AsBooleanExpression中的NHibernate InvalidCastException，HQLTreeNode.cs中的HqlTreeNodeExtensions类
：我有个问题...我选择使用NHibernate 3.3.3源代码，而不是预编译的DLL，因为我已经厌倦了NHibernate问题，并且无法调试它们(即黑盒)。我用fluent NHibernate也做了同样的事情。
我用预编译的NHibernate动态链接库测试了我为fluent NHibernate编译的源代码，它可以工作。所以我决定更进一步，用NHibernate做同样的事情。这就是它糟糕的地方:我的应用程序启动，搜索引擎vorks，等等……但是每次我尝试保存一些东西时，我在类HqlTreeNodeExtensions (在文件HQLTreeNode.cs中)的"AsBooleanExpression“方法中收到一个"NHibernate.Hql.Ast.HQLBitWiseAnd”类型的值，而不能将其转换为NHibernate.Hql.Ast.HqlBooleanExpression时，就会得到一个InvalidCastException。
为什么它可以在编译后的DLL上运行，而不能在源代码中运行？我对NHibernate的内部原理一无所知，只对c#略知一二，因为我是一名VB开发人员。
这就是它发生的地方：
public static class HqlTreeNodeExtensions
{
public static HqlExpression AsExpression(this HqlTreeNode node)
{
// TODO - nice error handling if cast fails
return (HqlExpression)node;
}
public static HqlBooleanExpression AsBooleanExpression(this HqlTreeNode node)
{
if (node is HqlDot)
{
return new HqlBooleanDot(node.Factory, (HqlDot) node);
}
// TODO - nice error handling if cast fails
return (HqlBooleanExpression)node; <-------- RIGHT HERE - the cast fails
}
}(无法为堆栈调用发布图像；将尝试将其转换为可读性文本)
有人能帮帮他吗？
非常感谢
尼科
附注:这是完整的调用堆栈: Ok；这里我们开始完整的调用堆栈:摘录自我自己的代码: All开始于行"Dim ctrlResultatsRecherche As New ResultatsRechercheClientV2...“
Private Sub RechercheClient_KeyDown(ByVal sender As Object, ByVal e As KeyEventArgs) Handles txtCodePostal.KeyDown, txtClient.KeyDown, txtRue.KeyDown, txtVille.KeyDown
If e.KeyCode = Keys.Enter Then
Dim bolMaibecExpress As Boolean = False
'Récupérer le contrôle parent.
If Not Parent Is Nothing AndAlso TypeOf Parent.Parent Is SaisieDemandeEchantillon Then
bolMaibecExpress = TryCast(Parent.Parent, SaisieDemandeEchantillon).chkMaibecExpress.Checked
End If
panDetails.Controls.DisposeAndRemoveAll()
Dim ctrlResultatsRecherche As New ResultatsRechercheClientV2(m_Session, txtClient.Text, txtCodePostal.Text, txtVille.Text, txtRue.Text, bolMaibecExpress)
AddHandler ctrlResultatsRecherche.ClientSelectionneV2, AddressOf RésultatsRecherche_ClientSélectionné
panDetails.Controls.Add(ctrlResultatsRecherche)
panDetails.Visible = True
End If
End Sub然后摘自我自己的代码:在"Dim resultats = m_Session.Query(Of Client).Where(predicat.Expand).ToList“行停止。
Public Sub New(ByVal session As ISession, ByVal strClient As String, ByVal strCodePostal As String, ByVal strVille As String, ByVal strRue As String, Optional ByVal MaibecExpress As Boolean = False)
' This call is required by the Windows Form Designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
dgvResultatsRecherche.AutoGenerateColumns = False
m_Session = session
Dim predicat = PredicateBuilder.False(Of Client)()
predicat = predicat.Or(Function(x As Client) (x.Prenom.Contains(strClient) OrElse x.Nom.Contains(strClient) OrElse x.Telephone.Contains(strClient) OrElse x.Courriel.Contains(strClient) OrElse strClient = "") _
And (x.Adresse.CodePostal.Contains(strCodePostal) Or strCodePostal = "") _
And (x.Adresse.Ville.Contains(strVille) Or strVille = "") _
And (x.Adresse.Ligne1.Contains(strRue) Or strRue = "") _
And (x.MaibecExpress = MaibecExpress Or MaibecExpress = False))
Dim resultats = m_Session.Query(Of Client).Where(predicat.Expand).ToList
dgvResultatsRecherche.DataSource = resultats
lblNbResultatsTrouvés.Text = String.Format("{0} résultats trouvés", resultats.Count)
SetDataBindings()
End Sub然后调用remotion.link.dll -> Remotion.Linq.QueryableBase.GetEnumerator() (对不起，没有代码)
然后从NHibernate.Linq.DefaultQueryProvider执行sub，在"NhLinqExpression nhLinqExpression = PrepareQuery(expression，out query，out nhQuery);“行
public TResult Execute<TResult>(Expression expression)
{
return (TResult) Execute(expression);
}然后从NHibernate.Linq.DefaultQueryProvider的"return“行执行sub
public virtual object Execute(Expression expression)
{
IQuery query;
NhLinqExpression nhQuery;
NhLinqExpression nhLinqExpression = PrepareQuery(expression, out query, out nhQuery);
return ExecuteQuery(nhLinqExpression, query, nhQuery);
}然后从NHibernate.Linq.DefaultQueryProvider查询，在“PrepareQuery = Session.CreateQuery(nhLinqExpression);”行
protected NhLinqExpression PrepareQuery(Expression expression, out IQuery query, out NhLinqExpression nhQuery)
{
var nhLinqExpression = new NhLinqExpression(expression, Session.Factory);
query = Session.CreateQuery(nhLinqExpression);
nhQuery = query.As<ExpressionQueryImpl>().QueryExpression.As<NhLinqExpression>();
SetParameters(query, nhLinqExpression.ParameterValuesByName);
SetResultTransformerAndAdditionalCriteria(query, nhQuery, nhLinqExpression.ParameterValuesByName);
return nhLinqExpression;
}然后是来自NHibernate.Impl.AbstractSessionImpl的CreateQuery sub，在"var queryPlan = GetHQLQueryPlan(queryExpression，false);“行
public virtual IQuery CreateQuery(IQueryExpression queryExpression)
{
using (new SessionIdLoggingContext(SessionId))
{
CheckAndUpdateSessionStatus();
var queryPlan = GetHQLQueryPlan(queryExpression, false);
var query = new ExpressionQueryImpl(queryPlan.QueryExpression,
this,
queryPlan.ParameterMetadata
);
query.SetComment("[expression]");
return query;
}
}然后是NHibernate.Impl.AbstractSessionImpl的GetHQLQueryPlan sub (在返回线卡住)
protected internal virtual IQueryExpressionPlan GetHQLQueryPlan(IQueryExpression queryExpression, bool shallow)
{
using (new SessionIdLoggingContext(SessionId))
{
return factory.QueryPlanCache.GetHQLQueryPlan(queryExpression, shallow, EnabledFilters);
}
}然后是来自NHibernate.Engine.Query.QueryPlan的GetHQLQueryPlan sub (jams at line Plan =新的HQLExpressionQueryPlan (...))
public IQueryExpressionPlan GetHQLQueryPlan(IQueryExpression queryExpression, bool shallow, IDictionary<string, IFilter> enabledFilters)
{
string expressionStr = queryExpression.Key;
var key = new HQLQueryPlanKey(queryExpression, shallow, enabledFilters);
var plan = (IQueryExpressionPlan)planCache[key];
if (plan == null)
{
if (log.IsDebugEnabled)
{
log.Debug("unable to locate HQL query plan in cache; generating (" + expressionStr + ")");
}
plan = new HQLExpressionQueryPlan(expressionStr, queryExpression, shallow, enabledFilters, factory);
planCache.Put(key, plan);
}
else
{
if (log.IsDebugEnabled)
{
log.Debug("located HQL query plan in cache (" + expressionStr + ")");
}
var planExpression = plan.QueryExpression as NhLinqExpression;
var expression = queryExpression as NhLinqExpression;
if (planExpression != null && expression != null)
{
//NH-3413
//Here we have to use original expression.
//In most cases NH do not translate expression in second time, but
// for cases when we have list parameters in query, like @p1.Contains(...),
// it does, and then it uses parameters from first try.
//TODO: cache only required parts of QueryExpression
planExpression._expression = expression._expression;
planExpression._constantToParameterMap = expression._constantToParameterMap;
}
}
return plan;
}然后在HQLExpressionQueryPlan中(跳过属性)，在返回行：
private static IQueryTranslator[] CreateTranslators(string expressionStr, IQueryExpression queryExpression, string collectionRole, bool shallow, IDictionary<string, IFilter> enabledFilters, ISessionFactoryImplementor factory)
{
IQueryTranslatorFactory2 qtFactory = new ASTQueryTranslatorFactory();
return qtFactory.CreateQueryTranslators(expressionStr, queryExpression, collectionRole, shallow, enabledFilters, factory);
}然后在ASTQueryTranslatorFactory.cs中，在返回行：
public IQueryTranslator[] CreateQueryTranslators(string queryIdentifier, IQueryExpression queryExpression, string collectionRole, bool shallow, IDictionary<string, IFilter> filters, ISessionFactoryImplementor factory)
{
return CreateQueryTranslators(queryExpression.Translate(factory), queryIdentifier, collectionRole, shallow,
filters, factory);
}在QueryModelVisitor.cs中，在GenerateHqlQuery (仅摘录)中的Visitor.Visit()行//... //识别和命名查询源(Visitor.Visit queryModel)；
var visitor = new QueryModelVisitor(parameters, root, queryModel) { RewrittenOperatorResult = result };
visitor.Visit();
return visitor._hqlTree.GetTranslation();然后对Remotion进行了几次调用，但我没有代码...然后，在表达式中，在VisitWhereClause中，在var QueryModelVisitor.cs =...
public override void VisitWhereClause(WhereClause whereClause, QueryModel queryModel, int index)
{
// Visit the predicate to build the query
var expression = HqlGeneratorExpressionTreeVisitor.Visit(whereClause.Predicate, VisitorParameters).AsBooleanExpression();
if (whereClause is NhHavingClause)
{
_hqlTree.AddHavingClause(expression);
}
else
{
_hqlTree.AddWhereClause(expression);
}
}然后在HQLGeneratorExpressionTreeVisitor.cs中，在访问函数中，返回行：
public static HqlTreeNode Visit(Expression expression, VisitorParameters parameters)
{
return new HqlGeneratorExpressionTreeVisitor(parameters).VisitExpression(expression);
}然后，在同一文件中，行返回表达式((BinaryExpression)VisitBinaryExpression)-(仅摘录)：
//...
case ExpressionType.GreaterThan:
case ExpressionType.LessThan:
case ExpressionType.LessThanOrEqual:
case ExpressionType.Coalesce:
case ExpressionType.ArrayIndex:
return VisitBinaryExpression((BinaryExpression) expression);
case ExpressionType.Conditional:
return VisitConditionalExpression((ConditionalExpression) expression);
case ExpressionType.Constant:
return VisitConstantExpression((ConstantExpression) expression);
//...Same file，function VisitBinaryExpression，linereturn _hqlTreeBuilder.BooleanOr(lhs.AsBooleanExpression()，rhs.AsBooleanExpression()) -仅摘录
//...
case ExpressionType.AndAlso:
return _hqlTreeBuilder.BooleanAnd(lhs.AsBooleanExpression(), rhs.AsBooleanExpression());
case ExpressionType.Or:
return _hqlTreeBuilder.BitwiseOr(lhs, rhs);
case ExpressionType.OrElse:
return _hqlTreeBuilder.BooleanOr(lhs.AsBooleanExpression(), rhs.AsBooleanExpression());
case ExpressionType.Add:
if (expression.Left.Type == typeof (string) && expression.Right.Type == typeof (string))
{
return _hqlTreeBuilder.MethodCall("concat", lhs, rhs);
}
return _hqlTreeBuilder.Add(lhs, rhs);
//...最后，在HQLTreeNode.cs中，行返回(HqlBooleanExpression)节点，靠近奇怪的todo注释：
public static class HqlTreeNodeExtensions
{
public static HqlExpression AsExpression(this HqlTreeNode node)
{
// TODO - nice error handling if cast fails
return (HqlExpression)node;
}
public static HqlBooleanExpression AsBooleanExpression(this HqlTreeNode node)
{
if (node is HqlDot)
{
return new HqlBooleanDot(node.Factory, (HqlDot) node);
}
// TODO - nice error handling if cast fails
return (HqlBooleanExpression)node;
}
} 回答 1
Stack Overflow用户
发布于 2013-05-02 02:35:54
您可能会中断抛出的异常，但如果您继续(F5)，该异常将在NHibernate源代码的更高级别上处理。尽管源代码中的注释让我产生了怀疑。尝试这样做:在Visual Studio中，转到Debug > Exceptions并取消选中抛出列中Common Language Runtime Exception的复选框。
https://stackoverflow.com/questions/16324000
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