C# implements the method of obtaining MAC address

/// <summary>
/// Get the mac address according to the network card type/// </summary>
/// <param name="networkType">Network card type</param>/// <param name="macAddressFormatHanlder">Format obtained mac address</param>/// <returns>The obtained mac address</returns>public static string GetMacAddress(NetworkInterfaceType networkType, Func&lt;string, string&gt; macAddressFormatHanlder)
{
  string _mac = ;
  NetworkInterface[] _networkInterfaces = ();
  foreach (NetworkInterface adapter in _networkInterfaces)
  {
 if ( == networkType)
 {
   _mac = ().ToString();
   if (!(_mac))
 break;
 }
  }
  if (macAddressFormatHanlder != null)
 _mac = macAddressFormatHanlder(_mac);
  return _mac;
}
/// &lt;summary&gt;
/// Obtain the mac address according to the network card type and network card status/// &lt;/summary&gt;
/// <param name="networkType">Network card type</param>/// <param name="status">Network card status</param>///Up The network interface is running and can transmit data packets.///Down The network interface cannot transmit data packets.///Testing The network interface is running tests.///Unknown The status of the network interface is unknown.///Dormant The network interface is not in the state of transmitting packets; it is waiting for an external event.///NotPresent Due to missing components (usually hardware components), the network interface cannot transmit packets.///The LowerLayerDown network interface cannot transmit packets because it runs on one or more other interfaces, and at least one of these "lower layer" interfaces is closed./// <param name="macAddressFormatHanlder">Format obtained mac address</param>/// <returns>The obtained mac address</returns>public static string GetMacAddress(NetworkInterfaceType networkType, OperationalStatus status, Func&lt;string, string&gt; macAddressFormatHanlder)
{
  string _mac = ;
  NetworkInterface[] _networkInterfaces = ();
  foreach (NetworkInterface adapter in _networkInterfaces)
  {
 if ( == networkType)
 {
   if ( != status) continue;
   _mac = ().ToString();
   if (!(_mac)) break;
 }
  }
  if (macAddressFormatHanlder != null)
 _mac = macAddressFormatHanlder(_mac);
  return _mac;
}
/// &lt;summary&gt;
/// Get the first mac address you read/// &lt;/summary&gt;
/// <returns>The obtained mac address</returns>public static string GetMacAddress(Func&lt;string, string&gt; macAddressFormatHanlder)
{
  string _mac = ;
  NetworkInterface[] _networkInterfaces = ();
  foreach (NetworkInterface adapter in _networkInterfaces)
  {
 _mac = ().ToString();
 if (!(_mac))
   break;
  }
  if (macAddressFormatHanlder != null)
 _mac = macAddressFormatHanlder(_mac);
  return _mac;
}