C++中含有union的stuct，怎么在C#中定义

C++中含有union的stuct，如何在C#中定义

C/C++ code

typedef struct tagMarket {                        union {        WORD            m_wMarket;                    char            m_EShortName[3];        };    char            m_Name[16];                    char            m_CShortName[5];            unsigned long    m_lProperty;                unsigned long    m_lDate;                    short            m_PeriodCount;                short            m_OpenTime[5];                short            m_CloseTime[5];                short            m_nCount;                    StockInfo       m_Siif[1];   } SCMarket;