// 业务代码只看到类型化服务（方案 C）和作域（方案 B） using var lease = await auto.AcquireAsync("CAN-001", "CAN_Aging", ct); await canBus.SetAutoResponseAsync(lease, enabled:true); for (int i = 0; i < cycles; i++) { await canBus.SendFrameAsync(lease, 0x100 + i, data); var echo = await canBus.ReceiveFrameAsync(lease, ct); Verify(echo != null); // 断言 }