//注入  按單例模式注入RabbitMQ的ConnectionFactory
{
    var mqCfg = context.Configuration.GetSection("RabbitMQ").Get<RabbitMQCfg>();
    var cf = new ConnectionFactory()
    {
        HostName = mqCfg.HostName,
        Port = mqCfg.Port,

        UserName = mqCfg.UserName,
        Password = mqCfg.Password,

        VirtualHost = mqCfg.VirtualHost,
    };

    RabbitMQTools.Init(cf);

    services.AddSingleton(cf);
}
{
    var mqCfg = context.Configuration.GetSection("RabbitMQLogger").Get<MyRabbitMQLoggerProviderOptions>();
    var cf = new ConnectionFactory()
    {
        HostName = mqCfg.HostName,
        Port = mqCfg.Port,

        UserName = mqCfg.UserName,
        Password = mqCfg.Password,

        VirtualHost = mqCfg.VirtualHost,
    };

    RabbitMQTools.Init(cf);

    services.AddSingleton(cf);
}

/// <summary></summary>
public TimedBackgroundService(IEnumerable<ConnectionFactory> svs)
{

}

using (var sp = logbuild.Services.BuildServiceProvider())
{
    var mqFact2 = sp.GetServices<ConnectionFactory>();
    var mqFact = mqFact2.First(d => d.VirtualHost.EqualIgnoreCase("log"));
    var option = sp.GetService<IConfiguration>().GetSection("RabbitMQLogger").Get<MyRabbitMQLoggerProviderOptions>();

    logbuild.AddMyRabbitMQLog(mqFact, option);
}

[AspectCore.DependencyInjection.FromServiceContext]
private IEnumerable<ConnectionFactory>  svc { get; set; }