[StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
        public struct gooseData
        {
            /// <summary>
            /// 目标MAC
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
            public byte[] DMAC;
            /// <summary>
            /// 源MAC
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)]
            public byte[] SMAC;
            /// <summary>
            /// TPID=0x8100
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
            public byte[] TPID;
            /// <summary>
            /// TCI=0x8000
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
            public byte[] TCI;
            /// <summary>
            /// APPID=0x88b8
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)]
            public byte[] APPID;
            /// <summary>
            /// data=110(bytes)
            /// </summary>
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 110)]
            public byte[] Data;

        }
我以太网收到一帧数组（128个字节）数据，然后想把数据放入以上结构体中，然后从结构体内取值、显示。请各位帮帮忙！！

花了点时间搞出来了

gooseData ConvertFromArray(byte[] txt)
{
    IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(gooseData)));
    if (p != IntPtr.Zero)
    {
        try
        {
            int size = Marshal.SizeOf(typeof(gooseData));
            Marshal.Copy(txt, 0, p, Math.Min(size, txt.Length));
            gooseData s = (gooseData)Marshal.PtrToStructure(p, typeof(gooseData));
            return s;
        }
        finally
        {
            Marshal.FreeHGlobal(p);
        }
    }
    throw new Exception("Out of memory");
}

谢谢黑侠的指导！
问下，你这里的txt是从文本中读吗？我是直接从以太网收的数据。我先试试你的。