An example of the method of obtaining MacAddress address by asp.net core

Time:2019-10-4

This article tells you how to get Mac address in dotnet core

Because dotnetcore is not directly related to hardware, it is impossible to obtain the Mac address of the current device through WMI method.

But dotnet core can use the following code to get all network card addresses, including physical and virtual network cards.


IPGlobalProperties computerProperties = IPGlobalProperties.GetIPGlobalProperties();
   NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();

   Console.WriteLine("Interface information for {0}.{1}  ",
    computerProperties.HostName, computerProperties.DomainName);
   if (nics == null || nics.Length < 1)
   {
    Console.WriteLine(" No network interfaces found.");
    return;
   }

   Console.WriteLine(" Number of interfaces .................... : {0}", nics.Length);
   foreach (NetworkInterface adapter in nics)
   {
    Console.WriteLine();
    Console.WriteLine(adapter.Name + "," + adapter.Description);
    Console.WriteLine(String.Empty.PadLeft(adapter.Description.Length, '='));
    Console.WriteLine(" Interface type .......................... : {0}", adapter.NetworkInterfaceType);
    Console.Write(" Physical address ........................ : ");
    PhysicalAddress address = adapter.GetPhysicalAddress();
    byte[] bytes = address.GetAddressBytes();
    for (int i = 0; i < bytes.Length; i++)
    {
     // Display the physical address in hexadecimal.
     Console.Write("{0}", bytes[i].ToString("X2"));
     // Insert a hyphen after each byte, unless we are at the end of the 
     // address.
     if (i != bytes.Length - 1)
     {
      Console.Write("-");
     }
    }

    Console.WriteLine();
   }

Run the code. Here’s the console


Interface information for lindexi.github
    Number of interfaces .................... : 6

    Hyper-V Virtual Ethernet Adapter #4
    ===================================
    Interface type .......................... : Ethernet
    Physical address ........................ : 00-15-5D-96-39-03

    Hyper-V Virtual Ethernet Adapter #3
    ===================================
    Interface type .......................... : Ethernet
    Physical address ........................ : 1C-1B-0D-3C-47-91

    Software Loopback Interface 1
    =============================
    Interface type .......................... : Loopback
    Physical address ........................ :

    Microsoft Teredo Tunneling Adapter
    ==================================
    Interface type .......................... : Tunnel
    Physical address ........................ : 00-00-00-00-00-00-00-E0

    Hyper-V Virtual Ethernet Adapter
    ================================
    Interface type .......................... : Ethernet
    Physical address ........................ : 5A-15-31-73-B0-9F

    Hyper-V Virtual Ethernet Adapter #2
    ===================================
    Interface type .......................... : Ethernet
    Physical address ........................ : 5A-15-31-08-13-B1

But you can see that there are a lot of network cards that do not need to be used. The way to get the current active IP network card from the stack network can first determine whether it is a local itinerant network, and then determine whether there is a network or not.


foreach (NetworkInterface adapter in nics.Where(c =>
    c.NetworkInterfaceType != NetworkInterfaceType.Loopback && c.OperationalStatus == OperationalStatus.Up))

It is necessary to get the current network card with or without IP and IP

IPInterfaceProperties properties = adapter.GetIPProperties();

    var unicastAddresses = properties.UnicastAddresses;
    foreach (var temp in unicastAddresses.Where(temp =>
     temp.Address.AddressFamily == AddressFamily.InterNetwork))
    {
     // This is the network card you need.
    }

Simple output network card uses adapter. GetPhysical Address (). ToString () output. If you need to output with connection, use GetAddressBytes and output by yourself.

The following code is extracted by me and can be used directly.


public static void GetActiveMacAddress(string separator = "-")
  {
   NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();

   //Debug.WriteLine("Interface information for {0}.{1}  ",
   // computerProperties.HostName, computerProperties.DomainName);
   if (nics == null || nics.Length < 1)
   {
    Debug.WriteLine(" No network interfaces found.");
    return;
   }

   var macAddress = new List<string>();

   //Debug.WriteLine(" Number of interfaces .................... : {0}", nics.Length);
   foreach (NetworkInterface adapter in nics.Where(c =>
    c.NetworkInterfaceType != NetworkInterfaceType.Loopback && c.OperationalStatus == OperationalStatus.Up))
   {
    //Debug.WriteLine("");
    //Debug.WriteLine(adapter.Name + "," + adapter.Description);
    //Debug.WriteLine(string.Empty.PadLeft(adapter.Description.Length, '='));
    //Debug.WriteLine(" Interface type .......................... : {0}", adapter.NetworkInterfaceType);
    //Debug.Write(" Physical address ........................ : ");
    //PhysicalAddress address = adapter.GetPhysicalAddress();
    //byte[] bytes = address.GetAddressBytes();
    //for (int i = 0; i < bytes.Length; i++)
    //{
    // // Display the physical address in hexadecimal.
    // Debug.Write($"{bytes[i]:X2}");
    // // Insert a hyphen after each byte, unless we are at the end of the 
    // // address.
    // if (i != bytes.Length - 1)
    // {
    //  Debug.Write("-");
    // }
    //}

    //Debug.WriteLine("");

    //Debug.WriteLine(address.ToString());

    IPInterfaceProperties properties = adapter.GetIPProperties();

    var unicastAddresses = properties.UnicastAddresses;
    if (unicastAddresses.Any(temp => temp.Address.AddressFamily == AddressFamily.InterNetwork))
    {
     var address = adapter.GetPhysicalAddress();
     if (string.IsNullOrEmpty(separator))
     {
      macAddress.Add(address.ToString());
     }
     else
     {
      macAddress.Add(string.Join(separator, address.GetAddressBytes()));
     }
    }
   }
  }

The above method can be used not only in dotnet core, but also in dotnet framework, but also through WMI.

Using WMI to Get MAC Address in dotnet Framework


var managementClass = new ManagementClass("Win32_NetworkAdapterConfiguration");
     var managementObjectCollection = managementClass.GetInstances();
     foreach (var managementObject in managementObjectCollection.OfType<ManagementObject>())
     {
      using (managementObject)
      {
       if ((bool) managementObject["IPEnabled"])
       {
        if (managementObject["MacAddress"] == null)
        {
         return string.Empty;
        }

        return managementObject["MacAddress"].ToString().ToUpper();
       }
      }
     }

The output format is 5A:15:31:73:B0:9F and the output is a network card.

NetworkInterface.GetPhysicalAddress Method (System.Net.NetworkInformation)

PhysicalAddress Class (System.Net.NetworkInformation)

c# – .NET Core 2.x how to get the current active local network IPv4 address? – Stack Overflow

The above is the whole content of this article. I hope it will be helpful to everyone’s study, and I hope you will support developpaer more.