代码语言：javascript复制
using System.Net;
using System.Net.NetworkInformation;
/// <summary>
/// Holds utilities for working with networks, Ethernet, etc.
/// </summary>
public static class NetworkUtils
{
//
http://www.codeproject.com/KB/IP/host_info_within_network.aspx
[System.Runtime.InteropServices.DllImport("iphlpapi.dll",
ExactSpelling = true)]
static extern int SendARP(int DestIP, int SrcIP, byte[]
pMacAddr, ref int PhyAddrLen);
/// <summary>
/// Gets the MAC address (<see cref="PhysicalAddress"/>)
associated with the specified IP.
/// </summary>
/// <param name="ipAddress">The remote IP address.</param>
/// <returns>The remote machine's MAC address.</returns>
public static PhysicalAddress GetMacAddress(IPAddress
ipAddress)
{
const int MacAddressLength = 6;
int length = MacAddressLength;
var macBytes = new byte[MacAddressLength];
SendARP(BitConverter.ToInt32(ipAddress.GetAddressBytes(),
0), 0, macBytes, ref length);
return new PhysicalAddress(macBytes);
}
}
[TestClass()]
public class NetworkUtilsTests
{
[TestMethod()]
public void GetMacAddress_BroadcastIP_NonzeroMac()
{
IPAddress ipAddress = IPAddress.Broadcast;
PhysicalAddress actual = NetworkUtils.GetMacAddress
(ipAddress);
Console.WriteLine(actual.ToString());
Assert.AreNotEqual(PhysicalAddress.None, actual);
}
}</pre> 
