Cannot instantiate Optional Variable Properties.

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Jr. Member
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Joined: 09 Dec 2020, 11:53

Cannot instantiate Optional Variable Properties.

Post by alilazzal »


I have already been through this forum already and found 2/3 questions related to this but somehow solution is not working for me.

In my Information Model, I have several variable properties under an object type. However, only one property is mandatory and rest are all optional. How can I instantiate the optional properties (an example would be of great help).

Do I use optionalbrowsepath in my createobjectsettings like this ?

CreateObjectSettings settings = new CreateObjectSettings()

ParentNodeId = UnifiedAutomation.UaBase.ObjectIds.ObjectsFolder,
ReferenceTypeId = UnifiedAutomation.UaBase.ReferenceTypeIds.Organizes,
RequestedNodeId = new NodeId(DepartmentA, DefaultNamespaceIndex),
BrowseName = new QualifiedName(DepartmentA, DefaultNamespaceIndex),
TypeDefinitionId = new NodeId(MyA.MyAIm.ObjectTypes.BodyShopProEType, DefaultNamespaceIndex),
OptionalBrowsePaths = new List<string> { AbsoluteName.ToString(BrowseNames.CounterPerType, BrowseNames.CounterTotal)}


ObjectNode DepartmentANode = CreateObject(Server.DefaultRequestContext, settings);

Note: in my IM: the optional nodes are located in a Object called ProdData in Object Type BodyShopProEType

with this, I do not get optional properties in UA Expert.

Furthermore, as you have mentioned to use CreateInstanceSetting, an example of it's structure(syntax) would make things more clear ?

Looking forward to your suggestions...



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Posts: 2
Joined: 11 Feb 2021, 16:04

Re: Cannot instantiate Optional Variable Properties.

Post by RKM »


this question is also of interest for me. Anyone got a solution to that?

Thanks in advance for the help!



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Support Team
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Posts: 2644
Joined: 18 Mar 2011, 15:09

Re: Cannot instantiate Optional Variable Properties.

Post by Support Team »

Hello Ali,

your solution is very close.

But one thing is still missing. The values you used in the AbsoluteName.ToString() method must be QualifiedNames.
It should look like this:

Code: Select all

OptionalBrowsePaths = new List<string> { AbsoluteName.ToString(new QualifiedName(BrowseNames.CounterPerType, DefaultNamespaceIndex))}
If you have more optional elements, expand the list.
Best regards
Unified Automation Support Team

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