ReadDataType(IEasyUAClient,UANodeArguments) Method

Reads a value of DataType attribute of a node. Reads a value of DataType attribute of a node, using an arguments object that holds the node information.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<ExtensionAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function ReadDataType( _
   ByVal client As IEasyUAClient, _
   ByVal nodeArguments As UANodeArguments _
) As UANodeId

'Usage
 
Dim client As IEasyUAClient
Dim nodeArguments As UANodeArguments
Dim value As UANodeId
 
value = IEasyUAClientExtension2.ReadDataType(client, nodeArguments)

[Extension()]
[NotNull()]
public static UANodeId ReadDataType( 
   IEasyUAClient client,
   UANodeArguments nodeArguments
)

[Extension()]
[NotNull()]
public:
static UANodeId^ ReadDataType( 
   IEasyUAClient^ client,
   UANodeArguments^ nodeArguments
)

Parameters

client: The client object that will perform the operation.
nodeArguments: An arguments object that specifies the node in the OPC server.

Return Value

If successful, the method returns the actual value of OPC attribute requested.

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.

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.

Remarks

This method also checks whether the returned value is not a reference, and is indeed of the OpcLabs.EasyOpc.UA.AddressSpace.UANodeId type. The returned value is therefore always a valid OpcLabs.EasyOpc.UA.AddressSpace.UANodeId.

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

IEasyUAClientExtension2 Class
IEasyUAClientExtension2 Members
Overload List

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