Dynamics CRM Plugin - Refresh rollup on delete

Question

I have a specific situation that I need to handle. I have a plugin that refreshes specific rollup field on invoice when invoice detail is created or updated. Now I need to refresh that field when invoice detail is deleted.

---

Analyzing this problem, I realized that I cannot refresh rollup field on pre operation because the invoice detail record is not deleted yet, and on post operation I cannot retrieve invoice Guid from that particular record because it is gone.

Here the piece of code that handles rollup refresh on create/update:

Entity invoiceDetail = service.Retrieve("invoicedetail", targetId, new ColumnSet(true));
Guid invoiceID = ((EntityReference)invoiceDetail["invoiceid"]).Id;
if (targetEntity.Attributes.Contains("extendedamount"))
{
    Entity myEntity = service.Retrieve("invoice", invoiceID, new ColumnSet(true));
    CalculateRollupFieldRequest rollupRequest = new CalculateRollupFieldRequest
    {
        Target = new EntityReference("invoice", invoiceID),
        FieldName = "detailamount"
    };
    CalculateRollupFieldResponse response = (CalculateRollupFieldResponse)service.Execute(rollupRequest);
    myEntity = response.Entity;
    service.Update(myEntity);
}

Do you have any suggestions? I am going mad over this and can't think of anything...

Answer 1

You can get guid on pre-event, and pass it to post-event - MSDN documentation

sample code from MSDN:

using System;

// Microsoft Dynamics CRM namespace(s)
using Microsoft.Xrm.Sdk;

namespace Microsoft.Crm.Sdk.Samples
{
    /// <summary>
    /// A plug-in that sends data to another plug-in through the SharedVariables
    /// property of IPluginExecutionContext.
    /// </summary>
    /// <remarks>Register the PreEventPlugin for a pre-operation stage and the 
    /// PostEventPlugin plug-in on a post-operation stage.
    /// </remarks>
    public class PreEventPlugin : IPlugin
    {
        public void Execute(IServiceProvider serviceProvider)
        {
            // Obtain the execution context from the service provider.
            Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext)
                serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));

            // Create or retrieve some data that will be needed by the post event
            // plug-in. You could run a query, create an entity, or perform a calculation.
            //In this sample, the data to be passed to the post plug-in is
            // represented by a GUID.
            Guid contact = new Guid("{74882D5C-381A-4863-A5B9-B8604615C2D0}");

            // Pass the data to the post event plug-in in an execution context shared
            // variable named PrimaryContact.
            context.SharedVariables.Add("PrimaryContact", (Object)contact.ToString());
        }
    }

    public class PostEventPlugin : IPlugin
    {
        public void Execute(IServiceProvider serviceProvider)
        {
            // Obtain the execution context from the service provider.
            Microsoft.Xrm.Sdk.IPluginExecutionContext context = (Microsoft.Xrm.Sdk.IPluginExecutionContext)
                serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));

            // Obtain the contact from the execution context shared variables.
            if (context.SharedVariables.Contains("PrimaryContact"))
            {
                Guid contact =
                    new Guid((string)context.SharedVariables["PrimaryContact"]);

                // Do something with the contact.
            }
        }
    }
}