小编ole*_*eau的帖子

假设我有一个通用接口 IService<T>和一个实现它的类Service : IService<Bar> 我创建了该接口的代理:

var proxy = new DynamicProxy<IService<Bar>>(new Service()).GetTransparentProxy() as IService<Bar>;

DynamicProxy是RealProxy的一个简单实现:

    public class DynamicProxy<I> : RealProxy
    {
        private I _decorated;

        public DynamicProxy(I decorated) : base(typeof(I))
        {
            this._decorated = decorated;
        }

        public override IMessage Invoke(IMessage msg)
        {
            IMethodCallMessage methodCall = (IMethodCallMessage)msg;
            MethodInfo methodInfo = methodCall.MethodBase as MethodInfo;

            return new ReturnMessage(
                methodInfo.Invoke(this._decorated, methodCall.InArgs),
                null,
                0,
                methodCall.LogicalCallContext,
                methodCall);
        }
    }

直接使用我的代理时它工作正常:

IEnumerable<Bar> bars = new List<Bar>() { new Bar { id = 2 }, new Bar { id …

我有Pocos和可以为空的外键的问题.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)我在两个表之间设置了一个0,1 ..*关联.一个订单可以与0或1个产品相关.一个产品有*与他有关的订单.

如何崩溃:

• 使用CreateObject()创建新产品.
• 将新产品添加到实体集.
• 使用CreateObject()创建新订单.
• 将新订单添加到实体集.

当我向产品的订单列表添加订单时,它会崩溃尝试修复关联(在新订单上设置产品导航属性)

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 
( …