DAItemDescriptor Constructor(String,BrowsePath,VarType,String)

Initializes a new instance of the DAItemDescriptor class.Initializes a new instance of the class, with specified item identifier (may be null), browse path (may be empty), data type and access path.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Function New( _
   ByVal itemId As String, _
   ByVal browsePath As BrowsePath, _
   ByVal requestedDataType As VarType, _
   ByVal accessPath As String _
)

'Usage
 
Dim itemId As String
Dim browsePath As BrowsePath
Dim requestedDataType As VarType
Dim accessPath As String
 
Dim instance As New DAItemDescriptor(itemId, browsePath, requestedDataType, accessPath)

public DAItemDescriptor( 
   string itemId,
   BrowsePath browsePath,
   VarType requestedDataType,
   string accessPath
)

public:
DAItemDescriptor( 
   String^ itemId,
   BrowsePath^ browsePath,
   VarType^ requestedDataType,
   String^ accessPath
)

Parameters

itemId: Contains OPC item identifier.
browsePath: Contains the browse path for the OPC item.
requestedDataType: Specifies the data type requested. Passing OpcLabs.BaseLib.ComInterop.VarTypes.Empty means that the server's canonical data type should be used.
accessPath: An optional data path suggestion to the server.

Exceptions

Exception Description

Exception	Description
System.ArgumentException	One of the arguments provided to a method is not valid. 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.

System.ArgumentException

One of the arguments provided to a method is not valid.

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

DAItemDescriptor Class
DAItemDescriptor Members
Overload List

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