public static class WindowsMemory
{

    public static double GetMemoryUsage()
    {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
        {
            MEMORYSTATUSEX memoryStatus = new MEMORYSTATUSEX();
            memoryStatus.dwLength = (uint)Marshal.SizeOf(typeof(MEMORYSTATUSEX));

            if (GlobalMemoryStatusEx(ref memoryStatus) == false)
            {
                return 0;
            }

            return Math.Round((float)(memoryStatus.ullTotalPhys - memoryStatus.ullAvailPhys) / memoryStatus.ullTotalPhys * 100f, 2);
        }
        return 0;
    }

    [DllImport("kernel32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    public static extern bool GlobalMemoryStatusEx(ref MEMORYSTATUSEX lpBuffer);

    [StructLayout(LayoutKind.Sequential)]
    public struct MEMORYSTATUSEX
    {
        public uint dwLength;
        public uint dwMemoryLoad;
        public ulong ullTotalPhys;
        public ulong ullAvailPhys;
        public ulong ullTotalPageFile;
        public ulong ullAvailPageFile;
        public ulong ullTotalVirtual;
        public ulong ullAvailVirtual;
        public ulong ullAvailExtendedVirtual;
    }
}