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

        public string[] GetPathList(FileIOPermissionAccess access) { return null; }
        public override IPermission Intersect(IPermission target) { return default(IPermission); }

        public override IPermission Union(IPermission other)
        {
            FileIOPermission fiop = Cast(other);

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

            if (IsUnrestricted() || fiop.IsUnrestricted())
            {
                return(new FileIOPermission(PermissionState.Unrestricted));
            }

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

            FileIOPermission result = (FileIOPermission)Copy();

            result.AllFiles      |= fiop.AllFiles;
            result.AllLocalFiles |= fiop.AllLocalFiles;

            string[] paths = fiop.GetPathList(FileIOPermissionAccess.Read);
            if (paths != null)
            {
                UnionKeys(result.readList, paths);
            }

            paths = fiop.GetPathList(FileIOPermissionAccess.Write);
            if (paths != null)
            {
                UnionKeys(result.writeList, paths);
            }

            paths = fiop.GetPathList(FileIOPermissionAccess.Append);
            if (paths != null)
            {
                UnionKeys(result.appendList, paths);
            }

            paths = fiop.GetPathList(FileIOPermissionAccess.PathDiscovery);
            if (paths != null)
            {
                UnionKeys(result.pathList, paths);
            }

            return(result);
        }