Asp.net 无网络情况下 MaC 地址异常的问题

原始程序代码

/// <summary>
        /// 本地的Mac地址
        /// </summary>
        public static string LocalMacIP
        {
            get
            {
                ManagementClass mc;
                ManagementObjectCollection moc;
                mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
                moc = mc.GetInstances();
                string str = "";
                foreach (ManagementObject mo in moc)
                {
                    if ((bool)mo["IPEnabled"] == true)
                        str = mo["MacAddress"].ToString();

                }
                //return str;
                return "00:19:7E:CC:ED:B5";
            }

        }

结果和在cmd下ipconfig的结果不同，仅是一个vm的mac

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;

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); 
} 

 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

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;   
  }

正常..