// This KEPServerEX/UA example shows how to read the Value attributes of 3 different nodes at once. Using the same method,
// it is also possible to read multiple attributes of the same node.
//
// Find all latest examples here: https://www.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
// OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp .
// Missing some example? Ask us for it on our Online Forums, https://forum.opclabs.com/forum/index ! You do not have to own
// a commercial license in order to use Online Forums, and we reply to every post.

using System;
using OpcLabs.BaseLib.OperationModel;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.AddressSpace;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples.Specialized
{
    partial class Kepware_KEPServerEX_UA
    {
        public static void ReadMultipleValues()
        {
            UAEndpointDescriptor endpointDescriptor = "opc.tcp://localhost:49320";  // default KEPServerEX/UA endpoint 

            // Instantiate the client object.
            var client = new EasyUAClient();

            // Obtain values. By default, the Value attributes of the nodes will be read.
            ValueResult[] valueResultArray = client.ReadMultipleValues(new[]
                {
                    // The UANodeId.KEPServerEX(...) helper method simplifies creation of node IDs for KEPServerEX/UA nodes.
                    new UAReadArguments(endpointDescriptor, UANodeId.KEPServerEX("Simulation Examples.Functions.Random1")),
                    new UAReadArguments(endpointDescriptor, UANodeId.KEPServerEX("Simulation Examples.Functions.Ramp1")),
                    new UAReadArguments(endpointDescriptor, UANodeId.KEPServerEX("Simulation Examples.Functions.Sine1")),
                    new UAReadArguments(endpointDescriptor, UANodeId.KEPServerEX("Simulation Examples.Functions.User1"))
                });

            // Display results.
            foreach (ValueResult valueResult in valueResultArray)
            {
                if (valueResult.Succeeded)
                    Console.WriteLine($"Value: {valueResult.Value}");
                else
                    Console.WriteLine($"*** Failure: {valueResult.ErrorMessageBrief}");
            }
        }
    }
}