Helper class to return the correct CultureInfo in UWP apps

CultureInfoHelper.cs

using System.Globalization;
using System.Runtime.InteropServices;
using System.Text;

public class CultureInfoHelper
{
    [DllImport("api-ms-win-core-localization-l1-2-0.dll", CharSet = CharSet.Unicode)]
    private static extern int GetLocaleInfoEx(string lpLocaleName, uint LCType, StringBuilder lpLCData, int cchData);

    private const uint LOCALE_SNAME = 0x0000005c;
    private const string LOCALE_NAME_USER_DEFAULT = null;
    private const string LOCALE_NAME_SYSTEM_DEFAULT = "!x-sys-default-locale";

    private const int BUFFER_SIZE = 530;

    public static CultureInfo GetCurrentCulture()
    {
        var name = InvokeGetLocaleInfoEx(LOCALE_NAME_USER_DEFAULT, LOCALE_SNAME);

        if (name == null)
        {
            name = InvokeGetLocaleInfoEx(LOCALE_NAME_SYSTEM_DEFAULT, LOCALE_SNAME);

            if (name == null)
            {
                // If system default doesn't work, use invariant
                return CultureInfo.InvariantCulture;
            }
        }

        return new CultureInfo(name);
    }

    private static string InvokeGetLocaleInfoEx(string lpLocaleName, uint LCType)
    {
        var buffer = new StringBuilder(BUFFER_SIZE);

        var resultCode = GetLocaleInfoEx(lpLocaleName, LCType, buffer, BUFFER_SIZE);

        if (resultCode > 0)
        {
            return buffer.ToString();
        }

        return null;
    }
}