private Expression<Func<TextContent, bool>> VisitInner(IExpression expression)
{
var visitor = new QueryExpressionTranslator();
visitor.Visite(expression);
//combine the order expressions.
this.OrderExpressions.AddRange(visitor.OrderExpressions);
this.CategoryQueries = this.CategoryQueries.Concat(visitor.CategoryQueries);
return visitor.LinqExpression;
}
