例子：Bluetooth app to device sample

本例子演示了：

• 判断蓝牙是否打开，是通过一个HRsult值为0x8007048F的异常来判断的

catch (Exception ex)
            {
                if ((uint)ex.HResult == 0x8007048F)
                {
                    var result = MessageBox.Show(AppResources.Msg_BluetoothOff, "Bluetooth Off", MessageBoxButton.OKCancel);
                    if (result == MessageBoxResult.OK)
                    {
                        ShowBluetoothcControlPanel();
                    }
                }

• 找到所有配对设备 - Windows.Networking.Proximity.PeerFinder

                PeerFinder.AlternateIdentities["Bluetooth:Paired"] = "";
                var peers = await PeerFinder.FindAllPeersAsync();

• 尝试连接已配对设备

//从数据中获取已经选中的蓝牙设备，在ConnectToDevice方法中连接

            PairedDeviceInfo pdi = PairedDevicesList.SelectedItem as PairedDeviceInfo;
            PeerInformation peer = pdi.PeerInfo;

            // Asynchronous call to connect to the device
            ConnectToDevice(peer);

ConnectToDevice：

Windows.Networking.Sockets;

            try
            {
               Windows.Networking.Sockets.StreamSocket _socket = new StreamSocket();
                string serviceName = (String.IsNullOrWhiteSpace(peer.ServiceName)) ? tbServiceName.Text : peer.ServiceName;

                // Note: If either parameter is null or empty, the call will throw an exception
                await _socket.ConnectAsync(peer.HostName, serviceName);

                // If the connection was successful, the RemoteAddress field will be populated
               MessageBox.Show(String.Format(AppResources.Msg_ConnectedTo, _socket.Information.RemoteAddress.DisplayName));
            }

• 当捕获蓝牙未打开的异常，后打开蓝牙设置页面：（Microsoft.Phone.Tasks）

        private void ShowBluetoothcControlPanel()
        {
            ConnectionSettingsTask connectionSettingsTask = new ConnectionSettingsTask();
            connectionSettingsTask.ConnectionSettingsType = ConnectionSettingsType.Bluetooth;
            connectionSettingsTask.Show();
        }