How to hook according WMI function in fastprox.dll?

Question

Below is a block of C# code , I want to hook (ms-detours) the enumerating part:

var wql=new WqlObjectQuery(queryString);
using(var searcher =new ManagementObjectSearcher(scope,wql))
{
  using(var records=searcher.Get())
  {
   **foreach(var record in records)** //This is where I want to hook
   {
   //do something
   }
  }
}

I don't know which function in fastprox.dll is the one to hook. I've tried ?Get@CWbemObject@@UEAAJPEBGJPEAUtagVARIANT@@PEAJ2@Z , it could be hooked ,while it is not the one to enumerate ojbect. Could anyone help ?