: 我有一个问题... 我选择使用 NHibernate 3.3.3 源而不是预编译的 DLL 因为我厌倦了 NHibernate 问题并且无法调试它们（即黑匣子）。我对流利的 NHibernate 做了同样的事情。
我使用预编译的 NHibernate DLL 测试了我为流畅的 NHibernate 编译的源代码，它工作正常。所以我决定更进一步，对 NHibernate 做同样的事情。这就是糟糕的地方：我的应用程序启动，搜索引擎 vorks 等...但是每次我尝试保存某些内容时，我都会在 HqlTreeNodeExtensions 类（在文件 HQLTreeNode.cs 中）的“AsBooleanExpression”方法中收到 InvalidCastException “NHibernate.Hql.Ast.HQLBitWiseAnd”类型的值，无法将其转换为 NHibernate.Hql.Ast.HqlBooleanExpression。
为什么它适用于已编译的 DLL 而在源代码中不起作用？我对 NHibernate 的内部了解为零，对 c# 了解一点，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 readavle 文本）
有人可以帮助他吗？
非常感谢
尼科
PS这是完整的调用堆栈：好的；在这里我们获取完整的调用堆栈：摘自我自己的代码：一切都从“Dim ctrlResultatsRecherche As New ResultatsRechercheClientV2 ...”行开始
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：停在“Dim resultats = m_Session.Query(Of Client).Where(predicat.Expand).ToList”行
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）
然后在“NhLinqExpression nhLinqExpression = PrepareQuery(expression, out query, out nhQuery);”处从 NHibernate.Linq.DefaultQueryProvider 执行 sub 线
public TResult Execute<TResult>(Expression expression)
{
return (TResult) Execute(expression);
}
然后在“return”行从 NHibernate.Linq.DefaultQueryProvider 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);
}
然后在“query = Session.CreateQuery(nhLinqExpression);”处来自 NHibernate.Linq.DefaultQueryProvider 的 PrepareQuery 线
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;
}
然后从 NHibernate.Impl.AbstractSessionImpl CreateQuery sub，在“var queryPlan = GetHQLQueryPlan(queryExpression, false);” 线
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 中的 GetHQLQueryPlan 子程序（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);
}
}
然后从 NHibernate.Engine.Query.QueryPlan 中获取 GetHQLQueryPlan 子（线路计划中的堵塞 = new 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 中的返回行：
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 QuerySourceIdentifier.Visit(parameters.QuerySourceNamer, queryModel);
var visitor = new QueryModelVisitor(parameters, root, queryModel) { RewrittenOperatorResult = result };
visitor.Visit();
return visitor._hqlTree.GetTranslation();
然后对我没有代码的 Remotion DLL 进行了几次调用......然后，在 QueryModelVisitor.cs 中，在 VisitWhereClause 中，在行 var expression =...
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，行返回：
public static HqlTreeNode Visit(Expression expression, VisitorParameters parameters)
{
return new HqlGeneratorExpressionTreeVisitor(parameters).VisitExpression(expression);
}
然后，在同一个文件中，行 return VisitBinaryExpression((BinaryExpression) expression) - （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);
//...
相同的文件，函数 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 return (HqlBooleanExpression)node ，靠近奇怪的待办事项注释：
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;
}
}