ListDataSetWriterLocators Method (_UAReadOnlyPubSubConfiguration)

Gets the dataset writer locators for the specified published dataset.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ElementsNotNullAttribute()>
<NotNullAttribute()>
Function ListDataSetWriterLocators( _
   ByVal publishedDataSetName As String, _
   ByVal dataSetFolderPath As Object _
) As Object()

'Usage
 
Dim instance As _UAReadOnlyPubSubConfiguration
Dim publishedDataSetName As String
Dim dataSetFolderPath As Object
Dim value() As Object
 
value = instance.ListDataSetWriterLocators(publishedDataSetName, dataSetFolderPath)

[ElementsNotNull()]
[NotNull()]
object[] ListDataSetWriterLocators( 
   string publishedDataSetName,
   object dataSetFolderPath
)

[ElementsNotNull()]
[NotNull()]
array<Object^>^ ListDataSetWriterLocators( 
   String^ publishedDataSetName,
   Object^ dataSetFolderPath
)

Parameters

publishedDataSetName: The name of the published dataset.
dataSetFolderPath: An optional path to the dataset folder.

Return Value

Returns an array of the dataset writer locators.

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.
OpcLabs.EasyOpc.UA.OperationModel.UAException	The OPC UA operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause. This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.
OpcLabs.EasyOpc.UA.OperationModel.UALogicalException	There is a logical error in the OPC UA operation. This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

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.

OpcLabs.EasyOpc.UA.OperationModel.UAException

The OPC UA operation has failed. This operation exception in uniformly used to allow common handling of various kinds of errors. The System.Exception.InnerException always contains information about the actual error cause.

This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

OpcLabs.EasyOpc.UA.OperationModel.UALogicalException

There is a logical error in the OPC UA operation.

This is an operation error that depends on factors external to your program, and thus cannot be always avoided. Your code must handle it appropriately.

Remarks

In this context, the dataset writer locator is a tuple consisting of

PubSub connection name,
writer group name, and
dataset writer name.

This method complements the ability to obtain OpcLabs.EasyOpc.UA.PubSub.Configuration.UADataSetWriterElement.PublishedDataSetName from the OpcLabs.EasyOpc.UA.PubSub.Configuration.UADataSetWriterElement returned by FindDataSetWriterElement. It would be possible to obtain the data set writer locators using other methods on OpcLabs.EasyOpc.UA.PubSub.Configuration.IUAReadOnlyPubSubConfiguration, but it would be extremely ineffective, especially in case of OpcLabs.EasyOpc.UA.PubSub.Configuration.Implementation.UAPubSubClientConfiguration, as references (of type OpcLabs.EasyOpc.UA.AddressSpace.Standard.UAReferenceTypeIds.DataSetToWriter) exist in the address space to allow the data set writer be found easily.

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

_UAReadOnlyPubSubConfiguration Interface
_UAReadOnlyPubSubConfiguration Members

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