System.Security.Permissions.RegistryPermission.Copy C# (CSharp) Method

        public override IPermission Copy()
        {
            return default(IPermission);
        }

        public override IPermission Intersect(IPermission target)
        {
            RegistryPermission rp = Cast(target);

            if (rp == null)
            {
                return(null);
            }

            if (IsUnrestricted())
            {
                return(rp.Copy());
            }
            if (rp.IsUnrestricted())
            {
                return(Copy());
            }

            RegistryPermission result = new RegistryPermission(PermissionState.None);

            IntersectKeys(createList, rp.createList, result.createList);
            IntersectKeys(readList, rp.readList, result.readList);
            IntersectKeys(writeList, rp.writeList, result.writeList);

            return(result.IsEmpty() ? null : result);
        }