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C#通过SendARP读取MAC地址

///<summary>
/// 通过SendARP获取网卡Mac
/// 网络被禁用或未接入网络（如没插网线）时此方法失灵
///</summary>
///<param name="remoteIP"></param>
///<returns></returns>
publicstaticstring GetMacBySendARP(string remoteIP)
{
  StringBuilder macAddress =new StringBuilder();

  try
  {
    Int32 remote = inet_addr(remoteIP);

    Int64 macInfo =new Int64();
    Int32 length =6;
    SendARP(remote, 0, ref macInfo, ref length);

    string temp = Convert.ToString(macInfo, 16).PadLeft(12, '0').ToUpper();

    int x =12;
    for (int i =0; i <6; i++)
    {
      if (i ==5)
      {
        macAddress.Append(temp.Substring(x -2, 2));
      }
      else
      {
        macAddress.Append(temp.Substring(x -2, 2) +"-");
      }
      x -=2;
    }

    return macAddress.ToString();
  }
  catch
  {
    return macAddress.ToString();
  }
}

[DllImport("Iphlpapi.dll")]
privatestaticexternint SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
[DllImport("Ws2_32.dll")]
privatestaticextern Int32 inet_addr(string ip);