GetEffectiveHostNames Method (

Get the effective application host names.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<JetBrains.Annotations.ItemNotNullAttribute()>
<JetBrains.Annotations.MustUseReturnValueAttribute()>
<JetBrains.Annotations.NotNullAttribute()>
<JetBrains.Annotations.PureAttribute()>
Function GetEffectiveHostNames( _
   ByVal hostNames As Object _
) As StringCollection

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

[JetBrains.Annotations.ItemNotNull()]
[JetBrains.Annotations.MustUseReturnValue()]
[JetBrains.Annotations.NotNull()]
[JetBrains.Annotations.Pure()]
StringCollection GetEffectiveHostNames( 
   object hostNames
)

[JetBrains.Annotations.ItemNotNull()]
[JetBrains.Annotations.MustUseReturnValue()]
[JetBrains.Annotations.NotNull()]
[JetBrains.Annotations.Pure()]
StringCollection^ GetEffectiveHostNames( 
   Object^ 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.
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.ObjectDisposedException	An operation was performed on a disposed object.

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.ObjectDisposedException An operation was performed on a disposed object.

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.

This member or type is for use from COM. It is not meant to be used from .NET or Python. Refer to the corresponding .NET member or type instead, if you are developing in .NET or Python.

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

_EasyUAApplication Interface
_EasyUAApplication Members
HostNames Property

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