需要通过串口通信，对方是C++写的程序，通信结构体为
 
  [StructLayout(LayoutKind.Sequential)]
    public struct BT_BLADE_INFO
    {
        public byte state;              
      public byte reserved;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
        public byte[] cpu_tmp;         
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public byte[] bld_ip;   
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public byte[] bld_netmask;
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
        public byte[] bld_gateway;

    }

 [StructLayout(LayoutKind.Sequential)]
    public struct BT_PACKAGE_DWON
    {
        public byte head;
        public byte package_type;
        public short verify_value;      
        [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
        public BT_BLADE_INFO[] blade_info;
    }

   现在需要把这个结构体转换为byte流进行通信，程序如下：
    BT_PACKAGE_DWON down_package = new BT_PACKAGE_DWON();
    int aaa = Marshal.SizeOf(down_package);

    现在总是报错
    A first chance exception of type 'System.NotSupportedException' occurred in mscorlib.dll
An unhandled exception of type 'System.NotSupportedException' occurred in mscorlib.dll

    用Marshal.StructureToPtr也是一样的错误，我的程序是在wince5.0下执行，哪位知道这是为什么？或者说这个嵌套结构体该如何实现？

    谢谢！

两个结构的C++里是如何定义的？

在C++里面是这样的

typedef struct
{
    char state;        // 0: off line; 1: power off; 2: power on; 7: communication lost
    char reserved;
    char cpu_tmp[2];  // temperature: cpu1 & cpu2
    char bld_ip[4];    // ip info: ip[3]. Ip[2]. ip[1]. ip[0]
    char bld_netmask[4];
    char bld_gateway[4];
}BT_BLADE_INFO;

struct bt_package_up
{
char head;
char package_type;
short verify_value;
BT_BLADE_INFO blade_info[10];
}
谢谢版主关注

能解决这种嵌套的结构吗？

不知道行不行，呵呵。
[StructLayout(LayoutKind.Explicit]
public struct BT_BLADE_INFO
{
[FieldOffset(0)] public byte state;
[FieldOffset(1)] public byte reserved;
[FieldOffset(2)] public byte[] cpu_tmp;
[FieldOffset(4)] public byte[] bld_ip;
[FieldOffset(8)] public byte[] bld_netmask;
[FieldOffset(12)] public byte[] bld_gateway;
}

[StructLayout(LayoutKind.Explicit]
public struct bt_package_up
{
[FieldOffset(0)] public byte head;
[FieldOffset(1)] public byte package_type;
[FieldOffset(2)] public short verify_value;
[FieldOffset(4)] public BT_BLADE_INFO[] blade_info;
}

谢谢版主
我还是放弃了，用C++做了一个dll来处理。

再次感谢