A managed implementation of Native Wifi API

• Windows 7 or newer
• .NET Framework 4.5.2

Available methods including asynchronous ones based on TAP.

To check SSIDs of currently available wireless LANs, call EnumerateAvailableNetworkSsids method.

public static IEnumerable<string> EnumerateNetworkSsids()
{
    return NativeWifi.EnumerateAvailableNetworkSsids()
        .Select(x => x.ToString()); // UTF-8 string representation
}

In general, a SSID is represented by a UTF-8 string but it is not guaranteed. So if ToString method seems not to produce a valid value, try ToBytes method instead.

To connect to a wireless LAN, call ConnectNetworkAsync asynchronous method.

public static async Task<bool> ConnectAsync()
{
    var availableNetwork = NativeWifi.EnumerateAvailableNetworks()
        .Where(x => !string.IsNullOrWhiteSpace(x.ProfileName))
        .OrderByDescending(x => x.SignalQuality)
        .FirstOrDefault();

    if (availableNetwork is null)
        return false;

    return await NativeWifi.ConnectNetworkAsync(
        interfaceId: availableNetwork.Interface.Id,
        profileName: availableNetwork.ProfileName,
        bssType: availableNetwork.BssType,
        timeout: TimeSpan.FromSeconds(10));
}

This method returns true if successfully connected to the wireless LAN in contrast to its synchronous sibling, ConnectNetwork method, returns true if the request for the connection succeeds and doesn't indicate the result.

To refresh currently available wireless LANs, call ScanNetworksAsync method.

public static Task RefreshAsync()
{
    return NativeWifi.ScanNetworksAsync(timeout: TimeSpan.FromSeconds(10));
}

This method requests wireless interfaces to scan wireless LANs in parallel. It takes no more than 4 seconds.

To delete an existing wireless profile, use DeleteProfile method. Please note that a profile name is case-sensitive.

public static bool DeleteProfile(string profileName)
{
    var targetProfile = NativeWifi.EnumerateProfiles()
        .Where(x => profileName.Equals(x.Name, StringComparison.Ordinal))
        .FirstOrDefault();

    if (targetProfile is null)
        return false;

    return NativeWifi.DeleteProfile(
        interfaceId: targetProfile.Interface.Id,
        profileName: profileName);
}

To check wireless LAN channels that are already used by surrounding access points, call EnumerateBssNetworks method and filter the results by signal strength.

public static IEnumerable<int> EnumerateNetworkChannels(int signalStrengthThreshold)
{
    return NativeWifi.EnumerateBssNetworks()
        .Where(x => x.SignalStrength > signalStrengthThreshold)
        .Select(x => x.Channel);
}

To turn on the radio of a wireless interface, check the current radio state by GetInterfaceRadio method and then call TurnOnInterfaceRadio method.

public static async Task<bool> TurnOnAsync()
{
    var targetInterface = NativeWifi.EnumerateInterfaces()
        .FirstOrDefault(x =>
        {
            var radioSet = NativeWifi.GetInterfaceRadio(x.Id)?.RadioSets.FirstOrDefault();
            if (radioSet is null)
                return false;

            if (!radioSet.HardwareOn.GetValueOrDefault()) // Hardware radio state is off.
                return false;

            return (radioSet.SoftwareOn == false); // Software radio state is off.
        });

    if (targetInterface is null)
        return false;

    try
    {
        return await Task.Run(() => NativeWifi.TurnOnInterfaceRadio(targetInterface.Id));
    }
    catch (UnauthorizedAccessException)
    {
        return false;
    }
}

Please note that this method can only change software radio state and if hardware radio state is off (like hardware Wi-Fi switch is at off position), the radio cannot be turned on programatically.

Ver 1.8 2020-12-20

• Breaking change: GetInterfaceAutoConfig is renamed to IsInterfaceAutoConfig

Ver 1.7 2020-9-29

• Add: WPA3 in authentication method and algorithm

Ver 1.6 2020-8-4

• Add: Functionality to connect specific access point when connecting network

Ver 1.5 2019-12-1

• Add: Information obtained by EnumerateAvailableNetworks and EnumerateAvailableNetworkGroups include authentication/cipher algorithms

Ver 1.4 2018-9-2

• Add: Methods to provide additional information; EnumerateInterfaceConnections, EnumerateAvailableNetworkGroups, EnumerateProfileRadios
• Breaking change: Radio information related to wireless profiles can be obtained by EnumerateProfileRadios instead of EnumerateProfiles

Ver 1.0 2015-1-30

• Initial commit

• MIT License