docs: update command sample to use CommandExecuted, Log

samples/02_commands_framework/Services/CommandHandlingService.cs

@@ -20,6 +20,8 @@ namespace _02_commands_framework.Services
             _discord = services.GetRequiredService<DiscordSocketClient>();
             _services = services;
 
+            _commands.CommandExecuted += CommandExecutedAsync;
+            _commands.Log += LogAsync;
             _discord.MessageReceived += MessageReceivedAsync;
         }
 
@@ -39,11 +41,28 @@ namespace _02_commands_framework.Services
             if (!message.HasMentionPrefix(_discord.CurrentUser, ref argPos)) return;
 
             var context = new SocketCommandContext(_discord, message);
-            var result = await _commands.ExecuteAsync(context, argPos, _services);
+            await _commands.ExecuteAsync(context, argPos, _services); // we will handle the result in CommandExecutedAsync
+        }
+
+        public async Task CommandExecutedAsync(Optional<CommandInfo> command, ICommandContext context, IResult result)
+        {
+            // command is unspecified when there was a search failure (command not found); we don't care about these errors
+            if (!command.IsSpecified)
+                return;
+
+            // the command was succesful, we don't care about this result, unless we want to log that a command succeeded.
+            if (result.IsSuccess)
+                return;
+
+            // the command failed, let's notify the user that something happened.
+            await context.Channel.SendMessageAsync($"error: {result.ToString()}");
+        }
+
+        private Task LogAsync(LogMessage log)
+        {
+            Console.WriteLine(log.ToString());
 
-            if (result.Error.HasValue &&
-                result.Error.Value != CommandError.UnknownCommand) // it's bad practice to send 'unknown command' errors
-                await context.Channel.SendMessageAsync(result.ToString());
+            return Task.CompletedTask;
         }
     }
 }