DAReadItemArguments Constructor(ServerDescriptor,DAItemDescriptor,DAReadParameters,Object)

Initializes a new instance of the class. Initializes a new instance of the class, with the specified OPC server and item descriptors, a read parameters, and a user-defined state object.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Function New( _
   ByVal serverDescriptor As ServerDescriptor, _
   ByVal itemDescriptor As DAItemDescriptor, _
   ByVal readParameters As DAReadParameters, _
   ByVal state As Object _
)

'Usage
 
Dim serverDescriptor As ServerDescriptor
Dim itemDescriptor As DAItemDescriptor
Dim readParameters As DAReadParameters
Dim state As Object
 
Dim instance As New DAReadItemArguments(serverDescriptor, itemDescriptor, readParameters, state)

public DAReadItemArguments( 
   ServerDescriptor serverDescriptor,
   DAItemDescriptor itemDescriptor,
   DAReadParameters readParameters,
   object state
)

public:
DAReadItemArguments( 
   ServerDescriptor^ serverDescriptor,
   DAItemDescriptor^ itemDescriptor,
   DAReadParameters^ readParameters,
   Object^ state
)

Parameters

serverDescriptor: The OPC server involved in the operation.
itemDescriptor: The OPC item involved in the operation.
readParameters: The read parameters (such as data source or value age).
state: The state object (can be any value supplied by your code); available in event notifications.

Exceptions

Exception Description

Exception	Description
System.ArgumentNullException	A `null` reference (`Nothing` in Visual Basic) is passed to a method that does not accept it as a valid argument. This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

System.ArgumentNullException

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

Reference

DAReadItemArguments Class
DAReadItemArguments Members
Overload List

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