System.Security.SecurityElement.FromString C# (CSharp) Method

        public static SecurityElement FromString(string xml)
        {
            if (xml == null)
                throw new ArgumentNullException(nameof(xml));

            return default(SecurityElement);
        }

        //
        // Utility methods to construct the permission set objects from the well known XML and any permission
        // set extensions if necessary
        //

        private static NamedPermissionSet GetOrDeserializeExtendablePermissionSet(ref NamedPermissionSet permissionSet,
                                                                                  string permissionSetXml
#if FEATURE_CAS_POLICY
                                                                                  , string extensionXml
#endif // FEATURE_CAS_POLICY
                                                                                  )
        {
            Contract.Requires(!String.IsNullOrEmpty(permissionSetXml));
#if FEATURE_CAS_POLICY
            Contract.Requires(!String.IsNullOrEmpty(extensionXml));
#endif // FEATURE_CAS_POLICY

            if (permissionSet == null)
            {
#if FEATURE_CAS_POLICY
                SecurityElement    securityElement           = SecurityElement.FromString(permissionSetXml);
                NamedPermissionSet deserializedPermissionSet = new NamedPermissionSet(securityElement);

                PermissionSet extensions = GetPermissionSetExtensions(extensionXml);
                deserializedPermissionSet.InplaceUnion(extensions);

                permissionSet = deserializedPermissionSet;
#endif // FEATURE_CAS_POLICY
            }

            return(permissionSet.Copy() as NamedPermissionSet);
        }