C#获取mac

验证计算机MAC地址进行软件授权是一种通用的方法，C#可以轻松获取计算机的MAC地址，本文采用实际的源代码讲述了两种获取网卡的方式，第一种 方法使用ManagementClass类，只能获取本机的计算机网卡物理地址，第二种方法使用Iphlpapi.dll的SendARP方法，可以获取 本机和其它计算机的MAC地址。

方法1：使用ManagementClass类

示例：

/// <summary>         /// 获取网卡物理地址         /// </summary>         /// <returns></returns>         public static string getMacAddr_Local()         {             string madAddr = null;             ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");             ManagementObjectCollection moc2 = mc.GetInstances();             foreach (ManagementObject mo in moc2)             {                 if (Convert.ToBoolean(mo["IPEnabled"]) == true)                 {                     madAddr = mo["MacAddress"].ToString();                     madAddr = madAddr.Replace(':', '-');                 }                 mo.Dispose();             }             return madAddr;         }

说明：

1.需要给项目增加引用：System.Management

    2.在程序开始添加包引入语句：using System.Management；

    3.本方案只能获取本机的MAC地址；

方法2：使用SendARP类

示例：

//下面一种方法可以获取远程的MAC地址         [DllImport("Iphlpapi.dll")]         static extern int SendARP(Int32 DestIP, Int32 SrcIP, ref Int64 MacAddr, ref Int32 PhyAddrLen);         [DllImport("Ws2_32.dll")]         static extern Int32 inet_addr(string ipaddr);                 /// <summary>         /// SendArp获取MAC地址         /// </summary>         /// <param name="RemoteIP">目标机器的IP地址如(192.168.1.1)</param>         /// <returns>目标机器的mac 地址</returns>         public static string getMacAddr_Remote(string RemoteIP)         {             StringBuilder macAddress = new StringBuilder();             try             {                 Int32 remote = inet_addr(RemoteIP);                 Int64 macInfo = new Int64();                 Int32 length = 6;                 SendARP(remote, 0, ref macInfo, ref length);                 string temp = Convert.ToString(macInfo, 16).PadLeft(12, '0').ToUpper();                 int x = 12;                 for (int i = 0; i < 6; i++)                 {                     if (i == 5)                     {                         macAddress.Append(temp.Substring(x - 2, 2));                     }                     else                     {                         macAddress.Append(temp.Substring(x - 2, 2) + "-");                     }                     x -= 2;                 }                 return macAddress.ToString();             }             catch             {                 return macAddress.ToString();             }         }

说明：

1.在程序开始添加包引入语句：using System.Runtime.InteropServices;

2.该方法可以获取远程计算机的MAC地址；

 ​

刚开始在机房推广我们组的系统，用户注册就失效了，debug了许久之后，发现居然是一直都在使用的获得MAC的地址的方法居然失效了——数据库报异常，以MAC为主键的表提示主键重复了 ，怎么可能啊？就好像GUID重复一样！！！！

对原来获得MAC的地址的代码做了测试，才发现在我机子居然运行的结果和在cmd下ipconfig的结果不同 ，仅是一个vm的mac。源码如下：

string MacAddress; //设置MAC地址 string MAC="";  ManagementClass MC = new ManagementClass ( "Win32_NetworkAdapterConfiguration" );  ManagementObjectCollection MOC = MC.GetInstances();  foreach ( ManagementObject moc in MOC )  {   if ( moc["IPEnabled"].ToString() == "True")   {    MAC = moc["MacAddress"].ToString();   } } MacAddress=MAC;

经过在网络上寻找，找到了获得本机mac的方法，只是结果是一个ArrayList，运行的结果和cmd下命令一样，只是包括了一个真的mac和两个vm的mac，源码如下：

using System.Management; using System.Runtime.InteropServices;  using System.Text;   using System.Text.RegularExpressions;  string strsearch=string.Format(@"SELECT MACAddress FROM Win32_NetworkAdapter WHERE ((MACAddress Is Not NULL)AND (Manufacturer <> 'Microsoft'))");  System.Management.ManagementObjectSearcher msearch=new ManagementObjectSearcher();   msearch.Scope=new ManagementScope(@"root/CIMV2");  msearch.Query=new ObjectQuery(strsearch);  ArrayList MacList  =new ArrayList(); int i =0; try  {   if((msearch.Get().Count<1) || (msearch.Get()==null))   {    MessageBox.Show("No MAC Address!");   }   else   {    MessageBox.Show("MAC Address No. is : "+ msearch.Get().Count.ToString());    foreach(System.Management.ManagementObject mymac in msearch.Get())    {     string str1=string.Format("MAC{0} address:{1}",i.ToString(),mymac["MACAddress"].ToString());     MessageBox.Show("MAC Address "+i.ToString()+":"+str1);     MacList.Add(str1);    i++;    }   }  }  catch(Exception ex)  {   string msg=ex.Message.ToString();   MessageBox.Show("erro", msg);  }

由于没有办法确定获得mac那个真实的，所以又用了第三个方法，通过IP地址获得mac：

using System.Management; using System.Runtime.InteropServices;  using System.Text;   using System.Text.RegularExpressions;   [DllImport("Iphlpapi.dll")]    private static extern int SendARP(Int32 dest,Int32 host,ref Int32 mac,ref Int32 length);    [DllImport("Ws2_32.dll")]    private static extern Int32 inet_addr(string ip);    string IPAddress=System.Net.Dns.GetHostByName(System.Net.Dns.GetHostName()).AddressList[0].ToString(); MessageBox.Show("ip: "+IPAddress); string mac = this.GetMACFromIP(IPAddress); MessageBox.Show("mac: "+mac);  private   string   GetMACFromIP(string   A_strIP)      {       string   strRet   =   "Unknown";            string   strIPPattern   =   @"^/d+/./d+/./d+/./d+$";            Regex   objRex   =new   Regex(strIPPattern);            if(objRex.IsMatch(A_strIP)   ==   true)       {        Int32   intDest   =   inet_addr(A_strIP);        Int32   []   arrMAC   =   new   Int32[2];        Int32   intLen   =   6;             int   intResult   =   SendARP(intDest,0,ref   arrMAC[0],ref   intLen);             if(intResult   ==   0)        {         Byte   []   arrbyte   =   new   Byte[8];         arrbyte[5]   =   (Byte)(arrMAC[1]   >>   8);         arrbyte[4]   =   (Byte)arrMAC[1];         arrbyte[3]   =   (Byte)(arrMAC[0]   >>   24);         arrbyte[2]   =   (Byte)(arrMAC[0]   >>   16);         arrbyte[1]   =   (Byte)(arrMAC[0]   >>   8);         arrbyte[0]   =   (Byte)arrMAC[0];              StringBuilder   strbMAC   =   new   StringBuilder();              for(int   intIndex   =   0   ;intIndex   <   6;intIndex   ++)         {          if(intIndex   >   0)   strbMAC.Append("-");          strbMAC.Append(arrbyte[intIndex].ToString("X2"));         }         strRet   =   strbMAC.ToString();        }       }       return   strRet;      }