I want to enable/Disable (i.e. lock/unlock) the Bluetooth through the C# wpf Application

Question

Hi

I want to enable/disable the Bluetooth programmatically in c# .NET WPF app.

I am not able to find correct implementation.

Pls help.

Answer 1

Hi @Vishal2 Bansal ,

.NET does not provide built-in APIs for directly controlling Bluetooth.

You can try using the Windows.Devices.Bluetooth namespace.

using System;
using System.Runtime.InteropServices;
using Windows.Devices.Bluetooth;
using Windows.Devices.Enumeration;

namespace BluetoothExample
{
    public class BluetoothManager
    {
        [DllImport("bthprops.cpl", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern int BluetoothEnableDiscovery(IntPtr hwndCaller, bool fEnabled);

        [DllImport("bthprops.cpl", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern int BluetoothEnableIncomingConnections(IntPtr hwndCaller, bool fEnabled);

        public static void EnableBluetooth()
        {
            BluetoothEnableDiscovery(IntPtr.Zero, true);
            BluetoothEnableIncomingConnections(IntPtr.Zero, true);
        }

        public static void DisableBluetooth()
        {
            BluetoothEnableDiscovery(IntPtr.Zero, false);
            BluetoothEnableIncomingConnections(IntPtr.Zero, false);
        }
    }
}

Best Regards.

Jiachen Li

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 2

This works for me (Windows 10 22H2, Microsoft.Windows.CsWinRT package) :

            {
                var result222 = await Radio.RequestAccessAsync();
                IReadOnlyList<Radio> radios = await Radio.GetRadiosAsync();
                Radio? BluetoothRadio = radios.FirstOrDefault(radio => radio.Kind == RadioKind.Bluetooth);
                RadioAccessStatus result;
                foreach (Radio module in radios)
                {
                    if (module.Kind == RadioKind.Bluetooth)
                    {
                        if (module.State == RadioState.Off)
                            result = await module.SetStateAsync(RadioState.On);

                        else
                            result = await module.SetStateAsync(RadioState.Off);
                    }
                }
            }