获得的NullReferenceException在EF

我得到的例外在以下的第二行指定一个实体到另一个时：获得的NullReferenceException在EF

 var proceso = procesoService.GetEntityById(_codigoProceso); 
     var bitacora = new BitacoraEjecucionProceso 
          { 
           Mensaje = mensaje, 
           Fecha = DateTime.Now, 
           Resultado = resultado, 
           Proceso = proceso 
          };

异常的完整堆栈跟踪是：

System.NullReferenceException: Object reference not set to an instance of an object. 
    at System.Data.Objects.EntitySetQualifiedType.GetHashCode(EntitySetQualifiedType obj) 
    at System.Collections.Generic.Dictionary`2.FindEntry(TKey key) 
    at System.Collections.Generic.Dictionary`2.ContainsKey(TKey key) 
    at System.Data.Objects.ObjectStateManager.AddStateManagerTypeMetadata(EntitySet entitySet, ObjectTypeMapping mapping) 
    at System.Data.Objects.ObjectStateManager.GetOrAddStateManagerTypeMetadata(Type entityType, EntitySet entitySet) 
    at System.Data.Objects.ObjectStateManager.AddEntry(IEntityWrapper wrappedObject, EntityKey passedKey, EntitySet entitySet, String argumentName, Boolean isAdded) 
    at System.Data.Objects.ObjectContext.AddSingleObject(EntitySet entitySet, IEntityWrapper wrappedEntity, String argumentName) 
    at System.Data.Objects.DataClasses.RelatedEnd.AddEntityToObjectStateManager(IEntityWrapper wrappedEntity, Boolean doAttach) 
    at System.Data.Objects.DataClasses.RelatedEnd.AddGraphToObjectStateManager(IEntityWrapper wrappedEntity, Boolean relationshipAlreadyExists, Boolean addRelationshipAsUnchanged, Boolean doAttach) 
    at System.Data.Objects.DataClasses.RelatedEnd.Add(IEntityWrapper wrappedTarget, Boolean applyConstraints, Boolean addRelationshipAsUnchanged, Boolean relationshipAlreadyExists, Boolean allowModifyingOtherEndOfRelationship, Boolean forceForeignKeyChanges) 
    at System.Data.Objects.DataClasses.RelatedEnd.Add(IEntityWrapper wrappedEntity, Boolean applyConstraints) 
    at System.Data.Objects.DataClasses.EntityReference`1.set_ReferenceValue(IEntityWrapper value) 
    at System.Data.Objects.DataClasses.EntityReference`1.set_Value(TEntity value) 
    at Aseinfo.VH4.Data.BitacoraEjecucionProceso.set_Proceso(Proceso value) in C:\vh4\VH4\Data\AppDataContext.Designer.cs:line 16295

我已经检查过EF源代码，并且不知道为什么我的实体的哈希代码抛出一个NullReference .. 任何想法？

Thx！

来源

2011-08-24 sabanito

你是如何生成实体的？您是使用内置模板还是以某种方式定制它们？是否有可能覆盖默认的'GetHashCode（）'实现？ – CodingGorilla

不，我使用自动生成的上下文。看起来，当实体获得包装时，它在EntitySet.Name或EntitySet.Container.Name ....中返回null。 – sabanito

我发现了所发生的事情。我的DLL没有更新，因为我使用外部CSDL，SSDL和MSL文件。

来源

2011-08-26 22:51:26 sabanito

获得的NullReferenceException在EF

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