C#如何用结构体直接读取二进制文件的内容

 [StructLayout(LayoutKind.Sequential)]

        public struct BYTE_4

        {

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]

            public byte[] col;

        }



        [StructLayout(LayoutKind.Sequential)]

        public struct BYTE_6

        {

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]

            public byte[] col;

        }



        [StructLayout(LayoutKind.Sequential)]

        public struct BYTE_2_4

        {



            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)] //注意：这里对应一维数组[/b]    

            public BYTE_4[] row;

        }



        public struct BYTE_2_6

        {



            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)] //注意：这里对应一维数组[/b]    

            public BYTE_6[] row;

        }



        public struct netBaseParamStructure //网络基本参数

        {

            public BYTE_2_4 bytIP ;  //0 To 1:A网口和B网口，0 To 3：每个IP地址占用共4个字节

            public BYTE_2_4 bytMask ;   //地址掩码

            public BYTE_2_4 bytGateWay; //网关信息

            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]

            public byte[] ISMacAsigned;

            public BYTE_2_6 MacAsigned;//= new Byte[2, 6];/

            public Byte SNtpVer;                      

            public Byte uiencast;                     

        }

  using (var reader = new BinaryReader(File.OpenRead(filename)))

              {

                  reader.BaseStream.Seek(0, SeekOrigin.Begin);

                  reader.Read(data, 0, 40);

              }

          //data 数组赋值给结构体

           int _StuctSize = Marshal.SizeOf(typeof(netBaseParamStructure));

            Console.WriteLine(_StuctSize);

            IntPtr _StructIntPtr = Marshal.AllocHGlobal(_StuctSize);

            Marshal.Copy(data, 0, _StructIntPtr, _StuctSize);

            object _StructObject = Marshal.PtrToStructure(_StructIntPtr, typeof(netBaseParamStructure));

            Marshal.FreeHGlobal(_StructIntPtr);

            netBaseParamStructure _Image = (netBaseParamStructure)_StructObject