How to Call a WMI Class Method by Using System.Management

Artikel
10/10/2022

To call a client Windows Management Instrumentation (WMI) class method, in Configuration Manager, you call the InvokeMethod of the WMI class's ManagementClass.

To call a WMI class method

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 ManagementClass by using the ManagementScope path you obtain in step one, and also the name of the class you want to call a method on.
Create a ManagementBaseObject and specify any in parameters for the method.
Call the method by using the ManagementClass object InvokeMethod method.
Using the returned ManagementBaseObject, view the returned parameters.

Example

The following C# code example calls the ISmsClient::GetAssignedSite method to get the current assigned site for the client. It then sets the assigned site back to the same value using the ISmsClient::SetAssignedSite method.

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


public void CallMethod(ManagementScope scope)  
{  
    try// Get the client's SMS_Client class.  
    {  
        ManagementClass cls = new ManagementClass(scope.Path.Path, "sms_client", null);  

        // Get current site code.  
        ManagementBaseObject outSiteParams = cls.InvokeMethod("GetAssignedSite", null, null);  

        // Display current site code.  
        Console.WriteLine(outSiteParams["sSiteCode"].ToString());  

        // Set up current site code as input parameter for SetAssignedSite.  
        ManagementBaseObject inParams = cls.GetMethodParameters("SetAssignedSite");  
        inParams["sSiteCode"] = outSiteParams["sSiteCode"].ToString();  

        // Assign the Site code.  
        ManagementBaseObject outMPParams = cls.InvokeMethod("SetAssignedSite", inParams, null);  
    }  
    catch (ManagementException e)  
    {  
        throw new Exception("Failed to execute method", e);  
    }  
}

This example method has the following parameters:

Parameter	Type	Description
`scope`	- `ManagementScope`	A valid connection to the client WMI provider. The path is root\ccm.

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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