使用IServiceScopeFactory（按设计为单音调）安全、可控地解析其他服务。它是用于创建IServiceScope示例的工厂，具有在作用域内创建服务的唯一IServiceScope CreateScope()方法。释放此方法后，也将释放已从IServiceScope.ServiceProvider解析的任何作用域服务。
现实生活示例：

[HttpPost]
public IActionResult FooJob([FromServices] IServiceScopeFactory resolver, JobContract job)
{
    //long running task
    _ = Task.Run(async () =>
                {
                    using var scope = resolver.CreateScope();
                    var svcProvider = scope.ServiceProvider(); //Scopped lifetime
                    var mediator = svcProvider.GetService<IMediator>();
                    var request = RunFooJob.Command.Create(job);
                    return await mediator.Send(request);
                });
    return StatusCode(StatusCodes.Status200OK);            
}