GetEffectiveHostNames Method (AbstractEasyUAClientServerApplication)

Get the effective application host names.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public MustOverride Function GetEffectiveHostNames( _
   ByVal hostNames As StringCollection _
) As StringCollection

'Usage
 
Dim instance As AbstractEasyUAClientServerApplication
Dim hostNames As StringCollection
Dim value As StringCollection
 
value = instance.GetEffectiveHostNames(hostNames)

public abstract StringCollection GetEffectiveHostNames( 
   StringCollection hostNames
)

public:
abstract StringCollection^ GetEffectiveHostNames( 
   StringCollection^ hostNames
)

Parameters

hostNames

A collection of host names to be used, or null to use the HostNames specified for the application.

The value of this parameter can be null (Nothing in Visual Basic).

The individual elements of the parameter value cannot be null (Nothing in Visual Basic).

Return Value

If are empty, returns default host names. Otherwise, returns the .

This method never returns null (Nothing in Visual Basic).

The individual elements of the returned value are never null (Nothing in Visual Basic).

This return value of this method should not be ignored.

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.
System.ObjectDisposedException	An operation was performed on a disposed object.
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.

System.ObjectDisposedException An operation was performed on a disposed object.

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 is pure, i.e. it does not have observable side effects.

For server applications, the default host names consist of known DNS and NetBIOS names and IPv4 and IPv6 addresses of the local host. For applications that are not servers, the default host names are empty.

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

AbstractEasyUAClientServerApplication Class
AbstractEasyUAClientServerApplication Members
HostNames Property

Documentation Home, Send Feedback. Resources: Knowledge Base, Product Downloads. Technical support: Online Forums, FAQ.

Missing some example? Ask us for it on our Online Forums! You do not have to own a commercial license in order to use Online Forums, and we reply to every post.