UAEventFilter Constructor(UAEventFilter)

The event filter object to be copied from.

Because the UAEventFilter has an implicit conversion from UAAttributeFieldCollection, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use an OPC UA attribute field collection (representing the Select clauses of the event filter) in place of this parameter, and the corresponding OPC UA event filter will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the FromUAAttributeFieldCollection static method instead.

Also, because the UAEventFilterBuilder has an implicit conversion to UAEventFilter, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a UAEventFilterBuilder in place of this parameter, and the corresponding OPC UA event filter will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can convert a UAEventFilterBuilder to UAEventFilter using the UAEventFilterBuilder.ToUAEventFilter static method instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

Initializes a new copy of the object.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Function New( _
   ByVal eventFilter As UAEventFilter _
)

'Usage
 
Dim eventFilter As UAEventFilter
 
Dim instance As New UAEventFilter(eventFilter)

public UAEventFilter( 
   UAEventFilter eventFilter
)

public:
UAEventFilter( 
   UAEventFilter^ eventFilter
)

Parameters

eventFilter

The event filter object to be copied from.

The value of this parameter cannot be null (Nothing in Visual Basic).

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.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.

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

UAEventFilter Class
UAEventFilter Members
Overload List

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