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；

C#获得本机MAC地址 - [Coding](转)

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;
  }