Discover Method (EasyUAClient)

Discovers available OPC-UA applications or endpoints and returns information about them, using the specified discovery query.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Function Discover( _
   ByVal discoveryQuery As UADiscoveryQuery _
) As UADiscoveryElementCollection

'Usage
 
Dim instance As EasyUAClient
Dim discoveryQuery As UADiscoveryQuery
Dim value As UADiscoveryElementCollection
 
value = instance.Discover(discoveryQuery)

public UADiscoveryElementCollection Discover( 
   UADiscoveryQuery discoveryQuery
)

public:
UADiscoveryElementCollection^ Discover( 
   UADiscoveryQuery^ discoveryQuery
)

Parameters

discoveryQuery: Specifies a discovery query.

Return Value

Returns a collection of application elements (usually servers, OpcLabs.EasyOpc.UA.Discovery.UADiscoveryElement).

Exceptions

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.
OpcLabs.EasyOpc.UA.OperationModel.UAException	The OPC UA operation has failed.

Remarks

This is a generic method that allows for different types of discovery queries. In most cases, it is more practical to use an (extension) method that is already tailored to a concrete type of query, e.g. IEasyUAClientExtension.DiscoverLocalApplications, IEasyUAClientExtension.DiscoverLocalServers, or IEasyUAClientExtension.FindLocalApplications.

See also in Knowledge Base: Technical note-OPC UA Discovery in QuickOPC.

Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2012 R2, Windows Server 2016; .NET: Linux, macOS, Microsoft Windows

Reference

EasyUAClient Class
EasyUAClient Members

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