Reference

OpcClient.ReadNodeValues Method

Type

OpcClient

Namespace

Opc.UaFx.Client

Assembly

Opc.UaFx.Advanced.dll

Package

Opc.UaFx.Advanced v2.59.0

Members

OpcClient Members

Also in

Opc.UaFx.Client

2 overloads · since v2.8

Overload	Description
ReadNodeValues(IEnumerable<IOpcNodeValue>)since v2.8	Reads the Value attributes of the nodes specified.
ReadNodeValues(params IOpcNodeValue[])since v2.8	Reads the Value attributes of the nodes specified.

Known results: BadNodeIdInvalid, BadNodeIdUnknown, BadAttributeInvalid, BadIndexRangeInvalid, BadIndexRangeNoData, BadDataEncodingInvalid, BadDataEncodingUnsupported, BadNotReadable, BadUserAccessDenied

Exceptions (all overloads)

Exception	Condition
InvalidOperationException	The read service is currently not supported, especially using the nodes specified.
ObjectDisposedException	The object has been disposed of.
OpcException	The service execution failed upon different circumstances; for more details see exception details. The following issues can lead to that exception: BadNothingToDo, BadTooManyOperations, BadMaxAgeInvalid and BadTimestampsToReturnInvalid.

ReadNodeValues(IEnumerable<IOpcNodeValue>)

since v2.8

Reads the Value attributes of the nodes specified.

public IEnumerable<OpcValue> ReadNodeValues(IEnumerable<IOpcNodeValue> nodes)

Public Function ReadNodeValues(
    nodes As IEnumerable(Of IOpcNodeValue)) As IEnumerable(Of OpcValue)

Parameters

Name	Type	Description
nodes	IEnumerable<IOpcNodeValue>	A sequence of IOpcNodeValue instances which representing the nodes its Value is to be read.

Returns

IEnumerable<OpcValue>

A sequence of OpcValue instances its number and order of items matches the number and order of items in the nodes sequence. There is for each entry in nodes one entry which stores the Value of the node described by the entry in nodes specified.

Exceptions

Exception	Condition
ArgumentNullException	The nodes sequence or one of its items is a null reference (Nothing in Visual Basic).

ReadNodeValues(params IOpcNodeValue[])

since v2.8

Reads the Value attributes of the nodes specified.

public IEnumerable<OpcValue> ReadNodeValues(params IOpcNodeValue[] nodes)

Public Function ReadNodeValues(
    ParamArray nodes As IOpcNodeValue()) As IEnumerable(Of OpcValue)

Parameters

Name	Type	Description
nodes	params IOpcNodeValue[]	An array of IOpcNodeValue instances which representing the nodes its Value is to be read.

Returns

IEnumerable<OpcValue>

Exceptions

Exception	Condition
ArgumentNullException	The nodes array or one of its items is a null reference (Nothing in Visual Basic).