blocks|key|1560889|text|您可以输入NIC+ID：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1560890|+foreach+(NetworkInterface+nic+in+NetworkInterface.GetAllNetworkInterfaces())+{
+++++if+(nic.OperationalStatus+==+OperationalStatus.Up){
+++++++++if+(nic.Id+==+"yay!")
+++++}
+}|code-block|syntax|javascript|1560891|它不是MAC地址，但它是唯一的标识符，如果这就是您要查找的。|1560892|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You could go for the NIC ID:

<pre><code> foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces()) {
 if (nic.OperationalStatus == OperationalStatus.Up){
 if (nic.Id == "yay!")
 }
 }
</code></pre>

It's not the MAC address, but it is a unique identifier, if that's what you're looking for.

blocks|key|1560930|text|ipconfig.exe是使用各种DLL实现的，包括iphlpapi.dll+...谷歌搜索iphlpapi会显示相应的MSDN文档。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1560931|entityMap^0|0|C|Q|C|1A|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

<code>ipconfig.exe</code> is implemented using various DLLs including <code>iphlpapi.dll</code> ... Googling for <code>iphlpapi</code> reveals a corresponding Win32 API documented in MSDN.

blocks|key|1345406|text|更干净的解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1345407|var+macAddr+=+
++++(
++++++++from+nic+in+NetworkInterface.GetAllNetworkInterfaces()
++++++++where+nic.OperationalStatus+==+OperationalStatus.Up
++++++++select+nic.GetPhysicalAddress().ToString()
++++).FirstOrDefault();|code-block|syntax|javascript|1345408|或者：|1345409|String+firstMacAddress+=+NetworkInterface
++++.GetAllNetworkInterfaces()
++++.Where(+nic+=>+nic.OperationalStatus+==+OperationalStatus.Up+&&+nic.NetworkInterfaceType+!=+NetworkInterfaceType.Loopback+)
++++.Select(+nic+=>+nic.GetPhysicalAddress().ToString()+)
++++.FirstOrDefault();|1345410|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Cleaner solution

<pre><code>var macAddr = 
 (
 from nic in NetworkInterface.GetAllNetworkInterfaces()
 where nic.OperationalStatus == OperationalStatus.Up
 select nic.GetPhysicalAddress().ToString()
 ).FirstOrDefault();
</code></pre>

Or:

<pre><code>String firstMacAddress = NetworkInterface
 .GetAllNetworkInterfaces()
 .Where( nic =&gt; nic.OperationalStatus == OperationalStatus.Up &amp;&amp; nic.NetworkInterfaceType != NetworkInterfaceType.Loopback )
 .Select( nic =&gt; nic.GetPhysicalAddress().ToString() )
 .FirstOrDefault();
</code></pre>

blocks|key|1561027|text|我们使用WMI来获取具有最低度量的接口的mac地址，例如，接口窗口将首选使用，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561028|public+static+string+GetMACAddress()
{
++++ManagementObjectSearcher+searcher+=+new+ManagementObjectSearcher("SELECT+*+FROM+Win32_NetworkAdapterConfiguration+where+IPEnabled=true");
++++IEnumerable<ManagementObject>+objects+=+searcher.Get().Cast<ManagementObject>();
++++string+mac+=+(from+o+in+objects+orderby+o["IPConnectionMetric"]+select+o["MACAddress"].ToString()).FirstOrDefault();
++++return+mac;
}|code-block|syntax|javascript|1561029|或者在Silverlight中(需要更高的信任)：|1561030|public+static+string+GetMACAddress()
{
++++string+mac+=+null;
++++if+((Application.Current.IsRunningOutOfBrowser)+&&+(Application.Current.HasElevatedPermissions)+&&+(AutomationFactory.IsAvailable))
++++{
++++++++dynamic+sWbemLocator+=+AutomationFactory.CreateObject("WbemScripting.SWBemLocator");
++++++++dynamic+sWbemServices+=+sWbemLocator.ConnectServer(".");
++++++++sWbemServices.Security_.ImpersonationLevel+=+3;+//impersonate

++++++++string+query+=+"SELECT+*+FROM+Win32_NetworkAdapterConfiguration+where+IPEnabled=true";
++++++++dynamic+results+=+sWbemServices.ExecQuery(query);

++++++++int+mtu+=+int.MaxValue;
++++++++foreach+(dynamic+result+in+results)
++++++++{
++++++++++++if+(result.IPConnectionMetric+<+mtu)
++++++++++++{
++++++++++++++++mtu+=+result.IPConnectionMetric;
++++++++++++++++mac+=+result.MACAddress;
++++++++++++}
++++++++}
++++}
++++return+mac;
}|1561031|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

We use WMI to get the mac address of the interface with the lowest metric, e.g. the interface windows will prefer to use, like this:

<pre><code>public static string GetMACAddress()
{
 ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
 IEnumerable&lt;ManagementObject&gt; objects = searcher.Get().Cast&lt;ManagementObject&gt;();
 string mac = (from o in objects orderby o["IPConnectionMetric"] select o["MACAddress"].ToString()).FirstOrDefault();
 return mac;
}
</code></pre>

Or in Silverlight (needs elevated trust):

<pre><code>public static string GetMACAddress()
{
 string mac = null;
 if ((Application.Current.IsRunningOutOfBrowser) &amp;&amp; (Application.Current.HasElevatedPermissions) &amp;&amp; (AutomationFactory.IsAvailable))
 {
 dynamic sWbemLocator = AutomationFactory.CreateObject("WbemScripting.SWBemLocator");
 dynamic sWbemServices = sWbemLocator.ConnectServer(".");
 sWbemServices.Security_.ImpersonationLevel = 3; //impersonate

 string query = "SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true";
 dynamic results = sWbemServices.ExecQuery(query);

 int mtu = int.MaxValue;
 foreach (dynamic result in results)
 {
 if (result.IPConnectionMetric &lt; mtu)
 {
 mtu = result.IPConnectionMetric;
 mac = result.MACAddress;
 }
 }
 }
 return mac;
}
</code></pre>

blocks|key|1345526|text|我真的很喜欢AVee的解决方案，具有最低的IP连接度量！但是，如果安装了具有相同度量的第二个nic，则MAC比较可能会失败...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1345527|最好将接口的描述与MAC一起存储。在以后的比较中，您可以通过此字符串识别正确的nic。下面是一个示例代码：|1345528|+++public+static+string+GetMacAndDescription()
++++{
++++++++ManagementObjectSearcher+searcher+=+new+ManagementObjectSearcher("SELECT+*+FROM+Win32_NetworkAdapterConfiguration+where+IPEnabled=true");
++++++++IEnumerable<ManagementObject>+objects+=+searcher.Get().Cast<ManagementObject>();
++++++++string+mac+=+(from+o+in+objects+orderby+o["IPConnectionMetric"]+select+o["MACAddress"].ToString()).FirstOrDefault();
++++++++string+description+=+(from+o+in+objects+orderby+o["IPConnectionMetric"]+select+o["Description"].ToString()).FirstOrDefault();
++++++++return+mac+%2B+";"+%2B+description;
++++}

++++public+static+string+GetMacByDescription(+string+description)
++++{
++++++++ManagementObjectSearcher+searcher+=+new+ManagementObjectSearcher("SELECT+*+FROM+Win32_NetworkAdapterConfiguration+where+IPEnabled=true");
++++++++IEnumerable<ManagementObject>+objects+=+searcher.Get().Cast<ManagementObject>();
++++++++string+mac+=+(from+o+in+objects+where+o["Description"].ToString()+==+description+select+o["MACAddress"].ToString()).FirstOrDefault();
++++++++return+mac;
++++}|code-block|syntax|javascript|1345529|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I really like AVee's solution with the lowest IP connection metric! But if a second nic with the same metric is installed, the MAC comparison could fail...

Better you store the description of the interface with the MAC. In later comparisons you can identify the right nic by this string. Here is a sample code:

<pre><code> public static string GetMacAndDescription()
 {
 ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
 IEnumerable&lt;ManagementObject&gt; objects = searcher.Get().Cast&lt;ManagementObject&gt;();
 string mac = (from o in objects orderby o["IPConnectionMetric"] select o["MACAddress"].ToString()).FirstOrDefault();
 string description = (from o in objects orderby o["IPConnectionMetric"] select o["Description"].ToString()).FirstOrDefault();
 return mac + ";" + description;
 }

 public static string GetMacByDescription( string description)
 {
 ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
 IEnumerable&lt;ManagementObject&gt; objects = searcher.Get().Cast&lt;ManagementObject&gt;();
 string mac = (from o in objects where o["Description"].ToString() == description select o["MACAddress"].ToString()).FirstOrDefault();
 return mac;
 }
</code></pre>

blocks|key|1345583|text|假设我有一个使用本地ip+192.168.0.182的TcpConnection。然后，如果我想知道该NIC的mac地址，我将把这个方法称为：GetMacAddressUsedByIp("192.168.0.182")。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1345584|public+static+string+GetMacAddressUsedByIp(string+ipAddress)
++++{
++++++++var+ips+=+new+List<string>();
++++++++string+output;

++++++++try
++++++++{
++++++++++++//+Start+the+child+process.
++++++++++++Process+p+=+new+Process();
++++++++++++//+Redirect+the+output+stream+of+the+child+process.
++++++++++++p.StartInfo.UseShellExecute+=+false;

++++++++++++p.StartInfo.RedirectStandardOutput+=+true;
++++++++++++p.StartInfo.UseShellExecute+=+false;
++++++++++++p.StartInfo.CreateNoWindow+=+true;
++++++++++++p.StartInfo.FileName+=+"ipconfig";
++++++++++++p.StartInfo.Arguments+=+"/all";
++++++++++++p.Start();
++++++++++++//+Do+not+wait+for+the+child+process+to+exit+before
++++++++++++//+reading+to+the+end+of+its+redirected+stream.
++++++++++++//+p.WaitForExit();
++++++++++++//+Read+the+output+stream+first+and+then+wait.
++++++++++++output+=+p.StandardOutput.ReadToEnd();
++++++++++++p.WaitForExit();

++++++++}
++++++++catch
++++++++{
++++++++++++return+null;
++++++++}

++++++++//+pattern+to+get+all+connections
++++++++var+pattern+=+@"(?xis)+
(?<Header>
+++++(\r%7C\n)+[%5E\r]%2B+:++\r\n\r\n
)
(?<content>
++++.%2B?+(?=+(+(\r\n\r\n)%7C($))+)
)";

++++++++List<Match>+matches+=+new+List<Match>();

++++++++foreach+(Match+m+in+Regex.Matches(output,+pattern))
++++++++++++matches.Add(m);

++++++++var+connection+=+matches.Select(m+=>+new
++++++++{
++++++++++++containsIp+=+m.Value.Contains(ipAddress),
++++++++++++containsPhysicalAddress+=+Regex.Match(m.Value,+@"(?ix)Physical+\s+Address").Success,
++++++++++++content+=+m.Value
++++++++}).Where(x+=>+x.containsIp+&&+x.containsPhysicalAddress)
++++++++.Select(m+=>+Regex.Match(m.content,+@"(?ix)++Physical+\s+address+[%5E:]%2B+:+\s*+(?<Mac>[%5E\s]%2B)").Groups["Mac"].Value).FirstOrDefault();

++++++++return+connection;
++++}|code-block|syntax|javascript|1345585|entityMap^0|1Z|12|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

let's say I have a TcpConnection using my local ip of 192.168.0.182. Then if I will like to know the mac address of that NIC I will call the meothod as: <code>GetMacAddressUsedByIp("192.168.0.182")</code>

<pre><code>public static string GetMacAddressUsedByIp(string ipAddress)
 {
 var ips = new List&lt;string&gt;();
 string output;

 try
 {
 // Start the child process.
 Process p = new Process();
 // Redirect the output stream of the child process.
 p.StartInfo.UseShellExecute = false;

 p.StartInfo.RedirectStandardOutput = true;
 p.StartInfo.UseShellExecute = false;
 p.StartInfo.CreateNoWindow = true;
 p.StartInfo.FileName = "ipconfig";
 p.StartInfo.Arguments = "/all";
 p.Start();
 // Do not wait for the child process to exit before
 // reading to the end of its redirected stream.
 // p.WaitForExit();
 // Read the output stream first and then wait.
 output = p.StandardOutput.ReadToEnd();
 p.WaitForExit();

 }
 catch
 {
 return null;
 }

 // pattern to get all connections
 var pattern = @"(?xis) 
(?&lt;Header&gt;
 (\r|\n) [^\r]+ : \r\n\r\n
)
(?&lt;content&gt;
 .+? (?= ( (\r\n\r\n)|($)) )
)";

 List&lt;Match&gt; matches = new List&lt;Match&gt;();

 foreach (Match m in Regex.Matches(output, pattern))
 matches.Add(m);

 var connection = matches.Select(m =&gt; new
 {
 containsIp = m.Value.Contains(ipAddress),
 containsPhysicalAddress = Regex.Match(m.Value, @"(?ix)Physical \s Address").Success,
 content = m.Value
 }).Where(x =&gt; x.containsIp &amp;&amp; x.containsPhysicalAddress)
 .Select(m =&gt; Regex.Match(m.content, @"(?ix) Physical \s address [^:]+ : \s* (?&lt;Mac&gt;[^\s]+)").Groups["Mac"].Value).FirstOrDefault();

 return connection;
 }
</code></pre>

blocks|key|1561180|text|public+static+PhysicalAddress+GetMacAddress()
{
++++var+myInterfaceAddress+=+NetworkInterface.GetAllNetworkInterfaces()
++++++++.Where(n+=>+n.OperationalStatus+==+OperationalStatus.Up+&&+n.NetworkInterfaceType+!=+NetworkInterfaceType.Loopback)
++++++++.OrderByDescending(n+=>+n.NetworkInterfaceType+==+NetworkInterfaceType.Ethernet)
++++++++.Select(n+=>+n.GetPhysicalAddress())
++++++++.FirstOrDefault();

++++return+myInterfaceAddress;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1561181|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public static PhysicalAddress GetMacAddress()
{
 var myInterfaceAddress = NetworkInterface.GetAllNetworkInterfaces()
 .Where(n =&gt; n.OperationalStatus == OperationalStatus.Up &amp;&amp; n.NetworkInterfaceType != NetworkInterfaceType.Loopback)
 .OrderByDescending(n =&gt; n.NetworkInterfaceType == NetworkInterfaceType.Ethernet)
 .Select(n =&gt; n.GetPhysicalAddress())
 .FirstOrDefault();

 return myInterfaceAddress;
}
</code></pre>

blocks|key|1345618|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1345619|++++///+<summary>
++++///+returns+the+first+MAC+address+from+where+is+executed+
++++///+</summary>
++++///+<param+name="flagUpOnly">if+sets+returns+only+the+nic+on+Up+status</param>
++++///+<returns></returns>
++++public+static+string[]+getOperationalMacAddresses(Boolean+flagUpOnly)
++++{
++++++++string[]+macAddresses+=+new+string[NetworkInterface.GetAllNetworkInterfaces().Count()];

++++++++int+i+=+0;
++++++++foreach+(NetworkInterface+nic+in+NetworkInterface.GetAllNetworkInterfaces())
++++++++{
++++++++++++if+(nic.OperationalStatus+==+OperationalStatus.Up+%7C%7C+!flagUpOnly)
++++++++++++{
++++++++++++++++macAddresses[i]+%2B=+ByteToHex(nic.GetPhysicalAddress().GetAddressBytes());
++++++++++++++++//break;
++++++++++++++++i%2B%2B;
++++++++++++}
++++++++}
++++++++return+macAddresses;
++++}|code-block|syntax|javascript|1345620|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this: 

<pre><code> /// &lt;summary&gt;
 /// returns the first MAC address from where is executed 
 /// &lt;/summary&gt;
 /// &lt;param name="flagUpOnly"&gt;if sets returns only the nic on Up status&lt;/param&gt;
 /// &lt;returns&gt;&lt;/returns&gt;
 public static string[] getOperationalMacAddresses(Boolean flagUpOnly)
 {
 string[] macAddresses = new string[NetworkInterface.GetAllNetworkInterfaces().Count()];

 int i = 0;
 foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
 {
 if (nic.OperationalStatus == OperationalStatus.Up || !flagUpOnly)
 {
 macAddresses[i] += ByteToHex(nic.GetPhysicalAddress().GetAddressBytes());
 //break;
 i++;
 }
 }
 return macAddresses;
 }
</code></pre>

blocks|key|1561273|text|我真的不想翻出这个老帖子，但我觉得这个问题应该有针对Windows8-10的另一个答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561274|使用Windows.Networking.Connectivity名称空间中的NetworkInformation，您可以获得windows正在使用的网络适配器的Id。然后，您可以从前面提到的GetAllNetworkInterfaces()获取接口的MAC地址。|offset|length|1561275|这在Windows+Store+Apps中不起作用，因为System.Net.NetworkInformation中的NetworkInterface不会公开GetAllNetworkInterfaces。|1561276|string+GetMacAddress()
{
++++var+connectionProfile+=+NetworkInformation.GetInternetConnectionProfile();
++++if+(connectionProfile+==+null)+return+"";

++++var+inUseId+=+connectionProfile.NetworkAdapter.NetworkAdapterId.ToString("B").ToUpperInvariant();
++++if(string.IsNullOrWhiteSpace(inUseId))+return+"";

++++var+mac+=+NetworkInterface.GetAllNetworkInterfaces()
++++++++.Where(n+=>+inUseId+==+n.Id)
++++++++.Select(n+=>+n.GetPhysicalAddress().GetAddressBytes().Select(b=>b.ToString("X2")))
++++++++.Select(macBytes+=>+string.Join("+",+macBytes))
++++++++.FirstOrDefault();

++++return+mac;
}|code-block|syntax|javascript|1561277|entityMap|0|LINK|mutability|MUTABLE|url|https://msdn.microsoft.com/library/windows/apps/br207308|1|https://msdn.microsoft.com/en-us/library/windows/apps/windows.networking.connectivity.networkinformation|2|https://msdn.microsoft.com/en-us/library/windows/apps/system.net.networkinformation.networkinterface(v=vs.105).aspx^0|0|2|V|0|13|I|1|0|1N|G|2|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]|$D|13|E|14|1|15]]|A|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@$D|17|E|18|1|19]]|A|$]]|$1|H|3|I|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]|U|$5|P|Q|R|A|$S|V]]|W|$5|P|Q|R|A|$S|X]]]]

Really hate to dig up this old post but I feel the question deserves another answer specific to windows 8-10. 

Using <a href="https://msdn.microsoft.com/en-us/library/windows/apps/windows.networking.connectivity.networkinformation" rel="nofollow">NetworkInformation</a> from the <a href="https://msdn.microsoft.com/library/windows/apps/br207308" rel="nofollow">Windows.Networking.Connectivity</a> namespace, you can get the Id of the network adapter windows is using. Then you can get the interface MAC Address from the previously mentioned GetAllNetworkInterfaces().

This will not work in Windows Store Apps as <a href="https://msdn.microsoft.com/en-us/library/windows/apps/system.net.networkinformation.networkinterface(v=vs.105).aspx" rel="nofollow">NetworkInterface</a> in System.Net.NetworkInformation does not expose GetAllNetworkInterfaces.

<pre><code>string GetMacAddress()
{
 var connectionProfile = NetworkInformation.GetInternetConnectionProfile();
 if (connectionProfile == null) return "";

 var inUseId = connectionProfile.NetworkAdapter.NetworkAdapterId.ToString("B").ToUpperInvariant();
 if(string.IsNullOrWhiteSpace(inUseId)) return "";

 var mac = NetworkInterface.GetAllNetworkInterfaces()
 .Where(n =&gt; inUseId == n.Id)
 .Select(n =&gt; n.GetPhysicalAddress().GetAddressBytes().Select(b=&gt;b.ToString("X2")))
 .Select(macBytes =&gt; string.Join(" ", macBytes))
 .FirstOrDefault();

 return mac;
}
</code></pre>

blocks|key|1561333|text|修改了blak3r的代码。以防您有两个速度相同的适配器。按MAC排序，因此您总是得到相同的值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1561334|public+string+GetMacAddress()
{
++++const+int+MIN_MAC_ADDR_LENGTH+=+12;
++++string+macAddress+=+string.Empty;
++++Dictionary<string,+long>+macPlusSpeed+=+new+Dictionary<string,+long>();
++++try
++++{
++++++++foreach(NetworkInterface+nic+in+NetworkInterface.GetAllNetworkInterfaces())
++++++++{
++++++++++++System.Diagnostics.Debug.WriteLine("Found+MAC+Address:+"+%2B+nic.GetPhysicalAddress()+%2B+"+Type:+"+%2B+nic.NetworkInterfaceType);

++++++++++++string+tempMac+=+nic.GetPhysicalAddress().ToString();

++++++++++++if(!string.IsNullOrEmpty(tempMac)+&&+tempMac.Length+>=+MIN_MAC_ADDR_LENGTH)
++++++++++++++++macPlusSpeed.Add(tempMac,+nic.Speed);
++++++++}

++++++++macAddress+=+macPlusSpeed.OrderByDescending(row+=>+row.Value).ThenBy(row+=>+row.Key).FirstOrDefault().Key;
++++}
++++catch{}

++++System.Diagnostics.Debug.WriteLine("Fastest+MAC+address:+"+%2B+macAddress);

++++return+macAddress;
}|code-block|syntax|javascript|1561335|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Changed blak3r his code a bit. In case you have two adapters with the same speed. Sort by MAC, so you always get the same value.

<pre><code>public string GetMacAddress()
{
 const int MIN_MAC_ADDR_LENGTH = 12;
 string macAddress = string.Empty;
 Dictionary&lt;string, long&gt; macPlusSpeed = new Dictionary&lt;string, long&gt;();
 try
 {
 foreach(NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
 {
 System.Diagnostics.Debug.WriteLine("Found MAC Address: " + nic.GetPhysicalAddress() + " Type: " + nic.NetworkInterfaceType);

 string tempMac = nic.GetPhysicalAddress().ToString();

 if(!string.IsNullOrEmpty(tempMac) &amp;&amp; tempMac.Length &gt;= MIN_MAC_ADDR_LENGTH)
 macPlusSpeed.Add(tempMac, nic.Speed);
 }

 macAddress = macPlusSpeed.OrderByDescending(row =&gt; row.Value).ThenBy(row =&gt; row.Key).FirstOrDefault().Key;
 }
 catch{}

 System.Diagnostics.Debug.WriteLine("Fastest MAC address: " + macAddress);

 return macAddress;
}
</code></pre>

blocks|key|1345766|text|string+mac+=+"";
foreach+(NetworkInterface+nic+in+NetworkInterface.GetAllNetworkInterfaces())
++++++++++++{

++++++++++++++++if+(nic.OperationalStatus+==+OperationalStatus.Up+&&+(!nic.Description.Contains("Virtual")+&&+!nic.Description.Contains("Pseudo")))
++++++++++++++++{
++++++++++++++++++++if+(nic.GetPhysicalAddress().ToString()+!=+"")
++++++++++++++++++++{
++++++++++++++++++++++++mac+=+nic.GetPhysicalAddress().ToString();
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
MessageBox.Show(mac);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1345767|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>string mac = "";
foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
 {

 if (nic.OperationalStatus == OperationalStatus.Up &amp;&amp; (!nic.Description.Contains("Virtual") &amp;&amp; !nic.Description.Contains("Pseudo")))
 {
 if (nic.GetPhysicalAddress().ToString() != "")
 {
 mac = nic.GetPhysicalAddress().ToString();
 }
 }
 }
MessageBox.Show(mac);
</code></pre>

blocks|key|1345819|text|IMHO返回第一个mac地址不是一个好主意，尤其是在托管虚拟机的情况下。因此，我检查了发送/接收字节总数并选择了最常用的连接，这并不完美，但应该是正确的9/10次。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1345820|public+string+GetDefaultMacAddress()
{
++++Dictionary<string,+long>+macAddresses+=+new+Dictionary<string,+long>();
++++foreach+(NetworkInterface+nic+in+NetworkInterface.GetAllNetworkInterfaces())
++++{
++++++++if+(nic.OperationalStatus+==+OperationalStatus.Up)
++++++++++++macAddresses[nic.GetPhysicalAddress().ToString()]+=+nic.GetIPStatistics().BytesSent+%2B+nic.GetIPStatistics().BytesReceived;
++++}
++++long+maxValue+=+0;
++++string+mac+=+"";
++++foreach(KeyValuePair<string,+long>+pair+in+macAddresses)
++++{
++++++++if+(pair.Value+>+maxValue)
++++++++{
++++++++++++mac+=+pair.Key;
++++++++++++maxValue+=+pair.Value;
++++++++}
++++}
++++return+mac;
}|code-block|syntax|javascript|1345821|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

IMHO returning first mac address isn't good idea, especially when virtual machines are hosted. Therefore i check send/received bytes sum and select most used connection, that is not perfect, but should be correct 9/10 times.

<pre><code>public string GetDefaultMacAddress()
{
 Dictionary&lt;string, long&gt; macAddresses = new Dictionary&lt;string, long&gt;();
 foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
 {
 if (nic.OperationalStatus == OperationalStatus.Up)
 macAddresses[nic.GetPhysicalAddress().ToString()] = nic.GetIPStatistics().BytesSent + nic.GetIPStatistics().BytesReceived;
 }
 long maxValue = 0;
 string mac = "";
 foreach(KeyValuePair&lt;string, long&gt; pair in macAddresses)
 {
 if (pair.Value &gt; maxValue)
 {
 mac = pair.Key;
 maxValue = pair.Value;
 }
 }
 return mac;
}
</code></pre>

blocks|key|1345837|text|foreach+(NetworkInterface+nic+in+NetworkInterface.GetAllNetworkInterfaces())
{
+++++if+(nic.OperationalStatus+==+OperationalStatus.Up)
+++++{
++++++++++++PhysicalAddress+Mac+=+nic.GetPhysicalAddress();
+++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1345838|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
{
 if (nic.OperationalStatus == OperationalStatus.Up)
 {
 PhysicalAddress Mac = nic.GetPhysicalAddress();
 }
}
</code></pre>

I need a way to get a machine's MAC address, regardless of the OS it is running, by using C#.
The application will need to work on XP/Vista/Win7 32bit and 64bit, as well as on those OSs but with a foreign language default. Also, many of the C# commands and OS queries don't work across all the OSs.
Do you have any ideas?
I have been scraping the output of <code>ipconfig /all</code> but this is terribly unreliable as the output format differs on every machine.

Reliable method to get machine's MAC address in C#

虚拟机

Windows

我需要一种方法来获得机器的MAC地址，而不管它运行的是什么操作系统，通过使用C#。该应用程序将需要在XP/Vista/Win7 32位和64位，以及这些操作系统上，但与外语默认。此外，许多C#命令和操作系统查询并不能在所有操作系统上运行。你有什么想法吗？我一直在抓取ipconfig /all的输出，但这是非常不可靠的，...

问在C#中获取机器MAC地址的可靠方法
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