How to get a list of ports asynchronously?

Trying to get a list of COM ports in the UWP . I write the list of ports to the variable dis , but it immediately goes to the next line, although there is await . How to make await wait for all ports to return correctly?

 try { string devSel = SerialDevice.GetDeviceSelector(); var dis = await DeviceInformation.FindAllAsync(devSel); for (int i = 0; i < dis.Count; i++) { lst.Add(dis[i]); } serialPort = await SerialDevice.FromIdAsync(lst[0].Id); } catch (Exception ex) { }