Read Structure Decode

[kwonsss]

public class TestStruct : EncodeableObject
{
    public short nInt { get; set; }
    public bool nbool { get; set; }

    public override ExpandedNodeId TypeId => ExpandedNodeId.Parse("nsu=urn:OMRON:NxOpcUaServer:FactoryAutomation;i=5007");

    public override ExpandedNodeId BinaryEncodingId => ExpandedNodeId.Parse("nsu=urn:OMRON:NxOpcUaServer:FactoryAutomation;i=5008");

    public override ExpandedNodeId XmlEncodingId => NodeId.Null;

    public override void Encode(IEncoder encoder)
    {
        encoder.WriteInt16("nInt2", this.nInt);
        encoder.WriteBoolean("nBool", this.nbool);
    }

    public override void Decode(IDecoder decoder)
    {
        this.nInt = decoder.ReadInt16("nInt2");
        this.nbool = decoder.ReadBoolean("nBool");
    }
}

//

public async Task Test(string url)
{
    ApplicationConfiguration config = new ApplicationConfiguration()
    {
        ApplicationName = "ClientPC",
        ApplicationType = ApplicationType.Client,
        TransportQuotas = new TransportQuotas
        {
            OperationTimeout = 600000,
            MaxStringLength = 256,
        },
        ClientConfiguration = new ClientConfiguration
        {
            DefaultSessionTimeout = 60000
        },
    };

    var endpoint = CoreClientUtils.SelectEndpoint(url, useSecurity: false);

    var configuredEndpoint = new ConfiguredEndpoint(null, endpoint, EndpointConfiguration.Create(config));

    OpcUaSession = await Session.Create(config, configuredEndpoint, true, "session_pc", 60000, null, null);

    // write test struct data
    var data1 = new TestStruct { 
        nInt = 9, 
        nbool = true 
    };


    var writeValue = new WriteValue
    {
        NodeId = new NodeId("ns=4;s=Test2Name"),
        AttributeId = Attributes.Value,
        Value = new DataValue()
        {
            Value = new ExtensionObject()
            {
                Body = data1,
            }
        }
    };
    var nodesToWrite = new WriteValueCollection() { writeValue };

    StatusCodeCollection results;

    OpcUaSession.Write(null, nodesToWrite, out results, out _);

    ClientBase.ValidateResponse(results, nodesToWrite);

    // read test struct data
    EncodeableFactory.GlobalFactory.AddEncodeableType(typeof(TestStruct));

    DataValue dataValue = OpcUaSession.ReadValue("ns=4;s=Test2Name");

    var result = ExtensionObject.ToEncodeable((ExtensionObject)dataValue.Value) as TestStruct;

    var obj = (ExtensionObject)dataValue.Value;
    var value1 = (TestStruct)obj.Body;


    Debug.WriteLine($"Result {result}");
}

I understand that the Encode Decode method operates when reading/writing in the "EncodeableObject" inherited class.

It was confirmed that the "Encode" method was called during "Session.Write" and the data was converted. However, in the case of "Session.Read", "Decode" does not seem to be called.

If you try to cast the read data to a structure, "System.InvalidCastException: 'Unable to cast object of type 'System.Byte[]' to type 'OPCApp.Models.TestStruct'.'" occurs. What is the problem?

When is "Decode" Method called?

[kwonsss]

I Solved it.
need to register first before creating a session.
"EncodeableFactory.GlobalFactory.AddEncodeableType" before "Session.Create"