Examples

// This example shows how to write a value into a single node, specifying a type explicitly.
//
// Reasons for specifying the type explicitly might be:
// - The data type in the server has subtypes, and the client therefore needs to pick the subtype to be written.
// - The data type that the server reports is incorrect.
// - Writing with an explicitly specified type is more efficient.
//
// For a selected subset of most common types, you can also use a different overload of the WriteValue method, and specify 
// a value from the TypeCode enumeration instead.

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

namespace UADocExamples._EasyUAClient
{
    partial class WriteValue
    {
        public static void Type()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

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

            // Modify value of a node
            try
            {
                client.WriteValue(
                    endpointDescriptor,
                    "nsu=http://test.org/UA/Data/ ;i=10221",
                    12345,
                    typeof(Int32));
            }
            catch (UAException uaException)
            {
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
            }
        }
    }
}

// This example shows how to write a value into a single node, specifying a type code explicitly.
//
// Reasons for specifying the type explicitly might be:
// - The data type in the server has subtypes, and the client therefore needs to pick the subtype to be written.
// - The data type that the reports is incorrect.
// - Writing with an explicitly specified type is more efficient.
//
// TypeCode is easy to use, but it does not cover all possible types. It is also possible to specify the .NET Type, using
// a different overload of the WriteValue method.

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

namespace UADocExamples._EasyUAClient
{
    partial class WriteValue
    {
        public static void TypeCode()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

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

            Console.WriteLine("Modifying value of a node...");
            try
            {
                client.WriteValue(
                    endpointDescriptor,
                    "nsu=http://test.org/UA/Data/ ;i=10221",
                    12345,
                    System.TypeCode.Int32);
            }
            catch (UAException uaException)
            {
                Console.WriteLine($"*** Failure: {uaException.GetBaseException().Message}");
                return;
            }

            Console.WriteLine("Finished.");
        }
    }
}

// This example shows how to write values into 3 nodes at once, specifying a type explicitly. It tests for success of each 
// write and displays the exception message in case of failure.
//
// Reasons for specifying the type explicitly might be:
// - The data type in the server has subtypes, and the client therefore needs to pick the subtype to be written.
// - The data type that the reports is incorrect.
// - Writing with an explicitly specified type is more efficient.
//
// Alternative ways of specifying the type are using the ValueTypeCode or ValueTypeFullName properties.

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

namespace UADocExamples._EasyUAClient
{
    partial class WriteMultipleValues
    {
        public static void ValueType()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

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

            // Modify value of a node
            OperationResult[] operationResultArray = client.WriteMultipleValues(new[]
                {
                    new UAWriteValueArguments(endpointDescriptor, 
                        "nsu=http://test.org/UA/Data/ ;i=10221", 23456) 
                        {ValueType = typeof(Int32)},    // here is the type explicitly specified
                    new UAWriteValueArguments(endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;i=10226", "This string cannot be converted to Double")
                        {ValueType = typeof(Double)},    // here is the type explicitly specified
                    new UAWriteValueArguments(endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;s=UnknownNode", "ABC")
                        {ValueType = typeof(string)}    // here is the type explicitly specified
                });

            for (int i = 0; i < operationResultArray.Length; i++)
                if (operationResultArray[i].Succeeded)
                    Console.WriteLine("Result {0}: success", i);
                else
                    Console.WriteLine("Result {0}: {1}", i, operationResultArray[i].Exception.GetBaseException().Message);
        }
    }
}

// This example shows how to write values into 3 nodes at once, specifying a type code explicitly. It tests for success of 
// each write and displays the exception message in case of failure.
//
// Reasons for specifying the type explicitly might be:
// - The data type in the server has subtypes, and the client therefore needs to pick the subtype to be written.
// - The data type that the reports is incorrect.
// - Writing with an explicitly specified type is more efficient.
//
// Alternative ways of specifying the type are using the ValueType or ValueTypeFullName properties.

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

namespace UADocExamples._EasyUAClient
{
    partial class WriteMultipleValues
    {
        public static void ValueTypeCode()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

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

            Console.WriteLine("Modifying values of nodes...");
            OperationResult[] operationResultArray = client.WriteMultipleValues(new[]
                {
                    new UAWriteValueArguments(endpointDescriptor, 
                        "nsu=http://test.org/UA/Data/ ;i=10221", 23456) 
                        {ValueTypeCode = TypeCode.Int32},    // here is the type explicitly specified
                    new UAWriteValueArguments(endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;i=10226", "This string cannot be converted to Double")
                        {ValueTypeCode = TypeCode.Double},    // here is the type explicitly specified
                    new UAWriteValueArguments(endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;s=UnknownNode", "ABC")
                        {ValueTypeCode = TypeCode.String}    // here is the type explicitly specified
                });

            for (int i = 0; i < operationResultArray.Length; i++)
                if (operationResultArray[i].Succeeded)
                    Console.WriteLine($"Result {i}: success");
                else
                    Console.WriteLine($"Result {i}: {operationResultArray[i].Exception.GetBaseException().Message}");


            // Example output:
            //
            //Modifying values of nodes...
            //Result 0: success
            //Result 1: Input string was not in a correct format.
            //+ Attempting to change an object of type "System.String" to type "System.Double".
            //+ The specified original value (string) was "This string cannot be converted to Double".
            //+ The node descriptor used was: NodeId="nsu=http://test.org/UA/Data/ ;i=10226".
            //+ The client method called (or event/callback invoked) was 'WriteMultiple[3]'.
            //Result 2: OPC UA service result - {BadNodeIdUnknown}. The node id refers to a node that does not exist in the server address space.
            //+ The node descriptor used was: NodeId="nsu=http://test.org/UA/Data/ ;s=UnknownNode".
            //+ The client method called (or event/callback invoked) was 'WriteMultiple[3]'.
        }
    }
}

// This example shows how to write values into 3 nodes at once, specifying a type's full name explicitly. It tests for 
// success of each write and displays the exception message in case of failure.
//
// Reasons for specifying the type explicitly might be:
// - The data type in the server has subtypes, and the client therefore needs to pick the subtype to be written.
// - The data type that the reports is incorrect.
// - Writing with an explicitly specified type is more efficient.
//
// Alternative ways of specifying the type are using the ValueType or ValueTypeCode properties.

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

namespace UADocExamples._EasyUAClient
{
    partial class WriteMultipleValues
    {
        public static void ValueTypeFullName()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

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

            Console.WriteLine("Modifying values of nodes...");
            OperationResult[] operationResultArray = client.WriteMultipleValues(new[]
                {
                    new UAWriteValueArguments(endpointDescriptor, 
                        "nsu=http://test.org/UA/Data/ ;i=10221", 23456) 
                        {ValueTypeFullName = "System.Int32"},    // here is the type explicitly specified
                    new UAWriteValueArguments(endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;i=10226", "This string cannot be converted to Double")
                        {ValueTypeFullName = "System.Double"},    // here is the type explicitly specified
                    new UAWriteValueArguments(endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;s=UnknownNode", "ABC")
                        {ValueTypeFullName = "System.String"}    // here is the type explicitly specified
                });

            for (int i = 0; i < operationResultArray.Length; i++)
                if (operationResultArray[i].Succeeded)
                    Console.WriteLine($"Result {i}: success");
                else
                    Console.WriteLine($"Result {i}: {operationResultArray[i].Exception.GetBaseException().Message}");
        }
    }
}