WriteItemValue<TValue>(IEasyDAClient,String,String,String,TValue) Method

Writes a typed value into a (typed) named item in an OPC server. Only the item's typed value is written (quality and timestamp are not written). Writes a typed value into a named item using individual parameters specifying its location.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Sub WriteItemValue(Of TValue)( _
   ByVal client As IEasyDAClient, _
   ByVal machineName As String, _
   ByVal serverClass As String, _
   ByVal itemId As String, _
   ByVal value As TValue _
)

'Usage
 
Dim client As IEasyDAClient
Dim machineName As String
Dim serverClass As String
Dim itemId As String
Dim value As TValue
 
IEasyDAClientExtension2.WriteItemValue(Of TValue)(client, machineName, serverClass, itemId, value)

[Extension()]
public static void WriteItemValue<TValue>( 
   IEasyDAClient client,
   string machineName,
   string serverClass,
   string itemId,
   TValue value
)

[Extension()]
public:
static void WriteItemValuegeneric<typename TValue>
( 
   IEasyDAClient^ client,
   String^ machineName,
   String^ serverClass,
   String^ itemId,
   TValue^ value
)

Parameters

client: The client object that will perform the operation.
machineName: Name of the machine. Determines the computer on which the OPC server is located. May be an empty string, in which case the OPC server is assumed to exist on the local computer or at the computer specified for it by DCOM configuration.
serverClass: Contains ProgID of the OPC server to write into.
itemId: Contains OPC item identifier.
value: The typed value to be written.

Type Parameters

TValue: The type of item value.

Exceptions

Exception	Description
OpcLabs.EasyOpc.OperationModel.OpcException	Thrown when the OPC operation fails.
System.ArgumentNullException	A `null` reference (`Nothing` in Visual Basic) is passed to a method that does not accept it as a valid argument.

Remarks

The server can be local or can be remotely accessed via DCOM. Optionally, an access path can be specified or a specific data type can be requested.

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

IEasyDAClientExtension2 Class
IEasyDAClientExtension2 Members
Overload List