Question

我想在有人点击“确定”反应时使用 discord API 为用户分配角色。但是，我的代码第 43 行出现错误（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:\Users\Paul\Source\Repos\Discord.NET-Template\Template\Services\CommandHandler.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。我很乐意为这个问题提供任何帮助。

Answer 1

代码正确。有必要在机器人配置中启用网关意图。

这些，在 https://discord.com/developers/applications/ 的机器人标签下

截图：Bot Configuration

当用户添加反应时赋予角色 (C# Discord.net)

1 个答案: