c# - 给定已连接且就绪的 DiscordSocketClient 和 Discord Channel Id，如何向该 channel 发送消息？

Question

我正在尝试设置自动消息。

当我设置我的客户端时，我使用:

client.Ready += OnClientReady;

从那里开始我的 Scheduler 类:

private Task OnClientReady()
{
    var scheduler = new Scheduler(client);
    scheduler.Start();

    return Task.CompletedTask;
}

看起来像这样:

public class Scheduler
{
    private readonly DiscordSocketClient _client;
    private static Timer _timer;

    public void Start(object state = null)
    {
        Sender.Send(_client);

        _timer = new Timer(Start, null, (int)Duration.FromMinutes(1).TotalMilliseconds, 0);
    }

    public Scheduler(DiscordSocketClient client)
    {
        _client = client;
    }
}

当计时器计时时，它会调用 client 并将其传递给下面的 Sender 类:

public static class Sender
{
    public static void Send(DiscordSocketClient client)
    {
        var currentLocalDateTime = SystemClock.Instance.InTzdbSystemDefaultZone().GetCurrentLocalDateTime();

        var elapsedRotations = new List<Rotations>();
        using (var db = new GOPContext())
        {
            elapsedRotations = db.Rotations
                                 .Include(r => r.RotationUsers)
                                 .Where(r => r.LastNotification == null ||
                                             Period.Between(r.LastNotification.Value.ToLocalDateTime(),
                                                            currentLocalDateTime).Hours >= 23)
                                 .ToList();
        }

        foreach (var rotation in elapsedRotations)
        {
            var zone = DateTimeZoneProviders.Tzdb.GetZoneOrNull(rotation.Timezone);
            var zonedDateTime = SystemClock.Instance.InZone(zone).GetCurrentZonedDateTime();
            if (zonedDateTime.Hour != 17)
                continue;

            //I need to send a message to the channel here.
            //I have access to the connected / ready client, 
            //and the channel Id which is "rotation.ChannelId"
        }
    }
}

我试过这样获取 channel :

var channel = client.GetChannel((ulong) rotation.ChannelId);

它给了我一个 SocketChannel 并且也是这样的:

var channel = client.Guilds
                    .SelectMany(g => g.Channels)
                    .SingleOrDefault(c => c.Id == rotation.ChannelId);

这给了我一个 SocketGuildChannel。这些都没有给我直接向 channel 发送消息的选项。我已经尝试研究如何做到这一点，但没有找到任何东西......文档似乎没有任何例子......

这似乎是一件简单的事情，但我对此束手无策。有人知道怎么做吗？

Answer 1

这是因为 SocketGuildChannel 和 SocketChannel 都可以是语音或文本 channel 。

相反，您需要 ISocketMessageChannel、IMessageChannel 或 SocketTextChannel

要得到这个，你可以简单地转换你得到的 SocketChannel

var channel = client.GetChannel((ulong) rotation.ChannelId);
var textChannel = channel as IMessageChannel;
if(textChannel == null)
    // this was not a text channel, but a voice channel
else
    textChannel.SendMessageAsync("This is a text channel");