TopicWrite Property (_EasyDAClientHoldPeriods)

After an item write call, connection to an OPC item will be maintained at least for the time period specified here.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Property TopicWrite As Integer

'Usage
 
Dim instance As _EasyDAClientHoldPeriods
Dim value As Integer
 
instance.TopicWrite = value
 
value = instance.TopicWrite

int TopicWrite {get; set;}

property int TopicWrite {
   int get();
   void set (    int value);
}

Remarks

This property is used by following client implementations:

Native client: yes
NET API client: no

Example

CSharp
VB.NET

// This example shows how the OPC server can quickly be disconnected after writing a value into one of its OPC items.

using System;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.OperationModel;

namespace DocExamples.DataAccess._EasyDAClientHoldPeriods
{
    class TopicWrite
    {
        public static void Main1()
        {
            // Instantiate the client object.
            var client = new EasyDAClient();

            client.InstanceParameters.HoldPeriods.TopicWrite = 100; // in milliseconds

            try
            {
                client.WriteItemValue("", "OPCLabs.KitServer.2", "Simulation.Register_I4", 12345);
            }
            catch (OpcException opcException)
            {
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message);
            }
        }
    }
}

' This example shows how the OPC server can quickly be disconnected after writing a value into one of its OPC items.

Imports OpcLabs.EasyOpc.DataAccess
Imports OpcLabs.EasyOpc.OperationModel

Namespace DocExamples.DataAccess._EasyDAClientHoldPeriods
    Friend Class TopicWrite
        Public Shared Sub Main1()
            Dim client = New EasyDAClient()

            client.InstanceParameters.HoldPeriods.TopicWrite = 100 ' in milliseconds

            Try
                client.WriteItemValue("", "OPCLabs.KitServer.2", "Simulation.Register_I4", 12345)
            Catch opcException As OpcException
                Console.WriteLine("*** Failure: {0}", opcException.GetBaseException().Message)
            End Try
        End Sub
    End Class
End Namespace

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012, Windows Server 2016; .NET Core, .NET 5, .NET 6: Linux, macOS, Microsoft Windows

Reference

_EasyDAClientHoldPeriods Interface
_EasyDAClientHoldPeriods Members