System.GC.GetGenerationWR C# (CSharp) Method

        private static extern int GetGenerationWR(IntPtr handle);

        public static int GetGeneration(WeakReference wo)
        {
            int generationWr = GC.GetGenerationWR(wo.m_handle);

            GC.KeepAlive((object)wo);
            return(generationWr);
        }