CRM2011 将Query查询转化为FetchXml

public static string QueryExpressionToFetchExpression(IOrganizationService service,QueryExpression query)
        {
            QueryExpressionToFetchXmlRequest request = new QueryExpressionToFetchXmlRequest();
            request.Query = query;
            QueryExpressionToFetchXmlResponse response =
                                            (QueryExpressionToFetchXmlResponse)service.Execute(request);
            return response.FetchXml;
        }