如何让我的命令在Discord.Net中工作

using Discord;
using Discord.Commands;
using Discord.WebSocket;
using System;
using System.Reflection;
using System.Threading.Tasks;

public class Program
{
    private DiscordSocketClient _client;
    private CommandService _commands;
    private IServiceProvider _services;

    public static void Main(string[] args) => new Program().RunBotAsync().GetAwaiter().GetResult();

    public async Task RunBotAsync()
    {
        _client = new DiscordSocketClient();
        _commands = new CommandService();
        
        await RegisterCommandsAsync();
        
        await _client.LoginAsync(TokenType.Bot, "YOUR_BOT_TOKEN");
        
        await _client.StartAsync();
        
        await Task.Delay(-1);
    }

    public async Task RegisterCommandsAsync()
    {
        _client.MessageReceived += HandleCommandAsync;
        await _commands.AddModulesAsync(Assembly.GetEntryAssembly(), _services);
    }

    private async Task HandleCommandAsync(SocketMessage arg)
    {
        var message = arg as SocketUserMessage;
        var context = new SocketCommandContext(_client, message);
        
        if (message.Author.IsBot) return;
        
        int argPos = 0;
        if (message.HasStringPrefix("!", ref argPos))
        {
            var result = await _commands.ExecuteAsync(context, argPos, _services);
            if (!result.IsSuccess) Console.WriteLine(result.ErrorReason);
        }
    }
}

using Discord.Commands;
using System.Threading.Tasks;

public class MyCommands : ModuleBase<SocketCommandContext>
{
    [Command("hello")]
    public async Task HelloCommand()
    {
        await ReplyAsync("Hello, World!");
    }
}

public async Task RegisterCommandsAsync()
{
    _client.MessageReceived += HandleCommandAsync;
    await _commands.AddModuleAsync<MyCommands>(_services);
}