How to implement a method to a node that load from a xml nodeset file

[xky0007]

Type of issue

• Bug
• Enhancement
• Compliance
• Question
• Help wanted

Current Behavior

How to implement a method to a node that load from a xml nodeset file?
I know the nsu and id for the method node. How to bind it to C# method?

Thanks.

Expected Behavior

No response

Steps To Reproduce

No response

Environment

No response

Anything else?

No response

[romanett]

@xky0007
To allow you to implement methods the best procedure is to generate the needed boilerplate code using the OPC Foundation Model Compiler:

https://github.com/OPCFoundation/UA-ModelCompiler

Afterwards you could override the LoadPredefined Nodes method to load the generated nodes:

UA-.NETStandard/Libraries/Opc.Ua.Gds.Server.Common/ApplicationsNodeManager.cs

Line 358 in 3583373

protected override NodeStateCollection LoadPredefinedNodes(ISystemContext context)

Now you override the AddBehaviourToPredefined Nodes method to link you implementation:

UA-.NETStandard/Libraries/Opc.Ua.Gds.Server.Common/ApplicationsNodeManager.cs

Line 368 in 3583373

protected override NodeState AddBehaviourToPredefinedNode(ISystemContext context, NodeState predefinedNode)

Hope this helps.

[xky0007]

@romanett Thanks. I override the AddBehaviourToPredefinedNode and try to add input args and bind to a method as follow.
But it seems the input args are not binded.

if(predefinedNode.DisplayName == "TestMethod2")
{
    Debug.WriteLine(predefinedNode.DisplayName);

    var node = predefinedNode as MethodState;

    node.InputArguments = new PropertyState<Argument[]>(node.Parent)
    {
        NodeId = new NodeId($"iiiii_InputArguments", 4),
        BrowseName = BrowseNames.InputArguments,
        DisplayName = new Opc.Ua.LocalizedText("Input Arguments"),
        TypeDefinitionId = VariableTypeIds.PropertyType,
        DataType = DataTypeIds.Argument,
        ValueRank = ValueRanks.OneDimension,
        Value = new Argument[]
            {
                new Argument
                {
                    Name = "Input1",
                    Description = new Opc.Ua.LocalizedText("First input parameter"),
                    DataType = DataTypeIds.String,
                    ValueRank = ValueRanks.Scalar
                },
                new Argument
                {
                    Name = "Input2",
                    Description = new Opc.Ua.LocalizedText("Second input parameter"),
                    DataType = DataTypeIds.Int32,
                    ValueRank = ValueRanks.Scalar
                }
            }
                };
    node.OnCallMethod = new GenericMethodCalledEventHandler(OnStart);


}

return base.AddBehaviourToPredefinedNode(context, predefinedNode);

[romanett]

@xky0007 if you define the method in your nodeset2 xml with input arguments then the modelCompiler will create an override for MethodState with an intialization vector that represents the arguments, therefore the client will know the input / output arguments, then you can use this code to intialize:

MethodState passiveMethod = predefinedNode as MethodState;
if (passiveMethod == null)
{
    return predefinedNode;
}

if (passiveMethod.NodeId == MethodIds.TestMethod2)
{
    TestMethod2MethodState activeNode = new TestMethod2MethodState (passiveMethod.Parent);
    activeNode.Create(context, passiveMethod);

    // replace the node in the parent.
    if (passiveMethod.Parent != null)
    {
        passiveMethod.Parent.ReplaceChild(context, activeNode);
    }

    activeNode.OnCall = OnTestMethod2Call;

    return activeNode;
}