MS dynamics CRM add record to a1:N realtionship within C#

Question

I have CRM entity called C which has N:1 relationship with entity Account. Account has 1:N relationship with entity B

Problem Statement:

Create a new record for Entity C with update of existing Account(a) (Update in existing account(a) is : a already had two records b1 and b2 of type Entity B . I need to add third record b3 of type Entity B)

Following is my code

_context.Attach(c.relationshipNameWithAccount);
_context.UpdateObject(c.relationshipNameWithAccount);
_context.AddObject(c);
_context.SaveChanges();

This code is executing successfully.

It is Adding a new record in C(as expected) also updating fields in existing record a (as expected) but not adding b3 in existing account a(not expected).

Answer 1

You Can Use AssociateRequest for Your Association like this

EntityReferenceCollection relatedEntities = new EntityReferenceCollection();

relatedEntities.Add(new EntityReference(B, BId));

Relationship relationship = new Relationship("B_RelationName_A");

_service.Associate(A, AId, relationship, relatedEntities);