c# 结构体定制特性

  [StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
        class OSVersionInfo
        {
            public UInt32 OSVersionInfoSize = 0;
            public UInt32 MajorVersion = 0;
            public UInt32 Minorversion = 0;
            public UInt32 BuildNumber = 0;
            public UInt32 PlatformID = 0;

            [MarshalAs(UnmanagedType.ByValTStr,SizeConst=128)]
            public string OSDVersion = null;
        }