C#中通过IP获取MAC地址，获取本机IP和MAC地址

protected void Page_Load(object sender, EventArgs e)
{
Response.Write("MAC地址为："+GetMACAddress()+"IP地址为："+GetAddress()+"<br>");
Response.Write("mac是:" + GetMACByIP("192.168.100.3")+"<br>");
Response.Write("mac是:" + GetMACByIP(GetAddress()));
}

//获取本机MAC地址
public static string GetMACAddress()
{
string MoAddress = "";
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
if ((bool)mo["IPEnabled"] == true)
MoAddress = mo["MacAddress"].ToString();
mo.Dispose();
}
return MoAddress;
}

注意：1.使用程序集system.management
2.使用命名空间system.management
你必须把system.management这个dll引用进你的工程中来。
不然的话找不到这个dll，也找不到引用的命名空间和类。
//获取本机IP地址
public static string GetAddress()
{
string strHostName = Dns.GetHostName(); //得到本机的主机名
IPHostEntry ipEntry = Dns.GetHostByName(strHostName); //取得本机IP
return ipEntry.AddressList[0].ToString();
}

[DllImport("Iphlpapi.dll")]
private static extern int SendARP(Int32 dest,Int32 host,byte[] mac,ref Int32 length);
[DllImport("Ws2_32.dll")]
private static extern Int32 inet_addr(string ip);

/// <summary>
/// 根据ip得到网卡mac地址
/// </summary>
/// <param name="ip">给出的ip地址</param>
/// <returns>对应ip的网卡mac地址</returns>
public static string GetMACByIP(string ip)
{
try
{
byte[] aa=new byte[6];

Int32 ldest= inet_addr(ip); //目的地的ip

Int64 macinfo = new Int64();
Int32 len = 6;
int res = SendARP(ldest,0, aa, ref len);

return BitConverter.ToString( aa, 0, 6 );;
}
catch(Exception err)
{
throw err;
}