Configuring TCP/IP Settings using WMI and C#

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Introduction

This article demonstrates the power of WMI, on how to configure TCP/IP Setting programmatically using C#. This article is targeted at intermediate developers.

Using the code

WMI Extends the possibilities of .NET and simplifies the life while working on NetworkAdapters. The Following Code snippet lists all the Network adapters along with the IP Address, Subnet Mask, Default Gateway

public void ListIP() 
{
 ManagementClass objMC = new ManagementClass(
    "Win32_NetworkAdapterConfiguration"); 
 ManagementObjectCollection objMOC = objMC.GetInstances(); 
 
foreach(ManagementObject objMO in objMOC) 
{ 
          if(!(bool)objMO["ipEnabled"]) 
                 continue; 


        
          Console.WriteLine(objMO["Caption"] + "," + 
            objMO["ServiceName"] + "," + objMO["MACAddress"]) ; 
          string[] ipaddresses = (string[]) objMO["IPAddress"]; 
          string[] subnets = (string[]) objMO["IPSubnet"]; 
          string[] gateways = (string[]) objMO["DefaultIPGateway"]; 

   
          Console.WriteLine("Printing Default Gateway Info:"); 
          Console.WriteLine(objMO["DefaultIPGateway"].ToString()); 
          
          Console.WriteLine("Printing IPGateway Info:"); 
          foreach(string sGate in gateways) 
               Console.WriteLine (sGate); 

 
          Console.WriteLine("Printing Ipaddress Info:"); 

          foreach(string sIP in ipaddresses) 
               Console.WriteLine(sIP); 
 
          Console.WriteLine("Printing SubNet Info:"); 

          foreach(string sNet in subnets) 
               Console.WriteLine(sNet);
}

Now, here is the code to configure TCP/IP Settings using WMI.

public void setIP(string IPAddress,string SubnetMask, string Gateway) 
{ 
 
ManagementClass objMC = new ManagementClass(
    "Win32_NetworkAdapterConfiguration"); 
ManagementObjectCollection objMOC = objMC.GetInstances(); 

 
foreach(ManagementObject objMO in objMOC) 
{ 

      if (!(bool) objMO["IPEnabled"]) 
           continue; 


 
      try 
        { 
          ManagementBaseObject objNewIP = null; 
          ManagementBaseObject objSetIP = null; 
          ManagementBaseObject objNewGate = null; 

          
          objNewIP = objMO.GetMethodParameters("EnableStatic"); 
          objNewGate = objMO.GetMethodParameters("SetGateways"); 
          


          //Set DefaultGateway
          objNewGate["DefaultIPGateway"] = new string[] {Gateway}; 
          objNewGate["GatewayCostMetric"] = new int[] {1}; 
          

          //Set IPAddress and Subnet Mask
          objNewIP["IPAddress"] = new string[] {IPAddress}; 
          objNewIP["SubnetMask"] = new string[] {SubnetMask}; 
          
          objSetIP = objMO.InvokeMethod("EnableStatic",objNewIP,null); 
          objSetIP = objMO.InvokeMethod("SetGateways",objNewGate,null); 


          
          Console.WriteLine(
             "Updated IPAddress, SubnetMask and Default Gateway!"); 


        
        } 
        catch(Exception ex) 
        { 
              MessageBox.Show("Unable to Set IP : " + ex.Message); } 
        }

There are some interesting methods in the Win32_NetworkAdapterConfiguration WMI Class, which represents the behaviour and attributes of a NetworkAdapter, explore them at http://msdn.microsoft.com/library/en-us/wmisdk/wmi/