System.Xml.XmlTextReaderImpl.MoveOffEntityReference C# (CSharp) Method

        internal void MoveOffEntityReference()
        {
            if (_outerReader.NodeType == XmlNodeType.EntityReference &&
                 _parsingFunction == ParsingFunction.AfterResolveEntityInContent)
            {
                if (!_outerReader.Read())
                {
                    throw new InvalidOperationException(SR.Xml_InvalidOperation);
                }
            }
        }

 public override string ReadString()
 {
     _impl.MoveOffEntityReference();
     return(base.ReadString());
 }