Question

I’m building what could be called the DAL for a new app. Unfortunately, network connectivity to the database is a real problem.

I’d like to be able to temporarily block network access within the scope of my test so that I can ensure my DAL behaves as expected under those circumstances.

UPDATE: There are many manual ways to disable the network, but it sure would be nice if I could enable/disable within the test itself.

Answer 1

For the time being, I’m just ‘disabling’ the network by setting a bogus static IP as follows:

using System.Management;  class NetworkController {      public static void Disable()     {         SetIP('192.168.0.4', '255.255.255.0');     }      public static void Enable()     {         SetDHCP();     }       private static void SetIP(string ip_address, string subnet_mask)     {         ManagementClass objMC = new ManagementClass('Win32_NetworkAdapterConfiguration');         ManagementObjectCollection objMOC = objMC.GetInstances();          foreach (ManagementObject objMO in objMOC) {             if ((bool)objMO('IPEnabled')) {                 try {                     ManagementBaseObject setIP = default(ManagementBaseObject);                     ManagementBaseObject newIP = objMO.GetMethodParameters('EnableStatic');                      newIP('IPAddress') = new string[] { ip_address };                     newIP('SubnetMask') = new string[] { subnet_mask };                      setIP = objMO.InvokeMethod('EnableStatic', newIP, null);                 }                 catch (Exception generatedExceptionName) {                     throw;                 }             }           }     }      private static void SetDHCP()     {         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 ((bool)mo('IPEnabled')) {                 ManagementBaseObject newDNS = mo.GetMethodParameters('SetDNSServerSearchOrder');                 newDNS('DNSServerSearchOrder') = null;                 ManagementBaseObject enableDHCP = mo.InvokeMethod('EnableDHCP', null, null);                 ManagementBaseObject setDNS = mo.InvokeMethod('SetDNSServerSearchOrder', newDNS, null);             }         }     } }