J'ai des tables order-items. donc je veux afficher sur une grille toutes les informations de commande y compris un col comme total_itemsLinq - somme de la valeur du champ enfant lorsque la requête d'enregistrement enfant est ganaretée par diff func
Il y a un chemin de travail prémétitif. comme ceci:
TotalQuantity =
(from i in _db.ProposaItems
where i.ProposaID == p.ProposaID select i)
.Sum(q => q.Quantity)
Mais ce n'est pas comme je le veux. Je veux utiliser 2 funcs:
Fonction 1:
//BizNet.SqlRepository.Data.ProposalItem
public IQueryable<ProposaItem> GetItems(Guid ProposaID)
{
return from i in _db.ProposaItems
where i.ProposaID == ProposaID
select i;
}
Fonction 2.
public void GetProposas()
{
var x = from p in _db.Proposas
let t= GetItems(p.ProposaID)
.Sum(q => q.Quantity)
select new
{
ID = p.ProposaID,
TotalQuantity = t
};
}
Pour moi, son look très simple. Mais dans la ligne
x.Count();
Le résultat est une exception.
"Member access 'Int16 Quantity' of 'BizNet.SqlRepository.Data.ProposaItem' not legal on type 'System.Linq.IQueryable`1[BizNet.SqlRepository.Data.ProposaItem]."
" at System.Data.Linq.SqlClient.SqlMember.set_Expression(SqlExpression value)\r\n at System.Data.Linq.SqlClient.SqlFactory.Member(SqlExpression expr, MemberInfo member)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.AccessMember(SqlMember m, SqlExpression expo)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitMember(SqlMember m)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitExpression(SqlExpression expr)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitUnaryOperator(SqlUnary uo)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitExpression(SqlExpression expr)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitSimpleExpression(SqlSimpleExpression simple)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitExpression(SqlExpression expr)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitUnaryOperator(SqlUnary uo)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitExpression(SqlExpression expr)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitSelect(SqlSelect select)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlVisitor.VisitSequence(SqlSelect sel)\r\n at System.Data.Linq.SqlClient.SqlVisitor.VisitScalarSubSelect(SqlSubSelect ss)\r\n at System.Data.Linq.SqlClient.SqlVisitor.VisitSubSelect(SqlSubSelect ss)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitSubSelect(SqlSubSelect ss)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitExpression(SqlExpression expr)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitNew(SqlNew sox)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitExpression(SqlExpression expr)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitSelect(SqlSelect select)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitAlias(SqlAlias a)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlVisitor.VisitSource(SqlSource source)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitSelect(SqlSelect select)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitAlias(SqlAlias a)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlVisitor.VisitSource(SqlSource source)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitSelect(SqlSelect select)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Visitor.VisitIncludeScope(SqlIncludeScope scope)\r\n at System.Data.Linq.SqlClient.SqlVisitor.Visit(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlBinder.Bind(SqlNode node)\r\n at System.Data.Linq.SqlClient.SqlProvider.BuildQuery(ResultShape resultShape, Type resultType, SqlNode node, ReadOnlyCollection`1 parentParameters, SqlNodeAnnotations annotations)\r\n at System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query, SqlNodeAnnotations annotations)\r\n at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)\r\n at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)\r\n at System.Linq.Queryable.Count[TSource](IQueryable`1 source)"
Il ya une explication à cela?
merci.
Vous devrez nous indiquer quelle exception vous obtenez exactement et sur quelle ligne dans le code S'il vous plaît. – Noldorin