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

        public override IPermission Copy() { return this; }
        public override bool Equals(object o) => base.Equals(o);

        public override IPermission Intersect(IPermission target)
        {
            FileIOPermission fiop = Cast(target);

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

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

            FileIOPermission result = new FileIOPermission(PermissionState.None);

            result.AllFiles      = m_AllFilesAccess & fiop.AllFiles;
            result.AllLocalFiles = m_AllLocalFilesAccess & fiop.AllLocalFiles;

            IntersectKeys(readList, fiop.readList, result.readList);
            IntersectKeys(writeList, fiop.writeList, result.writeList);
            IntersectKeys(appendList, fiop.appendList, result.appendList);
            IntersectKeys(pathList, fiop.pathList, result.pathList);

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