当用户添加反应时指定角色(C#Discord.net)

Question

我想在有人单击"；OK"；反应，使用不和API。然而，我在代码的第43行遇到了一个错误(如下所示(。

控制台日志：

Discord.WebSocket.DiscordSocketClient[0]
Gateway: A ReactionAdded handler has thrown an unhandled exception.
System.InvalidOperationException: This property has no value set.
at Discord.Optional`1.get_Value()
at Template.Services.CommandHandler.OnReactionAdded(Cacheable`2 arg1, ISocketMessageChannel arg2, SocketReaction arg3) in C:UsersPaulSourceReposDiscord.NET-TemplateTemplateServicesCommandHandler.cs:line 43
at Discord.EventExtensions.InvokeAsync[T1,T2,T3](AsyncEvent`1 eventHandler, T1 arg1, T2 arg2, T3 arg3)

我的代码：

public override async Task InitializeAsync(CancellationToken cancellationToken)
{
_client.MessageReceived += OnMessageReceived;
_service.CommandExecuted += OnCommandExecuted;
_client.ReactionAdded += OnReactionAdded;
await _service.AddModulesAsync(Assembly.GetEntryAssembly(), _provider);
}
private async Task OnReactionAdded(Cacheable<IUserMessage, ulong> arg1, ISocketMessageChannel arg2, SocketReaction arg3)
{
if (arg3.MessageId != 842517264716136469) return;
if (arg3.Emote.Name != "✅") return;
var role = (arg2 as SocketGuildChannel).Guild.GetRole(842522201881837585);
await (arg3.User.Value as SocketGuildUser).AddRoleAsync(role); //This is line 43
}

这个arg3.User.Value表达式有问题。我很乐意在这个问题上得到任何帮助。

Answer 1

代码是正确的。有必要在机器人程序配置中启用网关意图。

这些，位于https://discord.com/developers/applications/

屏幕截图：Bot配置