How to Perform a Synchronous Query by Using System.Management

Artikel
10/10/2022

To synchronously query the Configuration Manager client Windows Management Instrumentation (WMI), you use a ManagementObjectSearcher object.

To read a lazy property from a Configuration Manager object that is returned in a query, you get the object instance, which in turn retrieves any lazy object properties from the SMS Provider.

To perform a synchronous query

Set up a connection to the Configuration Manager client WMI namespace. For more information, see How to Connect to the Configuration Manager Client WMI Namespace by Using System.Management.
Create a ManagementObjectSearcher collection, and specify a WQL query.
Iterate through the ManagementObjectSearcher collection to view the ManagementObject for each WMI object that is returned by the query.

Example

The following C# code example queries for the single SMS_Client object that is on a Configuration Manager client.

For information about calling the sample code, see How to Call a WMI Class Method by Using System.Management.


public void QueryObjects(ManagementScope scope)  
{  
    try  
    {  
        ManagementObjectSearcher s = new ManagementObjectSearcher  
            ((scope), new WqlObjectQuery("SELECT * FROM sms_client"));  

        foreach (ManagementObject o in s.Get())  
        {  
            // There is only one instance of SMS_Client, so this should enumerate only once.  
            Console.WriteLine("Client version: " + o["ClientVersion"].ToString());  
        }  
    }  
    catch (System.Management.ManagementException e)  
    {  
        Console.WriteLine("Failed to make query: ", e.Message);  
        throw;  
    }  
}

This example method has the following parameters:

Parameter	Type	Description
`scope`	`ManagementScope`	Represents a scope (namespace) for management operations.

Compiling the Code

Namespaces

System.

System.Management.

Assembly

System.Management.

Robust Programming

The exception that can be raised is System.Management.ManagementException.

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