C# .NET - WMI query hangs on ManagementObjectCollection

Hello,

I have an app that loops through a list of machines and queries their WMI database.

On some machines, WMI is not working correctly and as such my app "hangs" forever on the following line:

        System.Management.ManagementObjectCollection oReturnCollection = oSearcher.Get();

How can I by-pass this if it fails?  I'm using a "try" but it doesn't throw an exception when it hits this line and hangs.

At this point I don't care that WMI is not working, I just want my app to throw an exception via "catch" and continue to the next machine.

Thanks!

Clark Bohs

"Timeout-able":

http://www.eggheadcafe.com/tutorials/aspnet/847c94bf-4b8d-4a66-9ae5-5b61f049019f/basics-make-any-method-c.aspx

public static string GetDriveSerialNO(string logicaldriveName)
        {
            if (string.IsNullOrEmpty(logicaldriveName))
            {
                logicaldriveName = "C";
            }
            // create management object to invoke the WMI query to access the drive.
            try
            {
                ManagementObject hdDisk = new ManagementObject("Win32_LogicalDisk.DeviceID=\"" + logicaldriveName + ":\"");
                hdDisk.Get();
                // read the volume serial no value using key from the collections
                string serialNo = hdDisk["VolumeSerialNumber"].ToString();
                // fianlly dispose the management object.
                hdDisk.Dispose();
                return serialNo;
            }
            catch (System.Management.ManagementException mex)
            {             
                
                throw mex;
            }
        }

Here my article http://www.codegain.com/index.php?option=com_sectionex&view=category&id=5&Itemid=18#catid167

Thank you
http://www.codegain.com

Thanks Peter!  I'll try it out and post the results.

Clark Bohs

Thanks for your response Bill, but unfortunately it doesn't match what I'm asking.

If "try catch" worked then I wouldn't have posted my question in the first place.

Below is my original question...

I have an app that loops through a list of machines and queries their WMI database.

On some machines, WMI is not working correctly and as such my app "hangs" forever on the following line:

        System.Management.ManagementObjectCollection oReturnCollection = oSearcher.Get();

How can I by-pass this if it fails?  I'm using a "try" but it doesn't throw an exception when it hits this line and hangs.

At this point I don't care that WMI is not working, I just want my app to throw an exception via "catch" and continue to the next machine.

Hello again Peter,

I took a look at your timeout code and I'm having some difficulty porting the functionality to my application.

Can you help me integrate your code with the code below?  Thanks!

System.Management.ManagementObjectCollection oReturnCollection = oSearcher.Get();

}

catch

{

}

I answered my own question.  I created a new thread and started a method within the new thread and set a time-out on the join.

See code below.  It captures the machine name where it timed out and then continues on with the processing of the main thread.  I didn't include the method since any method can be plugged in, along with the appropriate method parameters.

Yes, I answered my own question and posted it.  You replied to the solution I posted.

Here it is again....


I answered my own question.  I created a new thread and started a method within the new thread and set a time-out on the join.

See code below.  It captures the machine name where it timed out and then continues on with the processing of the main thread.  I didn't include the method since any method can be plugged in, along with the appropriate method parameters.