How do I get the available wifi APs and their signal strength in .net?

Question

Is there any way to access all WiFi access points and their respective RSSI values using .NET? It would be really nice if I could do it without using unmanaged code or even

Answer 1

I am doing it running a command netsh wlan show networks mode=bssid from C# code.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class AccessPoint
    {
        public string SSID { get; set; }
        public string BSSID { get; set; }
        public byte Signal { get; set; }
    }

    class Program
    {
        private static async Task Main(string[] args)
        {
            var apList = await GetSignalOfNetworks();

            foreach (var ap in apList)
            {
                WriteLine($"{ap.BSSID} - {ap.Signal} - {ap.SSID}");
            }

            Console.ReadKey();
        }

        private static async Task<AccessPoint[]> GetSignalOfNetworks()
        {
            string result = await ExecuteProcessAsync(@"C:\Windows\System32\netsh.exe", "wlan show networks mode=bssid");

            return Regex.Split(result, @"[^B]SSID \d+").Skip(1).SelectMany(network => GetAccessPointFromNetwork(network)).ToArray();
        }

        private static AccessPoint[] GetAccessPointFromNetwork(string network)
        {
            string withoutLineBreaks = Regex.Replace(network, @"[\r\n]+", " ").Trim();
            string ssid = Regex.Replace(withoutLineBreaks, @"^:\s+(\S+).*$", "$1").Trim();

            return Regex.Split(withoutLineBreaks, @"\s{4}BSSID \d+").Skip(1).Select(ap => GetAccessPoint(ssid, ap)).ToArray();
        }

        private static AccessPoint GetAccessPoint(string ssid, string ap)
        {
            string withoutLineBreaks = Regex.Replace(ap, @"[\r\n]+", " ").Trim();
            string bssid = Regex.Replace(withoutLineBreaks, @"^:\s+([a-f0-9]{2}(:[a-f0-9]{2}){5}).*$", "$1").Trim();
            byte signal = byte.Parse(Regex.Replace(withoutLineBreaks, @"^.*(Signal|Sinal)\s+:\s+(\d+)%.*$", "$2").Trim());

            return new AccessPoint
            {
                SSID = ssid,
                BSSID = bssid,
                Signal = signal,
            };
        }

        private static async Task<string> ExecuteProcessAsync(string cmd, string args = null)
        {
            var process = new Process()
            {
                StartInfo = new ProcessStartInfo
                {
                    FileName = cmd,
                    Arguments = args,
                    RedirectStandardInput = false,
                    RedirectStandardOutput = true,
                    RedirectStandardError = true,
                    UseShellExecute = false,
                    CreateNoWindow = true,
                    StandardOutputEncoding = Encoding.UTF8,
                }
            };

            process.Start();

            string result = await process.StandardOutput.ReadToEndAsync();

            process.WaitForExit();

#if DEBUG
            if (result.Trim().Contains("The Wireless AutoConfig Service (wlansvc) is not running."))
            {
                return await GetFakeData();
            }
#endif

            return result;
        }

        private static async Task<string> GetFakeData()
        {
            var assembly = Assembly.GetExecutingAssembly();
            var resourceName = "ConsoleApp2.FakeData.txt";

            using (Stream stream = assembly.GetManifestResourceStream(resourceName))
            using (StreamReader reader = new StreamReader(stream))
            {
                return await reader.ReadToEndAsync();
            }
        }

        private static void WriteLine(string str)
        {
            Console.WriteLine(str);
        }
    }
}