View Mac Address of device in the settings page (UWP, Android, iOS)

OpenWifiSettings.cs

// This is a workaround to get the Mac address of a device. The user has to manually copy the MAC address from the device, 
// because you are not able to directly query the MAC from UWP, iOS and Android.

// Supported Platforms: UWP (Mobile & Desktop), Android, iOS


// In PCL
namespace Project.Interfaces
{
    /// <summary>
    /// Interface to implement a function to open wifi settings on each platform
    /// </summary>
    public interface IOpenWifiSettings
    {
        /// <summary>
        /// Opens wifi settings on the device
        /// </summary>
        void OpenWifiSettings();
    }
}
    
// Android

using Project.Droid.Helpers;
using Xamarin.Forms;

[assembly: Dependency(typeof(OpenWifiSettingsHelper))]
namespace Project.Droid.Helpers
{
    using System;
    using Android.Content;
    using WerDaXamarin.Interfaces;

    /// <summary>
    /// Implements <see cref="IOpenWifiSettings"/> to get into Wifi settings quickly on Android
    /// </summary>
    public class OpenWifiSettingsHelper : IOpenWifiSettings
    {
        /// <summary>
        /// Opens wifi settings on this Android device
        /// </summary>
        public void OpenWifiSettings()
        {
            try
            {
                using (var intent = new Intent(Android.Provider.Settings.ActionWifiSettings))
                {
                    Forms.Context.StartActivity(intent);
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex.Message);
                throw new InvalidOperationException("Opening Wifi settings was not possible");
           }
       }
   }
}
      
// iOS

using Project.IOS.Helpers;
using Xamarin.Forms;

[assembly: Dependency(typeof(OpenWifiSettingsHelper))]
namespace Project.IOS.Helpers
{
    using System;
    using System.Diagnostics;
    using Foundation;
    using UIKit;
    using WerDaXamarin.Interfaces;

    /// <summary>
    /// Implementation of <see cref="IOpenWifiSettings"/> on iOS
    /// </summary>
    public class OpenWifiSettingsHelper : IOpenWifiSettings
    {
        /// <summary>
        /// Opens the wifi settings on the device
        /// </summary>
        public void OpenWifiSettings()
        {
            try
            {
                var wifiUrl = new NSUrl("prefs:root=WIFI");
                if (UIApplication.SharedApplication.CanOpenUrl(wifiUrl))
                {
                    // Pre iOS 10
                    UIApplication.SharedApplication.OpenUrl(wifiUrl);
                }
                else
                {
                    // iOS 10
                    using (var nSUrl = new NSUrl("App-Prefs:root=WIFI"))
                    {
                        UIApplication.SharedApplication.OpenUrl(nSUrl);
                    }
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
                throw new InvalidOperationException("Could not open Wifi Settings");
            }
        }
    }
}
      
 // UWP
 
using Project.UWP.Helpers;
using Xamarin.Forms;

[assembly: Dependency(typeof(OpenWifiSettingsHelper))]
namespace Project.UWP.Helpers
{
    using System;
    using WerDaXamarin.Interfaces;
    using Windows.System.Profile;

    /// <summary>
    /// Implements <see cref="OpenWifiSettingsHelper"/> to open wifi settings on UWP
    /// </summary>
    public class OpenWifiSettingsHelper : IOpenWifiSettings
    {
        /// <summary>
        /// Opens wifi settings on this Windows device
        /// </summary>
        public void OpenWifiSettings()
        {
            // Open the about page when on Windows 10 Mobile, because you find the MAC address there.
            var success = AnalyticsInfo.VersionInfo.DeviceFamily == "Windows.Mobile" ?
                Windows.System.Launcher.LaunchUriAsync(new Uri("ms-settings:about")).GetAwaiter().GetResult() :
                Windows.System.Launcher.LaunchUriAsync(new Uri("ms-settings:network-wifi")).GetAwaiter().GetResult();

            if (!success)
            {
                throw new InvalidOperationException("Could not open Wifi settings");
            }
        }
    }
}

// Usage in PCL

private static void ExecuteOpenWifiSettingsCommand()
{
     try
     {
        DependencyService.Get<IOpenWifiSettings>().OpenWifiSettings();
     }
     catch (InvalidOperationException invopex)
     {
        // Catch the exception
     }
}