System.Xml.Xsl.Runtime.XmlSortKeyAccumulator.AppendSortKey C# (CSharp) Method

        private void AppendSortKey(XmlSortKey key)
        {
            // Ensure that sort will be stable by setting index of key
            key.Priority = _pos;

            if (_keys[_pos] == null)
                _keys[_pos] = key;
            else
                _keys[_pos].AddSortKey(key);
        }