Pocos和可空的外键有问题。 我有2个表(订单和产品)每个表都有一个复合主键(orderid,orderid2)和(productid,productid2) 我已经在两个表之间设置了0,1 .. *关联。 一个订单可能与0或1个产品有关。 一个产品有*与他有关的命令。使用空的复合外键进行关联修复时出现异常
如何崩溃:
- 创建使用的CreateObject一个新产品()。
- 将新产品添加到当前的实体集。
- 创建一个新订单usung CreateObject()。
- 将新订单添加到实体集。
当我添加订单到产品的订单列表中,它崩溃试图修正内容协会(设置新秩序的产品导航性能)
CREATE TABLE [dbo].[Products](
[productid] [int] IDENTITY(1,1) NOT NULL,
[productid2] [int] NOT NULL,
[productname] [nchar](10) NULL,
CONSTRAINT [PK_Products] PRIMARY KEY CLUSTERED
(
[productid] ASC,
[productid2] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
CREATE TABLE [dbo].[Orders](
[orderid] [int] NOT NULL,
[orderid2] [int] NOT NULL,
[ordername] [nchar](10) NULL,
[productid] [int] NULL,
[productid2] [int] NULL,
CONSTRAINT [PK_orders] PRIMARY KEY CLUSTERED
(
[orderid] ASC,
[orderid2] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
代码崩溃:
var product = context.CreateObject<Products>();
context.Products.AddObject(product);
var order = context.CreateObject<Orders>();
context.Orders.AddObject(order);
product.Orders.Add(order);
if (order.Product != product) Console.WriteLine("error");
例外:
System.Data.EntityException was unhandled
Message=Unable to set field/property Product on entity type System.Data.Entity.DynamicProxies.Orders_A0290D8629F0336D278E5AEF2C0F2A91FF56726ED5E3A9FA668AC902696A8651. See InnerException for details.
Source=System.Data.Entity
StackTrace:
at System.Data.Objects.Internal.PocoPropertyAccessorStrategy.SetNavigationPropertyValue(RelatedEnd relatedEnd, Object value)
at System.Data.Objects.Internal.EntityWrapper`1.SetNavigationPropertyValue(RelatedEnd relatedEnd, Object value)
at System.Data.Objects.DataClasses.EntityReference`1.AddToObjectCache(IEntityWrapper wrappedEntity)
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.EntityCollection`1.Add(TEntity entity)
at Proxies.CSharp.Program.Main(String[] args) in Program.cs:line 20
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException: System.NullReferenceException
Message=Object reference not set to an instance of an object.
Source=Proxies.CSharp
StackTrace:
at Proxies.CSharp.Orders.FixupProduct(Products previousValue, Boolean skipKeys) in Orders.cs:line 134
at Proxies.CSharp.Orders.set_Product(Products value) in Orders.cs:line 106
at System.Data.Entity.DynamicProxies.Orders_A0290D8629F0336D278E5AEF2C0F2A91FF56726ED5E3A9FA668AC902696A8651.SetBasePropertyValue(String , Object)
at lambda_method(Closure , Object , String , Object)
at System.Data.Objects.Internal.EntityProxyFactory.TrySetBasePropertyValue(Type proxyType, String propertyName, Object entity, Object value)
at System.Data.Objects.Internal.EntityProxyFactory.<>c__DisplayClass8.<CreateBaseSetter>b__7(Object entity, Object value)
at System.Data.Objects.Internal.PocoPropertyAccessorStrategy.SetNavigationPropertyValue(RelatedEnd relatedEnd, Object value)
注:它的工作原理与entytobjects,其工作原理与自跟踪实体,和它的工作原理,如果关键是不是复合或不能为空。
我做错了什么或它是一个真正的错误?
我想说你最好在发电机的现场报告,然后检查并看到你已经做到了。奖励! – mcyalcin 2011-02-25 12:53:10