use linq method wcf ria - silverlight

Question

i have this method in my domainService
public IQueryable Getbl()
{
var qer = from t in this.ObjectContext.lignes_bl
from t0 in this.ObjectContext.entete_bl
where
t.NO_BL == t0.NO_BL
orderby
t.NO_BL,
t.NO_LIGNE
select new
{
IDentete_bl = t0.IDENTETE_BL,
NO_BL = t0.NO_BL,
DATE_BL = t0.DATE_BL,
FAC_AVOIR = t0.FAC_AVOIR,
REF_BL = t0.REF_BL,
CODE_CLIENT = t0.CODE_CLIENT,
NOM_CLIENT = t0.NOM_CLIENT,
ADRESSE = t0.ADRESSE,
CODE_PAYS = t0.CODE_PAYS,
VILLE = t0.VILLE,
CODE_POSTAL = t0.CODE_POSTAL,
ZONE = t0.ZONE,
TEL_FAX = t0.TEL_FAX,
CODE_ADL = t0.CODE_ADL,
NOM_ADL = t0.NOM_ADL,
ADRESSE_ADL = t0.ADRESSE_ADL,
CODE_POSTAL_ADL = t0.CODE_POSTAL_ADL,
VILLE_ADL = t0.VILLE_ADL,
MT_TTC_BL = t0.MT_TTC_BL,
CODE_PAYS_ADL = t0.CODE_PAYS_ADL,
TEL_FAX_ADL = t0.TEL_FAX_ADL,
REM = t0.REM,
CODE_REGLEMENT = t0.CODE_REGLEMENT,
NO_FACTURE = t0.NO_FACTURE,
DATE_FACTURE = t0.DATE_FACTURE,
CODE_COMPTA = t0.CODE_COMPTA,
SITE = t0.SITE,
CODE_COMMERCIAL = t0.CODE_COMMERCIAL,
NBR_COLIS = t0.NBR_COLIS,
NOM_TRANSPORTEUR = t0.NOM_TRANSPORTEUR,
FACTURE_DIRECTE = t0.FACTURE_DIRECTE,
MOIS_FACTURE = t0.MOIS_FACTURE,
CLE_SITE_MOIS_FAC = t0.CLE_SITE_MOIS_FAC,
CLE_SITE_FD_CC = t0.CLE_SITE_FD_CC,
CLE_SITE_FD = t0.CLE_SITE_FD,
CLE_SITE_FD_CC_EDIT = t0.CLE_SITE_FD_CC_EDIT,
ARCHIVAGE = t0.ARCHIVAGE,
NO_TVA_CL = t0.NO_TVA_CL,
numero = t0.numero,
Bis = t0.bis,
voie = t0.voie,
P_identite = t0.P_identite,
p_numero = t0.p_numero,
p_du = t0.p_du,
p_par = t0.p_par,
nais_du = t0.nais_du,
nais_ville = t0.nais_ville,
nais_dep = t0.nais_dep,
nais_pays = t0.nais_pays,
num_siren = t0.num_siren,
id_bon_ademe = t0.id_bon_ademe,
poids_ademe_vhu = t0.poids_ademe_vhu,
CODE_BROYEUR = t0.CODE_BROYEUR,
IDlignes_bl = t.IDLIGNES_BL,
CODE_CLIENT_LI = t.CODE_CLIENT,
NO_BL_LI = t.NO_BL,
DATE_BL_LI = t.DATE_BL,
FAC_AVOIR_LI = t.FAC_AVOIR,
CODE_ARTICLE = t.CODE_ARTICLE,
NO_VEHICULE = t.NO_VEHICULE,
DESIGNATION = t.DESIGNATION,
QTE = t.QTE,
PU_HT = t.PU_HT,
REM_LI = t.REM,
CODE_TVA = t.CODE_TVA,
TAUX_TVA = t.TAUX_TVA,
NO_LIGNE = t.NO_LIGNE,
TYPE_ARTICLE = t.TYPE_ARTICLE,
LIB_LIBRE = t.LIB_LIBRE,
DESI_ARTICLE = t.DESI_ARTICLE,
CODE_GARANTIE = t.CODE_GARANTIE,
NO_FACTURE_LI = t.NO_FACTURE,
CODE_REGLEMENT_LI = t.CODE_REGLEMENT,
SITE_LI = t.SITE,
LIB_MODELE = t.LIB_MODELE,
PA_HT_TTC = t.PA_HT_TTC,
PU_NET = t.PU_NET,
PU_TTC = t.PU_TTC,
code_id_article = t.code_id_article,
site_stockage = t.site_stockage,
sans_trait_haut = t.sans_trait_haut,
nom_article_unique_demonter = t.nom_article_unique_demonter,
code_ademe_ligne = t.code_ademe_ligne,
poids_ademe = t.poids_ademe,
type_article_ademe = t.type_article_ademe,
consistance = t.consistance,
conditionnement = t.conditionnement,
nombre_carcasse = t.nombre_carcasse,
num_vehicule_entretien = t.num_vehicule_entretien,
num_immat_vehi_entretien = t.num_immat_vehi_entretien
};
return qer.AsQueryable();
and i have this code in button ,the problem is does not contain a definition for Getbl ?
DomainService1 testContext = new DomainService1();
private void button1_Click(object sender, System.Windows.RoutedEventArgs e)
{
InitializeComponent();
var res = testContext.Getbl();
}

Answer 1

Getbl returns an enumeration of an anonymous type. Anonymous types have only internal accessibility hence getbl is not included in service since that would in effect mean it would have return a list of type instances that should not be exposed publically.
Create a public class the has the list of Properties you want to return and include a new instance of this public class in your Select projection rather than using an anonymous type.

Answer 2

in addition to AnthonyWJones answer:
Use LoadOperation to get the data from the server:
LoadOperation<Customer> loadOp = this._customerContext.Load(this._customerContext.GetCustomersQuery());
CustomerGrid.ItemsSource = loadOp.Entities;
Note: Your method will have an appendix "Query" which RIA adds to Query methods.