在C＃中更改IP地址

Question

I have ac# program that needs to connect to another computer via a UDP connection. In order to perform this operation, I need to temporarily change the IP address of my network card on my computer, so they can talk to one another. I can do this just fine. However, when I'm done, I want to restore my IP address back to what it was before; which is to automatically obtain an IP address.

Can someone tell me how to change my settings back to what they were previously?

Thanks,

Phil

Answer 1

You may want to check this SwitchNetConfig project.

The part that interest you is how to change the IP:

public static void SetIP( string nicName, string IpAddresses, 
  string SubnetMask, string Gateway, string DnsSearchOrder)
{
  ManagementClass mc = new ManagementClass(
    "Win32_NetworkAdapterConfiguration");
  ManagementObjectCollection moc = mc.GetInstances();

  foreach(ManagementObject mo in moc)
  {
    // Make sure this is a IP enabled device. 

    // Not something like memory card or VM Ware

    if( mo["IPEnabled"] as bool )
    {
      if( mo["Caption"].Equals( nicName ) )
      {

        ManagementBaseObject newIP = 
          mo.GetMethodParameters( "EnableStatic" );
        ManagementBaseObject newGate = 
          mo.GetMethodParameters( "SetGateways" );
        ManagementBaseObject newDNS = 
          mo.GetMethodParameters( "SetDNSServerSearchOrder" );

        newGate[ "DefaultIPGateway" ] = new string[] { Gateway };
        newGate[ "GatewayCostMetric" ] = new int[] { 1 };

        newIP[ "IPAddress" ] = IpAddresses.Split( ',' );
        newIP[ "SubnetMask" ] = new string[] { SubnetMask };

        newDNS[ "DNSServerSearchOrder" ] = DnsSearchOrder.Split(',');

        ManagementBaseObject setIP = mo.InvokeMethod( 
          "EnableStatic", newIP, null);
        ManagementBaseObject setGateways = mo.InvokeMethod( 
          "SetGateways", newGate, null);
        ManagementBaseObject setDNS = mo.InvokeMethod( 
          "SetDNSServerSearchOrder", newDNS, null);

        break;
      }
    }
  }
}