient _)
    {
        // ShardReady is called for each shard; to avoid getting ratelimited we only want to register commands once.
        if (!_hasRegistered)
        {
            await _service.RegisterCommandsGloballyAsync();
            _hasRegistered = true;
        }
    }
}