C# Microsoft.AspNet.OData 5.7.0（OData v.4）多级$expand AND#x27；行不通
编辑 我现在只剩下一个错误：C# Microsoft.AspNet.OData 5.7.0（OData v.4）多级$expand AND#x27；行不通,c#,asp.net-web-api2,odata,C#,Asp.net Web Api2,Odata,编辑 我现在只剩下一个错误： { "error":{ "code":"","message":"An error has occurred.","innererror":{ "message":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.","type":"Syste
{
"error":{
"code":"","message":"An error has occurred.","innererror":{
"message":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.","type":"System.InvalidOperationException","stacktrace":"","internalexception":{
"message":"Object reference not set to an instance of an object.","type":"System.NullReferenceException","stacktrace":" at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitConstantExpression(ConstantExpression expression)\r\n at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitBinaryExpression(BinaryExpression expression)\r\n at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitConditionalExpression(ConditionalExpression expression)\r\n at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitMemberExpression(MemberExpression expression)\r\n at NHibernate.Linq.Visitors.SelectJoinDetector.VisitMemberExpression(MemberExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitConditionalExpression(ConditionalExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Clauses.SelectClause.TransformExpressions(Func`2 transformation)\r\n at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)\r\n at NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root)\r\n at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory, Boolean filter)\r\n at NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryExpressionPlan..ctor(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters)\r\n at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow)\r\n at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute[TResult](Expression expression)\r\n at Remotion.Linq.QueryableBase`1.System.Collections.IEnumerable.GetEnumerator()\r\n at System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()"
}
}
}
}
odataconvectionmodelbuilderprivate static void SetUpODataModel(HttpConfiguration config)
{
ODataModelBuilder builder = new ODataConventionModelBuilder();
Type oDataModelBuilderType = builder.GetType();
MethodInfo entitySetMethodInfo = oDataModelBuilderType.GetMethod("EntitySet");
Type domainObjectInterfaceType = typeof(IMyDomainObject);
// Ignore properties when appropriate.
var institutionalAccountEntityType =
builder.EntitySet<InstitutionalAccount>("InstitutionalAccount").EntityType;
institutionalAccountEntityType.Ignore(ia => ia.SomethingPrivate);
// This doesn't help.
//var authorshipEntityType = builder.EntitySet<Authorship>("Authorship").EntityType;
//authorshipEntityType.ContainsRequired(x => x.Author);
//var profileEntityType = builder.EntitySet<Profile>("Profile").EntityType;
//profileEntityType.ContainsRequired(x => x.ProfileSubject);
foreach (
Type domainObjectType
in
domainObjectInterfaceType
.Assembly
.DefinedTypes
.Where(t => t.GetInterfaces().Any(i => i.Equals(domainObjectInterfaceType)))
.Where(t => t.IsClass)
)
{
// Skip the type if we've already added it, e.g., it's already
// been done by hand.
if (builder.EntitySets.Any(es => es.ClrType.Equals(domainObjectType)))
{
continue;
}
// This is equivalent to:
// builder.EntitySet<MyDomainObjectType>("MyDomainObjectType");
MethodInfo entitySetGenericMethodInfo = entitySetMethodInfo.MakeGenericMethod(domainObjectType);
Object entitySet = entitySetGenericMethodInfo.Invoke(builder, new[] { domainObjectType.Name });
}
config.EnableEnumPrefixFree(true);
config.MapODataServiceRoute(
routeName: "ODataRoute",
routePrefix: "OData",
model: builder.GetEdmModel());
}
private static void SetUpODataModel（HttpConfiguration配置）
{
ODataModelBuilder=新ODataConventionModelBuilder（）；
类型oDataModelBuilderType=builder.GetType（）；
MethodInfo entitySetMethodInfo=oDataModelBuilderType.GetMethod（“EntitySet”）；
类型domainObjectInterfaceType=typeof（IMyDomainObject）；
//适当时忽略属性。
var机构会计类型=
builder.EntitySet（“机构账户”）.EntityType；
InstitutionalAccountityType.Ignore（ia=>ia.SomethingPrivate）；
//这没用。
//var authorshipEntityType=builder.EntitySet，甚至没有在搜索词中包含NHibernate，但这不起作用
编辑：对于@FanOuyang的评论，我仍然收到错误。我的代码现在看起来像
var w=新作者[]{/*没有循环引用的长而大的混乱*/}；
返回w.AsQueryable（）
编辑：我使用的测试代码没有达到我认为的效果。我编写了一些新代码，将结果集复制到新对象（包括循环引用）中，并且似乎正常工作，因此问题确实与NH有关。根据I$expand的内容，我得到的错误有：
{
"error":{
"code":"","message":"An error has occurred.","innererror":{
"message":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.","type":"System.InvalidOperationException","stacktrace":"","internalexception":{
"message":"Argument types do not match","type":"System.ArgumentException","stacktrace":" at System.Linq.Expressions.Expression.Condition(Expression test, Expression ifTrue, Expression ifFalse)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitConditionalExpression(ConditionalExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at NHibernate.Linq.NestedSelects.NestedSelectRewriter.ReWrite(QueryModel queryModel, ISessionFactory sessionFactory)\r\n at NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root)\r\n at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory, Boolean filter)\r\n at NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryExpressionPlan..ctor(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters)\r\n at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow)\r\n at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute[TResult](Expression expression)\r\n at Remotion.Linq.QueryableBase`1.System.Collections.IEnumerable.GetEnumerator()\r\n at System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()"
}
}
}
}
{
“错误”：{
“代码”：”“消息”：“发生错误”。、“内部错误”：{
“消息”：“ObjectContent`1”类型未能序列化内容类型“application/json；odata.metadata=minimal.”的响应正文，“类型”：“System.InvalidOperationException”，“stacktrace”：“internalexception”：{
“消息”：“参数类型不匹配”，“类型”：“System.ArgumentException”，“stacktrace”：“at System.Linq.Expressions.Expression.Condition（表达式测试，表达式ifTrue，表达式ifFalse）\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitConditionExpression（条件表达式表达式）\r\n位于NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression（表达式表达式）\r\n位于Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment（MemberAssignment MemberAssignment）\r\n位于Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T]（只读集合'1列表，函数'2 visitMethod）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression（MemberInitExpression表达式）\r\n在NHibernate.Linq.NestedSelects.SelectClaureWriter.visiteExpression（表达式表达式）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment（MemberAssignment MemberAssignment）处\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T]（ReadOnlyCollection`1列表，Func`2 visitMethod）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression（MemberInitExpression表达式）\r\n在NHibernate.Linq.nestedSelectClaureWriter.VisitePression（表达式表达式表达式）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment（MemberAssignment MemberAssignment）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T]（ReadOnlyCollection`1列表，Func`2 visitMethod）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression（MemberInitExpression）\r\n位于NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression（表达式表达式）\r\n位于Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment（MemberAssignment MemberAssignment）\r\n位于Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T]（只读集合'1列表，函数'2 visitMethod）\r\n在Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression（MemberInitExpression表达式）\r\n在NHibernate.Linq.NestedSelects.SelectClaureWriter.visiteExpression（表达式表达式）\r\n在NHibernate.Linq.nestedSelecteWriter.nestedSelecteWriter（QueryModel QueryModel，ISessionFactory sessionFactory sessionFactory）\r\n在NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery（QueryModel QueryModel，VisitorParameters参数，布尔根）\r\n在NHibernate.Linq.NhLinqExpression.Translate（ISessionFactoryImplementor sessionFactory，布尔过滤器）\r\n在NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators（IQueryExpression queryExpression，String collectionRole，布尔浅层，IDictionary`2筛选器，ISessionFactoryImplementor工厂）\r\n位于NHibernate.Engine.Query.QueryExpressionPlan..ctor（IQueryExpression queryExpression，布尔浅层，IDictionary`2 enabledFilters，ISessionFactoryImplementor工厂）\r\n位于NHibernate.Engine.Query.QueryLancache.GetHQLQueryPlan（IQueryExpression queryExpression，布尔浅层，IDictionary`2 EnabledFilter）\r\n位于NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan（IQueryExpression queryExpression，布尔浅层）\r\n位于NHibernate.Impl.AbstractSessionImpl.CreateQuery（IQueryExpression queryExpression queryExpression）\r\n位于NHibernate.Linq.DefaultQueryProvider.Execute（表达式表达式）\r\n位于NHibernate.Linq.DefaultQueryProvider.Execute[TResult]（表达式表达式）\r\n位于Remotion.Linq.QueryableBase`1.System.Collections.IEnumerable.GetEnumerator（）\r\n位于System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed（IEnumerable enumerable、IEdmTypeReference feedType、ODataWriter、ODataSerializerContext writeContext）\r\n位于System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream（类型、对象值、流writeStream、HttpContent内容、HttpContentHeaders contentHeaders）\r\n位于System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync（类型类型、对象值、流writeStream、HttpContent内容、TransportContext TransportContext、CancellationToken CancellationToken）\r\n---从引发异常的上一个位置开始的堆栈结束跟踪---\r\n位于System.Runtime.Com
private static void SetUpODataModel(HttpConfiguration config)
{
ODataModelBuilder builder = new ODataConventionModelBuilder();
Type oDataModelBuilderType = builder.GetType();
MethodInfo entitySetMethodInfo = oDataModelBuilderType.GetMethod("EntitySet");
Type domainObjectInterfaceType = typeof(IMyDomainObject);
// Ignore properties when appropriate.
var institutionalAccountEntityType =
builder.EntitySet<InstitutionalAccount>("InstitutionalAccount").EntityType;
institutionalAccountEntityType.Ignore(ia => ia.SomethingPrivate);
// This doesn't help.
//var authorshipEntityType = builder.EntitySet<Authorship>("Authorship").EntityType;
//authorshipEntityType.ContainsRequired(x => x.Author);
//var profileEntityType = builder.EntitySet<Profile>("Profile").EntityType;
//profileEntityType.ContainsRequired(x => x.ProfileSubject);
foreach (
Type domainObjectType
in
domainObjectInterfaceType
.Assembly
.DefinedTypes
.Where(t => t.GetInterfaces().Any(i => i.Equals(domainObjectInterfaceType)))
.Where(t => t.IsClass)
)
{
// Skip the type if we've already added it, e.g., it's already
// been done by hand.
if (builder.EntitySets.Any(es => es.ClrType.Equals(domainObjectType)))
{
continue;
}
// This is equivalent to:
// builder.EntitySet<MyDomainObjectType>("MyDomainObjectType");
MethodInfo entitySetGenericMethodInfo = entitySetMethodInfo.MakeGenericMethod(domainObjectType);
Object entitySet = entitySetGenericMethodInfo.Invoke(builder, new[] { domainObjectType.Name });
}
config.EnableEnumPrefixFree(true);
config.MapODataServiceRoute(
routeName: "ODataRoute",
routePrefix: "OData",
model: builder.GetEdmModel());
}
{
"error":{
"code":"","message":"An error has occurred.","innererror":{
"message":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.","type":"System.InvalidOperationException","stacktrace":"","internalexception":{
"message":"Argument types do not match","type":"System.ArgumentException","stacktrace":" at System.Linq.Expressions.Expression.Condition(Expression test, Expression ifTrue, Expression ifFalse)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitConditionalExpression(ConditionalExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at NHibernate.Linq.NestedSelects.SelectClauseRewriter.VisitExpression(Expression expression)\r\n at NHibernate.Linq.NestedSelects.NestedSelectRewriter.ReWrite(QueryModel queryModel, ISessionFactory sessionFactory)\r\n at NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root)\r\n at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory, Boolean filter)\r\n at NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryExpressionPlan..ctor(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters)\r\n at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow)\r\n at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute[TResult](Expression expression)\r\n at Remotion.Linq.QueryableBase`1.System.Collections.IEnumerable.GetEnumerator()\r\n at System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()"
}
}
}
}
{
"error":{
"code":"","message":"An error has occurred.","innererror":{
"message":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; odata.metadata=minimal'.","type":"System.InvalidOperationException","stacktrace":"","internalexception":{
"message":"Object reference not set to an instance of an object.","type":"System.NullReferenceException","stacktrace":" at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitConstantExpression(ConstantExpression expression)\r\n at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitBinaryExpression(BinaryExpression expression)\r\n at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitConditionalExpression(ConditionalExpression expression)\r\n at NHibernate.Linq.Visitors.ExpressionKeyVisitor.VisitMemberExpression(MemberExpression expression)\r\n at NHibernate.Linq.Visitors.SelectJoinDetector.VisitMemberExpression(MemberExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitConditionalExpression(ConditionalExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberAssignment(MemberAssignment memberAssigment)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitList[T](ReadOnlyCollection`1 list, Func`2 visitMethod)\r\n at Remotion.Linq.Parsing.ExpressionTreeVisitor.VisitMemberInitExpression(MemberInitExpression expression)\r\n at Remotion.Linq.Clauses.SelectClause.TransformExpressions(Func`2 transformation)\r\n at Remotion.Linq.QueryModelVisitorBase.VisitQueryModel(QueryModel queryModel)\r\n at NHibernate.Linq.Visitors.QueryModelVisitor.GenerateHqlQuery(QueryModel queryModel, VisitorParameters parameters, Boolean root)\r\n at NHibernate.Linq.NhLinqExpression.Translate(ISessionFactoryImplementor sessionFactory, Boolean filter)\r\n at NHibernate.Hql.Ast.ANTLR.ASTQueryTranslatorFactory.CreateQueryTranslators(IQueryExpression queryExpression, String collectionRole, Boolean shallow, IDictionary`2 filters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryExpressionPlan..ctor(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters, ISessionFactoryImplementor factory)\r\n at NHibernate.Engine.Query.QueryPlanCache.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow, IDictionary`2 enabledFilters)\r\n at NHibernate.Impl.AbstractSessionImpl.GetHQLQueryPlan(IQueryExpression queryExpression, Boolean shallow)\r\n at NHibernate.Impl.AbstractSessionImpl.CreateQuery(IQueryExpression queryExpression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute(Expression expression)\r\n at NHibernate.Linq.DefaultQueryProvider.Execute[TResult](Expression expression)\r\n at Remotion.Linq.QueryableBase`1.System.Collections.IEnumerable.GetEnumerator()\r\n at System.Web.OData.Formatter.Serialization.ODataFeedSerializer.WriteFeed(IEnumerable enumerable, IEdmTypeReference feedType, ODataWriter writer, ODataSerializerContext writeContext)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStream(Type type, Object value, Stream writeStream, HttpContent content, HttpContentHeaders contentHeaders)\r\n at System.Web.OData.Formatter.ODataMediaTypeFormatter.WriteToStreamAsync(Type type, Object value, Stream writeStream, HttpContent content, TransportContext transportContext, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.WebHost.HttpControllerHandler.<WriteBufferedResponseContentAsync>d__1b.MoveNext()"
}
}
}
}