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Help finding a task's parent from the regarding field to recalculate roll-up

Hi I am trying to write a plugin that will auto-recalculate a custom entity's roll-up field every time a task's status is updated.


I have been following a tutorial where both entities are custom entities, but I think it works differently for a task.

When I change the code to try and refer to a task, I think I am either using the wrong field/ID to try and tell the plugin which parent record to run the recalculation on, or I need a different approach due to the child entity being a task and it having to use the 'regarding' / regardingobjectid

In a different tutorial, I have seen a plugin involving tasks, and they used: 


if (context.OutputParameters.Contains("id"))
                   Guid regardingobjectid = new Guid(context.OutputParameters["Id"].ToString());
                   string regardingobjectidtype = "tp_productionrequest";


How can I get the plugin to work in the desired way? Is there anything obvious I'm missing? 

My code, such that it is, is below


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ServiceModel;
using Microsoft.Xrm.Sdk;
using Microsoft.Crm.Sdk.Messages;

namespace RollupRefresherPlugin
    public class RefreshRollupPlugin
        public void Execute(IServiceProvider serviceProvider)
            //Common Code for every Plugin
            //ExecutionContext Object
            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

            //OrganizationServiceFactory Object
            IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));

            //OrganizationService Object
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

            Entity task = null;
                if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
                task = (Entity)context.InputParameters["Target"];

                Entity pretask = (Entity)context.PreEntityImages["preimage"];
                var regarding = pretask.GetAttributeValue<EntityReference>("regarding").Id;

                CalculateRollupFieldRequest request = new CalculateRollupFieldRequest
                    Target = new EntityReference("tp_productionrequest", regarding),
                    FieldName = "tp_CompleteTasks" // Rollup Field Name
                CalculateRollupFieldResponse response = (CalculateRollupFieldResponse)service.Execute(request);

            catch (Exception ex)
                throw new InvalidPluginExecutionException(ex.Message);



Many thanks in advance


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