Develop Reference

Get IP address from Android and IOS Device using .NET MAUI

I am trying to get IP address from android device using .NET MAUI. (Current android framework net6.0-android)
With the below code, I can get the IP with the first launch of the application. And it does not work with following launch of the application unless I reboot my phone.(Tested on Samsung S10+ Android 12)
private void GetIPAddressClicked(object sender, EventArgs e)
{
string interfaceDescription = string.Empty;
var result = new List<IPAddress>();
try
{
var upAndNotLoopbackNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces().Where(n => n.NetworkInterfaceType != NetworkInterfaceType.Loopback
&& n.OperationalStatus == OperationalStatus.Up);
foreach (var networkInterface in upAndNotLoopbackNetworkInterfaces)
{
var iPInterfaceProperties = networkInterface.GetIPProperties();
var unicastIpAddressInformation = iPInterfaceProperties.UnicastAddresses.FirstOrDefault(u => u.Address.AddressFamily == AddressFamily.InterNetwork);
if (unicastIpAddressInformation == null) continue;
result.Add(unicastIpAddressInformation.Address);
interfaceDescription += networkInterface.Description + "---";
}
}
catch (Exception ex)
{
Debug.WriteLine($"Unable to find IP: {ex.Message}");
}
finally
{
string allIpInfo = string.Empty;
foreach (var item in result)
{
allIpInfo += item.ToString() + "---";
}
IPAddress.Text = allIpInfo;
InterfaceName.Text = interfaceDescription;
}
When it works,
interfaceDescription = "------"
allIpInfo = "192.168.50.112---127.0.0.1---"
When it does not work,
interfaceDescription ---> rmnet_data0
allIpInfo ---> 192.0.0.2
I am not sure what is wrong here. How can I fix this? Or is there a better way to get the IP address?
Thanks.

How do i get Physical Address of a mac os x device by using c#

I am using visual studio for mac using c#. I have tried system.net.networkinformation but it gives me blank string.
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
if (nic.OperationalStatus == OperationalStatus.Up)
{
mac += nic.GetPhysicalAddress().ToString();
//Console.WriteLine(mac);
break;
}
}
This is what i am using to get mac address. It works fine in windows desktop application but not working in os x. I am trying to get mac address of mac desktop for its unique identification.

Below function gives exact mac addresses which i need.
public static string GetMacAddress()
{
System.Net.NetworkInformation.NetworkInterfaceType Type = 0;
string MacAddress = string.Empty;
try
{
System.Net.NetworkInformation.NetworkInterface[] theNetworkInterfaces = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
foreach (System.Net.NetworkInformation.NetworkInterface currentInterface in theNetworkInterfaces)
{
Type = currentInterface.NetworkInterfaceType;
if (Type == System.Net.NetworkInformation.NetworkInterfaceType.Ethernet || Type == System.Net.NetworkInformation.NetworkInterfaceType.GigabitEthernet || Type == System.Net.NetworkInformation.NetworkInterfaceType.FastEthernetFx)
{
MacAddress = currentInterface.GetPhysicalAddress().ToString();
break;
}
}
return MacAddress;
}
catch
{
// your code goes here
}
}

C# Local IP is not correct with multiple Ethernet

I need to get the Local IP address of PC but if pc is connected to multiple network the ip is not correct.
I'm using:
public static string GetIPAddress()
{
IPHostEntry host;
string localIP = "?";
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
localIP = ip.ToString();
}
}
return localIP;
}
Like:
I need get the local ip of adapter with internet or all local ip address.

I can see 2 options:
option 1
loop trough all interfaces using System.Net.NetworkInformation:
static List<IPAddress> GetIpAddress()
{
List<IPAddress> AllIps = new List<IPAddress>();
foreach (NetworkInterface netif in NetworkInterface.GetAllNetworkInterfaces())
{
IPInterfaceProperties properties = netif.GetIPProperties();
foreach (IPAddressInformation unicast in properties.UnicastAddresses)
{
AllIps.Add(unicast.Address);
Console.WriteLine(unicast.Address);
}
}
return AllIps;
}
option 2
find the default gateway to the internet, then match the default gateway address to the interface addresses you found:
public static IPAddress GetDefaultGateway()
{
IPAddress result = null;
var cards = NetworkInterface.GetAllNetworkInterfaces().ToList();
if (cards.Any())
{
foreach (var card in cards)
{
var props = card.GetIPProperties();
if (props == null)
continue;
var gateways = props.GatewayAddresses;
if (!gateways.Any())
continue;
var gateway =
gateways.FirstOrDefault(g => g.Address.AddressFamily.ToString() == "InterNetwork");
if (gateway == null)
continue;
result = gateway.Address;
break;
};
}
return result;
}
now you can combine the 2 options in order to find the interface that is connected to the internet. here is my suggestion to match the default gateway to the correct adapter address. you can also determine the IP address classes
using the IpClass Enumeration that is written in the code i have added:
static void Main(string[] args)
{
// find all interfaces ip adressess
var allAdaptersIp = GetIpAddress();
// find the default gateway
var dg = GetDefaultGateway();
// match the default gateway to the host address => the interface that is connected to the internet => that print host address
Console.WriteLine("ip address that will route you to the world: " + GetInterNetworkHostIp(ref allAdaptersIp, dg, IpClass.ClassC));
Console.ReadLine();
}
enum IpClass
{
ClassA,
ClassB,
ClassC
}
static string GetInterNetworkHostIp(ref List<IPAddress> adapters, IPAddress dg, IpClass ipclassenum)
{
string networkAddress = "";
var result = "" ;
switch (ipclassenum)
{
case IpClass.ClassA:
networkAddress = dg.ToString().Substring(0, dg.ToString().Length - dg.ToString().LastIndexOf(".") );
break;
case IpClass.ClassB:
networkAddress = dg.ToString().Substring(0, dg.ToString().Length - dg.ToString().IndexOf(".",3));
break;
case IpClass.ClassC:
networkAddress = dg.ToString().Substring(0, dg.ToString().Length- dg.ToString().IndexOf(".") );
break;
default:
break;
}
foreach (IPAddress ip in adapters)
{
if (ip.ToString().Contains(networkAddress))
{
result = ip.ToString();
break;
}
}
if (result == "")
result = "no ip was found";
return result;
}

How to set IP address of device connected to Host PC? C# Winform?

I have a Modbus TCP/IP to MODBUS RTU converter , which comes with a default IP of 192.168.0.1 . I need to develop a small c# Winform app to change this device's IP address to any desired IP address. How do I do that?.

You could do it with WMI (Windows Management Instrumentation).
First, you have to add the reference for System.Management to your Project.
Second, you need to find the NetworkInterface for your network connection by name:
using System.Net.NetworkInformation;
using System.Management;
public class NetworkManager
{
public static NetworkInterface GetNetworkInterface(string sName)
{
NetworkInterface NetInterface = null;
// Precondition
if (sName == "") return null;
NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface ni in interfaces)
{
if (ni.Name == sName)
{
NetInterface = ni;
break;
}
}
return NetInterface;
}
Third, you have to create a ManagementObject for your NetworkInterface:
public static ManagementObject GetNetworkAdapterManagementObject(NetworkInterface NetInterface)
{
ManagementObject oMngObj = null;
// Precondition
if (NetInterface == null) return null;
string sNI = NetInterface.Id;
ManagementClass oMC = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection oMOC = oMC.GetInstances();
foreach (ManagementObject oMO in oMOC)
{
string sMO = oMO["SettingID"].ToString();
if (sMO == sNI)
{
// Found
oMngObj = oMO;
break;
}
}
return oMngObj;
}
Fours, you can set the ipadress with:
public static bool SetIPAdress(ManagementObject oMO, string[] saIPAdress, string[] saSubnetMask)
{
bool bErg = false;
try
{
// Precondition
if (oMO == null) return false;
if (saIPAdress == null) return false;
if (saSubnetMask == null) return false;
// Get ManagementBaseObject
ManagementBaseObject oNewIP = null;
oNewIP = oMO.GetMethodParameters("EnableStatic");
oNewIP["IPAddress"] = saIPAdress;
oNewIP["SubnetMask"] = saSubnetMask;
// Invoke
oMO.InvokeMethod("EnableStatic", oNewIP, null);
// Alles ok
bErg = true;
}
catch (Exception ex)
{
Console.WriteLine("SetIPAdress failed: " + ex.Message);
}
return bErg;
}
}
Now you can use it, for example in a button click event handler:
private void button1_Click(object sender, EventArgs e)
{
string sConn = "LAN-Verbindung";
NetworkInterface oNI = NetworkManager.GetNetworkInterface(sConn);
ManagementObject oMO = NetworkManager.GetNetworkAdapterManagementObject(oNI);
string sIPAdress = "192.168.1.1";
string sSubnetMask = "255.255.255.0";
string[] saIPAdress = {sIPAdress};
string[] saSubnetMask = {sSubnetMask};
if (NetworkManager.SetIPAdress(oMO, saIPAdress, saSubnetMask))
{
Console.WriteLine("Yes...");
}
}
Depending on the policies on your pc, may be you have to run the program as Administrator...

C# Get Computer's MAC address "OFFLINE"

Is there any way to get computer's mac address when there is no internet connection in c#?
I'am able to get when I have connection but not able to get when I am offline. But strongly I need the mac address for my work.
My online code;
var macAddr =
(from nic in NetworkInterface.GetAllNetworkInterfaces()
where nic.OperationalStatus == OperationalStatus.Up
select nic.GetPhysicalAddress().ToString()).FirstOrDefault();

From WMI:
public static string GetMACAddress1()
{
ManagementObjectSearcher objMOS = new ManagementObjectSearcher("Select * FROM Win32_NetworkAdapterConfiguration");
ManagementObjectCollection objMOC = objMOS.Get();
string macAddress = String.Empty;
foreach (ManagementObject objMO in objMOC)
{
object tempMacAddrObj = objMO["MacAddress"];
if (tempMacAddrObj == null) //Skip objects without a MACAddress
{
continue;
}
if (macAddress == String.Empty) // only return MAC Address from first card that has a MAC Address
{
macAddress = tempMacAddrObj.ToString();
}
objMO.Dispose();
}
macAddress = macAddress.Replace(":", "");
return macAddress;
}
From System.Net namespace:
public static string GetMACAddress2()
{
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
String sMacAddress = string.Empty;
foreach (NetworkInterface adapter in nics)
{
if (sMacAddress == String.Empty)// only return MAC Address from first card
{
//IPInterfaceProperties properties = adapter.GetIPProperties(); Line is not required
sMacAddress = adapter.GetPhysicalAddress().ToString();
}
} return sMacAddress;
}
Slightly modified from How to get the MAC address of system - C-Sharp Corner

You can use WMI in C# (System.Management) to get a list of Win32_NetworkAdapter's which contains a MACAddress property.
http://msdn.microsoft.com/en-gb/library/windows/desktop/aa394216(v=vs.85).aspx