System.Security.Permissions.EnvironmentPermission.GetPathList C# (CSharp) Method

        public string GetPathList(EnvironmentPermissionAccess flag)
        {
            return null;
        }

        public override IPermission Union(IPermission other)
        {
            EnvironmentPermission ep = Cast(other);

            if (ep == null)
            {
                return(Copy());
            }

            if (IsUnrestricted() || ep.IsUnrestricted())
            {
                return(new EnvironmentPermission(PermissionState.Unrestricted));
            }

            if (IsEmpty() && ep.IsEmpty())
            {
                return(null);
            }

            EnvironmentPermission result = (EnvironmentPermission)Copy();
            string path = ep.GetPathList(EnvironmentPermissionAccess.Read);

            if (path != null)
            {
                result.AddPathList(EnvironmentPermissionAccess.Read, path);
            }
            path = ep.GetPathList(EnvironmentPermissionAccess.Write);
            if (path != null)
            {
                result.AddPathList(EnvironmentPermissionAccess.Write, path);
            }
            return(result);
        }