为什么StopAsync在停止IHost时两次被调用？

Question

我正在使用Discord.Net和Discord.Addons.Hosting软件包开发一个不和谐的机器人。由于某种原因，当我调用IHost.StopAsync()方法时，我的IHostedServices中的所有StopAsync方法都会被调用两次。

下面是其中一个StopAsync方法：

public override Task StopAsync(CancellationToken stoppingToken) 
{
    Logger.LogInformation("Client [{clientId}] is stopped.", Client.CurrentUser.Id);
    
    return base.StopAsync(stoppingToken);
}

我使用命令关闭我的机器人！关闭：

[Command("shutdown")]
[RequireUserPermission(GuildPermission.Administrator, Group = "Permission")]
[RequireOwner(Group = "Permission")]
public async Task Stop() 
{
    await _host.StopAsync();
}

以下是我试图关闭机器人时的日志：

[11:08:41 INF] Application is shutting down...
[11:08:46 INF] Client [1007213990742610001] is stopped.
[11:08:46 INF] Client [1007213990742610001] is stopped.
[11:08:46 INF] Discord.NET hosted service is stopping
[11:08:46 INF] Discord.NET hosted service is stopping
[11:08:46 INF] Gateway: Disconnecting

Answer 1

RunAsync itself calls StopAsync。如果要从主机内部停止主机，请调用IHostApplicationLifetime.StopApplication()而不是IHost.StopAsync()。