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C#获取机器的mac地址的时候，会用到Win32_NetworkAdapterConfiguration类，像如下代码：

/// <summary>
/// 获取MAC地址
/// </summary>
/// <returns></returns>
public string GetNetCardMacAddress()
{
	ManagementClass mc;
	ManagementObjectCollection moc;
	mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
	moc = mc.GetInstances();
	string str = "";
	foreach (ManagementObject mo in moc)
	{
		if ((bool)mo["IPEnabled"] == true)
		{
			str = mo["MacAddress"].ToString();
			break;
		}
	}
	return str;
}

那么ManagementObject类除索引“IPEnabled”与“MacAddress”这两个之后还有哪些其它的属性呢？以下就是其它的属性：

class Win32_NetworkAdapterConfiguration : CIM_Setting
{
  boolean  ArpAlwaysSourceRoute;
  boolean  ArpUseEtherSNAP;
  string   Caption;
  string   DatabasePath;
  boolean  DeadGWDetectEnabled;
  string   DefaultIPGateway[];
  uint8    DefaultTOS;
  uint8    DefaultTTL;
  string   Description;
  boolean  DHCPEnabled;
  datetime DHCPLeaseExpires;
  datetime DHCPLeaseObtained;
  string   DHCPServer;
  string   DNSDomain;
  string   DNSDomainSuffixSearchOrder[];
  boolean  DNSEnabledForWINSResolution;
  string   DNSHostName;
  string   DNSServerSearchOrder[];
  boolean  DomainDNSRegistrationEnabled;
  uint32   ForwardBufferMemory;
  boolean  FullDNSRegistrationEnabled;
  uint16   GatewayCostMetric[];
  uint8    IGMPLevel;
  uint32   Index;
  uint32   InterfaceIndex;
  string   IPAddress[];
  uint32   IPConnectionMetric;
  boolean  IPEnabled;
  boolean  IPFilterSecurityEnabled;
  boolean  IPPortSecurityEnabled;
  string   IPSecPermitIPProtocols[];
  string   IPSecPermitTCPPorts[];
  string   IPSecPermitUDPPorts[];
  string   IPSubnet[];
  boolean  IPUseZeroBroadcast;
  string   IPXAddress;
  boolean  IPXEnabled;
  uint32   IPXFrameType[];
  uint32   IPXMediaType;
  string   IPXNetworkNumber[];
  string   IPXVirtualNetNumber;
  uint32   KeepAliveInterval;
  uint32   KeepAliveTime;
  string   MACAddress;
  uint32   MTU;
  uint32   NumForwardPackets;
  boolean  PMTUBHDetectEnabled;
  boolean  PMTUDiscoveryEnabled;
  string   ServiceName;
  string   SettingID;
  uint32   TcpipNetbiosOptions;
  uint32   TcpMaxConnectRetransmissions;
  uint32   TcpMaxDataRetransmissions;
  uint32   TcpNumConnections;
  boolean  TcpUseRFC1122UrgentPointer;
  uint16   TcpWindowSize;
  boolean  WINSEnableLMHostsLookup;
  string   WINSHostLookupFile;
  string   WINSPrimaryServer;
  string   WINSScopeID;
  string   WINSSecondaryServer;
};

详细见http://msdn.microsoft.com/en-us/library/aa394217(v=VS.85).aspx

有的时候，还会用到这样方法，当网卡有多个的时候，判断其中哪个开启了，然后获取启用的那个网卡的mac地址：

string mac = "网卡未配置";
ManagementClass mc;
mc = new ManagementClass("Win32_NetworkAdapter");
ManagementObjectCollection moc = mc.GetInstances();
foreach (ManagementObject mo in moc)
{
	if (mo["NetConnectionStatus"]!=null&&mo["NetConnectionStatus"].ToString()=="2")
	{
		mac = mo["MacAddress"].ToString();
		mo.Dispose();
		break;
	}
}

Win32_NetworkAdapter类中的其它属性如下：

class Win32_NetworkAdapter : CIM_NetworkAdapter
{
  string   AdapterType;
  uint16   AdapterTypeID;
  boolean  AutoSense;
  uint16   Availability;
  string   Caption;
  uint32   ConfigManagerErrorCode;
  boolean  ConfigManagerUserConfig;
  string   CreationClassName;
  string   Description;
  string   DeviceID;
  boolean  ErrorCleared;
  string   ErrorDescription;
  string   GUID;
  uint32   Index;
  datetime InstallDate;
  boolean  Installed;
  uint32   InterfaceIndex;
  uint32   LastErrorCode;
  string   MACAddress;
  string   Manufacturer;
  uint32   MaxNumberControlled;
  uint64   MaxSpeed;
  string   Name;
  string   NetConnectionID;
  uint16   NetConnectionStatus;
  boolean  NetEnabled;
  string   NetworkAddresses[];
  string   PermanentAddress;
  boolean  PhysicalAdapter;
  string   PNPDeviceID;
  uint16   PowerManagementCapabilities[];
  boolean  PowerManagementSupported;
  string   ProductName;
  string   ServiceName;
  uint64   Speed;
  string   Status;
  uint16   StatusInfo;
  string   SystemCreationClassName;
  string   SystemName;
  datetime TimeOfLastReset;
};