How do you modify a custom SCCM SMS_TaskSequence_Action property in C#?

Question

I am trying to update SCCM SMS_TaskSequence_Action classes in WMI using C#. I can successfully enumerate SMS_TaskSequence_Step classes completely; but I cannot seem to modify and/or "update" WMI the way I'd expect.

I am using a .NET 4.7.2 Console application, including references to the AMD64-specific "adminui.wqlqueryengine.dll" and "microsoft.configurationmanagement.managementprovider.dll" libraries.

I expected that I could use IResultObject.Get() and .Put(), but they're throwing "System.NotImplementedException". I can use SetArrayItems() on the ts (Task Sequence) object, but the changes don't appear to be applying.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.ConfigurationManagement.ManagementProvider;
using Microsoft.ConfigurationManagement.ManagementProvider.WqlQueryEngine;

namespace SCCM
{
    class Program
    {
        static Microsoft.ConfigurationManagement.ManagementProvider.WqlQueryEngine.WqlConnectionManager wqlcm;

        static void Main(string[] args)
        {
            wqlcm = new WqlConnectionManager();
            wqlcm.Connect("ServerName");

            IResultObject taskSequencePackages = wqlcm.QueryProcessor.ExecuteQuery("select * from SMS_TaskSequencePackage");

            foreach (IResultObject tsp in taskSequencePackages)
            {
                tsp.Get();
                //tsp["Name"].StringValue = "Setting a custom Task Sequence Package Name";
                //tsp.Put();

                Console.WriteLine("Task Sequence Name: " + tsp["Name"].StringValue);
                Console.WriteLine("Sequence: " + tsp["Sequence"].StringValue);

                Dictionary<string, object> parameters = new Dictionary<string, object>();
                parameters.Add("TaskSequencePackage", tsp);

                IResultObject sequence = wqlcm.ExecuteMethod("SMS_TaskSequencePackage", "GetSequence", parameters);
                IResultObject ts = sequence.GetSingleItem("TaskSequence");

                // Get a list of steps.  
                List<IResultObject> actionSteps = ts.GetArrayItems("Steps");

                // Find the action to be deleted.  
                foreach (IResultObject actionStep in actionSteps)
                {
                    if (actionStep["__CLASS"].StringValue == "MyCustomTaskSequenceAction" && actionStep["__SUPERCLASS"].StringValue == "SMS_TaskSequence_Action")
                    {
                        // Throws a "System.NotImplementedException": The method or operation is not implemented.  
                        //actionStep.Get();

                        actionStep["CommandLine"].StringValue = "Some New Command Line";

                        ts.SetArrayItems("Steps", actionSteps);
                        break;
                    }
                }
            }
        }
    }
}

I am also aware that an SMS_TaskSequencePackage class contains a single SMS_TaskSequence, and from it, I can retrieve the SMS_TaskSequence_Step classes that make up a Task Sequence. I also know that I'll need to enumerate the steps recursively (following the SDK) because a Step can be an SMS_TaskSequence_Action or any number of nested SMS_TaskSequence_Group objects.

Assuming I recurse through all of the steps, how does one make changes to the specific SMS_TaskSequence_Action classes they want to change and apply them properly? Using .Get() and .Put() works on the tsp object, but I can't seem to figure out how to update steps.

Syberdoor · Accepted Answer · 2019-06-29T18:45:50.203

I think what you are missing is a call to SetSequence after the SetArrayItems so you just finalized the steps but did not save the new steps to the ts, so you would need something like:

Dictionary<string, object> inParams = new Dictionary<string, object>();  
inParams.Add("TaskSequence", ts);  
inParams.Add("TaskSequencePackage", tsp);  

// Associate the task sequence with the package. Note that a call to Put is not required.  
IResultObject result = connection.ExecuteMethod("SMS_TaskSequencePackage", "SetSequence", inParams);

I could not find a good example for your use case in english and c# but this german powershell tutorial (code is commented in english, saving is done in 5th step) leads me to believe it has to be done this way.

How do you modify a custom SCCM SMS_TaskSequence_Action property in C#?

1 Answers1