Zeroconf.ResolveAsync被冻结

Question

我尝试使用Zeroconf来获取所有设备。当我调用ResolveAsync时，代码被冻结了。

我在Android手机上运行Xamarin Form。它没有产生任何错误或力量关闭。它就在那里。

public async Task Update()
    {
        DeviceInfoStruct device;
        string service = Constant.LAUNCHER_THRIFT_SERVICE + "local.";
        int tried = 0;
        List<DeviceInfoStruct> toDelete = new List<DeviceInfoStruct>();
        foreach (var d in _devices)
        {
            toDelete.Add(d);
        }
        try
        {
            if (IsHotSpotIp())
            {
                device = LauncherClient.GetDeviceInfo(Constant.HOTSPOT_DEVICE_IP);
                if (device != null)
                {
                    device.Ip = Constant.HOTSPOT_DEVICE_IP;
                    if (!_devices.Any(d => d.Ip == device.Ip))
                    {
                        _devices.Add(device);
                    }
                }
            }
            do
            {
                for (int i = 0; i < 5; i++)
                {
                    foreach (var r in await ZeroconfResolver.ResolveAsync(service))
                    {
                        if (r.Services.ContainsKey(service))
                        {
                            device = LauncherClient.GetDeviceInfo(r.IPAddress);
                            if (device != null)
                            {
                                device.Ip = r.IPAddress;
                                if (!_devices.Any(d => d.Ip == device.Ip))
                                {
                                    Debug.WriteLine("Found Device " + device.DeviceName + " @ " + device.Ip);
                                    _devices.Add(device);
                                    toDelete.RemoveAll(d => d.Ip == device.Ip);
                                }
                            }
                        }
                    }
                }
                tried++;
            } while ((tried < 2) && (_devices.Count == 0));

            foreach (var d in toDelete)
            {
                if (LauncherClient.GetDeviceInfo(d.Ip) == null)
                {
                    _devices.Remove(d);
                }
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }

来自GitHub的锁定

buttonHosting.Command = new Command( () =>
        {

            #if __ANDROID__

            var wifi = (Android.Net.Wifi.WifiManager)Android.App.Application.Context.GetSystemService(Android.Content.Context.WifiService);
            var mlock = wifi.CreateMulticastLock("Zeroconf lock");

               try
               {
                   mlock.Acquire();

                   var deviceModel = new DevicesViewModel();
                   var devices = deviceModel.GetAvailableDevicesAsync().Result;

                   foreach (var device in devices)
                   {
                       System.Diagnostics.Debug.WriteLine("Device Info: Name = " + device.DeviceName);
                       System.Diagnostics.Debug.WriteLine("             Version = " + device.DeviceVersion);
                   }
               }
               finally
               {
                   mlock.Release();
               }
            #endif

            //await Navigation.PushAsync(new MeetingPage(), true);
        });

以下代码只会打印设备列表

ILookup<string, string> domains = await ZeroconfResolver.BrowseDomainsAsync();
        var responses = await ZeroconfResolver.ResolveAsync(domains.Select(g => g.Key));
        foreach (var resp in responses)
            Console.WriteLine(resp);

我只能看到其他设备，但不是我想看的那个......