initial

CommandHandler.cs

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+using Discord;
+using Discord.Commands;
+using Discord.WebSocket;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace KasinoBot
+{
+    public class CommandHandler
+    {
+        private readonly CommandService _commands;
+        private readonly DiscordSocketClient _discord;
+        private readonly IServiceProvider _services;
+
+        public CommandHandler(IServiceProvider services)
+        {
+            _commands = services.GetRequiredService<CommandService>();
+            _discord = services.GetRequiredService<DiscordSocketClient>();
+            _services = services;
+
+            _commands.CommandExecuted += CommandExecutedAsync;
+            _discord.MessageReceived += MessageReceivedAsync;
+        }
+
+        public async Task InitializeAsync()
+        {
+            await _commands.AddModulesAsync(Assembly.GetEntryAssembly(), _services);
+        }
+
+        public async Task MessageReceivedAsync(SocketMessage rawMessage)
+        {
+            if (!(rawMessage is SocketUserMessage message))
+                return;
+            if (message.Source != MessageSource.User)
+                return;
+
+            var argPos = 0;
+            if (!message.HasCharPrefix('~', ref argPos))
+                return;
+
+            var context = new SocketCommandContext(_discord, message);
+            await _commands.ExecuteAsync(context, argPos, _services);
+        }
+
+        public async Task CommandExecutedAsync(Optional<CommandInfo> command, ICommandContext context, IResult result)
+        {
+            if (!command.IsSpecified)
+                return;
+
+            if (result.IsSuccess)
+                return;
+
+            Console.WriteLine($"[{context.User.Username} | {context.Guild.Name}] Command error: {result}");
+            await context.Channel.SendMessageAsync($"Command error: {result}");
+        }
+    }
+}