Trouble with Delete Plug-in Code

• Friday, June 22, 2012 12:43 AM

   

   
  

  0

  I have been trying to write a plug-in that prevents deletion of an opportunity that has its (custom) IsPrimary field set to True.  I got some advice on this forum that throwing an exception would both abort the delete tranaction and send an explanitory message to the user.  I'm growing quite frustrated getting my code to work as even the very simple SDK Sample Code portions of my program appear to fail. 

  Here is my code (stripped back with comments):

  using System;
  using System.Diagnostics;
  using System.Linq;
  using System.ServiceModel;
  using Microsoft.Xrm.Sdk;
  using System.Windows.Forms;
  using System.Collections.Generic;
  
  public class WomDelete : IPlugin
  {
      public void Execute(IServiceProvider serviceProvider)
      {
          IPluginExecutionContext context = 
              (IPluginExecutionContext) serviceProvider.GetService(typeof(IPluginExecutionContext));
  
          Entity entity;
  
          // Check if the input parameters property bag contains a target
          // of the create operation and that target is of type Entity.
          if (context.OutputParameters.Contains("Target") &&
          context.OutputParameters["Target"] is Entity)
          {
              // Obtain the target business entity from the input parameters.
              entity = (Entity)context.OutputParameters["Target"];
  
              // Verify that the entity represents a contact.
              if (entity.LogicalName != "opportunity") { return; }
          }
          else
          {
              throw new InvalidPluginExecutionException("No Target Found.");
              //return;
          }
  
  
          //// Business Logic Section
          //try
          //{
              //IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
              //IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
  
              //Opportunity opp = inputEntity.ToEntity<Opportunity>();   // Translate Late Bound to Early Bound entity
  
              //// If the record to be deleted is marked Primary then abort with message
              //if (opp.new_IsPrimary == true)
              //{
                  throw new InvalidPluginExecutionException("You cannot delete the Primary Workout Method for a loan. Set another Workout Method as Primary and then you can delete this Workout Method.");
              //}
          //}
          //catch (FaultException<OrganizationServiceFault> ex)
          //{
          //    throw new InvalidPluginExecutionException("An error occurred in the Workout Primary Control plug-in.", ex);
          //}
      } // end method
  } // end class
  

  I register have tried registering this plug-in class for "opportunity" entity "Delete" messages on the Pre-Validation, Pre-Operation and Post-Operation pipeline stages.  I have changed InputParameters to OutputParameters for Post-Operation stage.  All have been for Synchronus execution.

  As cuurently coded (above) I get the "No Target Found." exception thrown indicating that the following if test failed:

          if (context.OutputParameters.Contains("Target") &&
          context.OutputParameters["Target"] is Entity)
  

  Since this is right out of vertually all SDK sample plug-in code, I'm at a loss as to where to go next so I have come here (again I have use both "OutputParameters" and "InputParameters" in the above to no avail).

  I would love some guidence on what is wrong with my code and what the correct pipeline stage would be to register it for this type of Delete abort funtionality. 

  BTW, if I comment out all but the:

                  throw new InvalidPluginExecutionException("You cannot delete the Primary Workout Method for a loan. Set another Workout Method as Primary and then you can delete this Workout Method.");

  line of code, it does stop all deletes.  That is about all I have able to accomplish in the considerable amount of time I have been at this seemingly simple task.

  Any help would be very much appreciated.

  • Reply
  • Quote