internal void ChangeRelationshipState(EntityEntry targetEntry, RelatedEnd relatedEnd, EntityState requestedState)
{
Debug.Assert(requestedState != EntityState.Modified, "Invalid requested state for relationsihp");
Debug.Assert(State != EntityState.Modified, "Invalid initial state for relationsihp");
var initialState = State;
switch (initialState)
{
case EntityState.Added:
switch (requestedState)
{
case EntityState.Added:
// no-op
break;
case EntityState.Unchanged:
AcceptChanges();
break;
case EntityState.Deleted:
AcceptChanges();
// cascade deletion is not performed because TransactionManager.IsLocalPublicAPI == true
Delete();
break;
case EntityState.Detached:
// cascade deletion is not performed because TransactionManager.IsLocalPublicAPI == true
Delete();
break;
default:
Debug.Assert(false, "Invalid requested state");
break;
}
break;
case EntityState.Unchanged:
switch (requestedState)
{
case EntityState.Added:
ObjectStateManager.ChangeState(this, EntityState.Unchanged, EntityState.Added);
State = EntityState.Added;
break;
case EntityState.Unchanged:
//no-op
break;
case EntityState.Deleted:
// cascade deletion is not performed because TransactionManager.IsLocalPublicAPI == true
Delete();
break;
case EntityState.Detached:
// cascade deletion is not performed because TransactionManager.IsLocalPublicAPI == true
Delete();
AcceptChanges();
break;
default:
Debug.Assert(false, "Invalid requested state");
break;
}
break;
case EntityState.Deleted:
switch (requestedState)
{
case EntityState.Added:
relatedEnd.Add(
targetEntry.WrappedEntity,
applyConstraints: true,
addRelationshipAsUnchanged: false,
relationshipAlreadyExists: true,
allowModifyingOtherEndOfRelationship: false,
forceForeignKeyChanges: true);
ObjectStateManager.ChangeState(this, EntityState.Deleted, EntityState.Added);
State = EntityState.Added;
break;
case EntityState.Unchanged:
relatedEnd.Add(
targetEntry.WrappedEntity,
applyConstraints: true,
addRelationshipAsUnchanged: false,
relationshipAlreadyExists: true,
allowModifyingOtherEndOfRelationship: false,
forceForeignKeyChanges: true);
ObjectStateManager.ChangeState(this, EntityState.Deleted, EntityState.Unchanged);
State = EntityState.Unchanged;
break;
case EntityState.Deleted:
// no-op
break;
case EntityState.Detached:
AcceptChanges();
break;
default:
Debug.Assert(false, "Invalid requested state");
break;
}
break;
default:
Debug.Assert(false, "Invalid entry state");
break;
}
}
