How to access DOM instance field value from automation script

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Hi,

I'm trying to get information of an DOM instance from an automation script. I'll trigger that script through an low code app and pass the guid of the instance i need to open in the automation script.
Looking at the examples on https://docs.dataminer.services/user-guide/Advanced_Modules/DOM/DOM_examples/DOM_status_system_example.html

there mainly focused on creating and updating fields, but little to no information about reading the information based on having an valid instance guid.

Jens Vandewalle [SLC] [DevOps Enabler] Answered question 14th October 2022

2 Answers

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Hi Gerwin,

Below some code examples in case the script is executed from a DOM button in a Low code app.

Load basics

var instanceId = context.ContextId as DomInstanceId;
var domHelper = new DomHelper(engine.SendSLNetMessages, instanceId.ModuleId);
DomInstance domInstance = GetDomInstance(domHelper, instanceId);

private static DomInstance GetDomInstance(DomHelper domHelper, DomInstanceId instanceId)
{
FilterElement<DomInstance> domInstanceFilter = DomInstanceExposers.Id.Equal(instanceId);

List<DomInstance> domInstances = domHelper.DomInstances.Read(domInstanceFilter);
domHelper.StitchDomInstances(domInstances);

return domInstances.First();
}

Go through Sections > FieldValues and store the data in an object

foreach (var section in domInstance.Sections)
{
foreach (var fieldValue in section.FieldValues)
{
var fieldDescriptor = fieldValue.GetFieldDescriptor();
switch (fieldDescriptor.Name)
{
case "Field Descriptor Name":
data.Name = Convert.ToString(fieldValue.Value.Value);
break;

default:

break;
}
}
}

Jens Vandewalle [SLC] [DevOps Enabler] Answered question 14th October 2022
Gerwin van der Kamp commented

Took some fiddeling but it does work 🙂 thanks!
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1.25K 0 Comments

Hi Gerwin

Retrieving FieldValues from a DOM instance can be done using the following steps:

  1. Create an object of the DomHelper class (DomHelper class | DataMiner Docs)
  2. Create a filter to find the right DOM instance in the collection of instances

    Skyline.DataMiner.Net.Messages.SLDataGateway. ManagedFilter<T, F> domInstanceIdFilter = DomInstanceExposers.Id.Equal(domInstanceId);
    DomInstance domInstance = domHelper.DomInstances.Read(domInstanceIdFilter).FirstOrDefault();

  3. Go through all linked Sections
  4. Use the Skyline.DataMiner.Net.Sections.Section.GetFieldValueById(FieldDescriptorID) method to find the FieldValue (Method GetFieldValueById | DataMiner Docs)

Hopefully this will help you out. Note that there's a change a more efficient way to do this does exist. In case you know a more performant way, please correct my answer.

Kind regards

Michiel Clepkens [SLC] [DevOps Advocate] Answered question 14th October 2022