PostEntityImage in update message post-operartion has no key at all - dynamics-crm-2011

Question

I have registered a plugin for update message of some entity (in post-operation) via CRM tool in Visual Studio and also registered post-image for that plugin like below:
and here is my code :
protected void ExecutePostOpportunityUpdate(LocalPluginContext
localContext)
{
if (localContext == null)
{
throw new ArgumentNullException("localContext");
}
// TODO: Implement your custom Plug-in business logic.
IPluginExecutionContext context = localContext.PluginExecutionContext;
Entity postImage = (Entity)context.PostEntityImages["PostImage"];
....
}
But it throws an error and says that there is no key in PostEntityImages at all. I debugged the plugin and saw that there is no key in that at all.
Would you help me please?

Answer 1

Well looking at your code you have to retrieve the actual entity of Opportunity: Try this
try
{
Entity postOpportunityService = (Entity)context.PostEntityImages["PostImage"];
// Opportunity service's parent opportunity lookup reference
EntityReference opportunityReference = (EntityReference)postOpportunityService.Attributes["mpc_opportunityid"];
// Columns to be retrieved for opportunity (aka. columns to be edited)
ColumnSet opportunityColumnSet = new ColumnSet(new string[] { "estimatedvalue", "mpc_estoneoffinvoicing", "mpc_estinvoicingperyear" });
// Retrieve actual opportunity entity
Entity opportunity = service.Retrieve(opportunityReference.LogicalName, opportunityReference.Id, opportunityColumnSet);
}
catch (FaultException<OrganizationServiceFault> ex) { tracingService.Trace("FaultException", ex.ToString()); }