我如何使用我的stubbaseclass作为测试新类的基础

Question

public class stubBaseTx : BaseTxFlowOperations
    {
        private MockRepository mocks;
        private ITransaction mockITransaction;
        public stubBaseTx()
        {
            mocks = new Rhino.Mocks.MockRepository();
            mockITransaction = mocks.DynamicMock<ITransaction>();
            mocks.ReplayAll();
        }
        protected override ITransaction FlowProperty_Transaction
        {
            get
            {
                return mockITransaction;
            }
        }
    }
   public class StubWithdrFlowISONet :WithdrawalFlowISONet
    {
       private MockRepository mocks;


        private bool FlowProperty_PINReAv = false;
        public StubWithdrFlowISONet()
        {
            mocks = new Rhino.Mocks.MockRepository();

            mocks.ReplayAll();
            stubBaseTx obj = new stubBaseTx();

            base.CreateCRMManager();

        }

        protected override bool FlowProperty_PINRetriesAvailable
        {
            get
            {

                return FlowProperty_PINReAv;
            }
        }


    }

这里WithdrawalFlowISONet来自WithdrawalFlowOperation类，而WithdrawalFlowOperation来自BaseTxFlowOperations类，现在我有FlowProperty_Transaction BaseTxFlowOperations中的属性，我必须传递给WithdrawalFlowISONet类，但它是readonly，只能在BaseTxFlowOperations中修改，现在我创建了stubBaseTx类，只是为了修改FlowProperty_Transaction 属性，那么如何将stubBaseTx类分配给WithdrawalFlowISONet类，以便它可以作为WithdrawalFlowISONet类的基础。 [C＃] 谢谢， NISHANT