todictionary方法中的公共字典

时间:2016-02-11 02:03:50

标签: vb.net linq-to-sql todictionary

我正在尝试访问在其他过程中使用todictionary方法创建的字典。

这是我想要的,但我收到编译错误。

Public dctOPT As New Dictionary(Of Integer, Object)

 Sub Get_RTD_OPT()

        Dim lstOPT = From C In DATA.CHAINs, O In DATA.OPTIONs, U In DATA.UDLies
                     Where C.CONTRACT = O.CONTRACT And O.UDLY_SYM = U.UDLY_SYM
                     Select C.ID, C.P_C, C.STRIKE, C.CONTRACT,
                        O.OPT_EXCHANGE, O.OPT_EXPIRY, O.OPT_SEC_TYPE, O.SYM,
                         U.CURRENCY

        dctOPT = lstOPT.ToDictionary(Function(Z) Z.ID)

end sub

这会编译,但在其他程序中我无法访问dctOPT

dim dctOPT = lstOPT.ToDictionary(Function(Z) Z.ID)

我是否需要将dctOPT复制到另一个公共字典中,还是有更简单的方法?有什么建议吗?

1 个答案:

答案 0 :(得分:1)

你需要这个:

Public dctOPT As New Dictionary(Of Integer, Object)

Sub Get_RTD_OPT()

    Dim lstOPT =
        From C In DATA.CHAINs, O In DATA.OPTIONs, U In DATA.UDLies
        Where C.CONTRACT = O.CONTRACT And O.UDLY_SYM = U.UDLY_SYM
        Select C.ID, C.P_C, C.STRIKE, C.CONTRACT,
           O.OPT_EXCHANGE, O.OPT_EXPIRY, O.OPT_SEC_TYPE, O.SYM,
            U.CURRENCY

    dctOPT = lstOPT.ToDictionary(Function(Z) Z.ID, Function(Z) CType(Z, Object))

End Sub

如果没有Function(Z) CType(Z, Object),则创建的字典类型为Dictionary(Of Integer, <anonymous>),并且无法直接分配给Dictionary(Of Integer, Object)。强制转换正确生成了正确类型的字典。