SelectQuery占用了100％的CPU

Question

I am doing a query for all the users on the machine and when it executes it grabs 100% CPU and locks up the system. I have waited up to 5 minutes and nothing happens.

In the Task Manager wmiprvse.exe is using all the CPU. When I kill that process everything returns to normal.

Here is my code:

        SelectQuery query = new SelectQuery("Win32_UserAccount", 
            "LocalAccount=1 and Domain='" + GetMachine().DomainName + "'");
        using(ManagementObjectSearcher searcher = new ManagementObjectSearcher(query)) {
            IList<WindowsUser> users = new List<WindowsUser>();
            Console.WriteLine("Getting users...");
            foreach (ManagementObject envVar in searcher.Get()) {
                Console.WriteLine("Getting " + envVar["Name"].ToString() + "...");
            }
        }

In the console all I see is Getting users... and nothing else. The problem appears to be with searcher.Get().

Does anyone know why this query is taking 100% CPU? Thanks.

EDIT: OK I found that it the WMI process is only eating 25% CPU but it doesn't get released if I end the program (the query never finishes). The next time I start an instance the process goes up to 50% CPU, etc, etc until it is at 100%.

So my new question is why is the CPU not getting released and how long should a query like this take to complete?

Answer 1

Try this

SelectQuery query = new SelectQuery("Win32_UserAccount",  "LocalAccount=1 and Domain='" + GetMachine().DomainName + "'"); 
using(ManagementObjectSearcher searcher = new ManagementObjectSearcher(query)) { 
  IList<WindowsUser> users = new List<WindowsUser>(); 
  Console.WriteLine("Getting users...");
  ManagementObjectCollection myCollection = searcher.Get();
  foreach (ManagementObject envVar in MyCollection){ 
    Console.WriteLine("Getting " + envVar["Name"].ToString() + "..."); 
  } 
}