Get Request Offerings by Service Offering using C#

Question

I utilized the thread
here to build a function to get all request offerings for a specific service offering. However, no data is being returned to the relationship object list. I'm not getting any errors and I've verified there are indeed request offerings assigned to this service
offering. I must be missing something small.
public static IList<RequestOffering> AllRequestOfferings(ServiceOfferingType ServiceOffering)
ManagementPackRelationship mpRelaltionshipSOToRO = mg.EntityTypes.GetRelationshipClass(new Guid("BE417A55-6622-0FC3-FCEA-90CD23E0FC23")); //Define the relationship class as so to ro
IList<EnterpriseManagementRelationshipObject<EnterpriseManagementObject>> lstEMROsSOtoRO = mg.EntityObjects.GetRelationshipObjectsWhereSource<EnterpriseManagementObject>(ServiceOffering.Id, mpRelaltionshipSOToRO, DerivedClassTraversalDepth.None, TraversalDepth.OneLevel, ObjectQueryOptions.Default);
IList<RequestOffering> RequestOfferings = new List<RequestOffering>();
foreach (EnterpriseManagementRelationshipObject<EnterpriseManagementObject> emro in lstEMROsSOtoRO)
ExtensionIdentifier ei = SpecificRequestOfferingExtensionId(emro.TargetObject.Id);
RequestOffering ro = SpecificRequestOffering(ei);
RequestOfferings.Add(ro);
return RequestOfferings;
Any help is appreciated.
Lefka

Answer 1

I assume by "specific Request Offering class" you mean the .NET "RequestOffering" class object/instance? (That's the one you retrieve via the Extensions interface.)
Like I described in the post in your other thread, once you have the EnterpriseManagementObject, you can retrieve the .NET "RequestOffering" class object/instance like this:
ExtensionIdentifier ei = null;
ExtensionIdentifier.TryParse(emoRO[null,"ID"].Value.ToString(), out ei); //emoRO[null,"ID"].Value.ToString() returns the request offering's extension identifier
RequestOffering RO = emg.Extensions.Retrieve<RequestOffering>(ei);
Notice the emoRO[null,"ID"].Value.ToString(). That's the "RequestOffering" extension Identifier needed to retrieve the "RequestOffering" class object/instance. emoRO[null,"ID"] is a _different_ ID than emoRO.Id
You're dealing with SDK .NET classes and objects/instances as well as SCSM classes and objects. They are two different object-oriented concepts. Let me offer a little primer that will hopefully clarify what you're working with :)
First are the SCSM classes and objects. For example, System.RequestOffering is an SCSM class. Your specific request offering is an object of that class (it's an SCSM object). Relationships exist between these SCSM objects (for example, between a request
offering and its service offering).
Next are the SDK .NET classes and objects/instances. "EnterpriseManagementObject" is the .NET class used to represent SCSM objects. An object/instance of this class, for example emoRO, represents a specific SCSM object. The SCSM object's properties
can be accessed via square brackets (ie: emoRO[null,"property"]). Additionally, the emoRO itself has members that further identify the SCSM object, for example, the emoRO.Id property. That emoRO.Id property is the unique identifier for the SCSM
object (and nothing else).
Now, on top of all that are the SDK's .NET "RequestOffering" class objects/instances that you retrieve via the Extensions interface. In order to retrieve one of these "RequestOffering" class objects/instances, you have to know its
Extension Identifier. This extension identifier is stored in the request offering SCSM object in it's "ID" property.
So, to try and summarize (since I tend to ramble on and on):
You're going to retrieve a Service Offering SCSM Object. Next, you're going to retrieve the related request offering SCSM objects (which you've already done). Then, using the [null,"ID"] value from that request offering SCSM object, you're going
to retrieve an instance of the .NET RequestOffering class via the Extensions interface.
So to answer your question, you don't "convert" entity objects to extension objects. You use the values stored in entity objects to retrieve extension objects. :)
(I don't know if this will help or hurt any clarification, but take a look at the request offering SCSM object's PresentationMappingTemplate value. It's a block of XML. That block of XML is a 'serialized' .NET RequestOffering class instance/object.
Basically, when you retrieve a RequestOffering object/instance, the SDK is pulling that block of XML from the request offering SCSM object's PresentationMappingTemplate and deserializing it into a .NET RequestOffering object/instance)