OPC Studio User's Guide and Reference
UAReadArguments Constructor(UAAttributeArguments,UAReadParameters)



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.OperationModel Namespace > UAReadArguments Class > UAReadArguments Constructor : UAReadArguments Constructor(UAAttributeArguments,UAReadParameters)
Attribute arguments object to be copied from.

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

Contains parameters for OPC-UA read operations, such as the maximum age of the value.

Because the OpcLabs.EasyOpc.UA.UAReadParameters has implicit conversions from System.Double and OpcLabs.EasyOpc.UA.AddressSpace.UAQualifiedName, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a double precision floating point number (representing the maximum value age in milliseconds), or an OPC UA qualified name (representing the name of the encoding to be used) in place of this parameter, and the corresponding OPC UA read parameters will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.UAReadParameters.FromDouble or OpcLabs.EasyOpc.UA.UAReadParameters.FromUAQualifiedName static method instead.

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

Initializes a new instance of the class, specifying the attribute arguments, and read parameters.
Syntax
'Declaration
 
Public Function New( _
   ByVal attributeArguments As UAAttributeArguments, _
   ByVal readParameters As UAReadParameters _
)
'Usage
 
Dim attributeArguments As UAAttributeArguments
Dim readParameters As UAReadParameters
 
Dim instance As New UAReadArguments(attributeArguments, readParameters)

Parameters

attributeArguments
Attribute arguments object to be copied from.

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

readParameters
Contains parameters for OPC-UA read operations, such as the maximum age of the value.

Because the OpcLabs.EasyOpc.UA.UAReadParameters has implicit conversions from System.Double and OpcLabs.EasyOpc.UA.AddressSpace.UAQualifiedName, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a double precision floating point number (representing the maximum value age in milliseconds), or an OPC UA qualified name (representing the name of the encoding to be used) in place of this parameter, and the corresponding OPC UA read parameters will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.UAReadParameters.FromDouble or OpcLabs.EasyOpc.UA.UAReadParameters.FromUAQualifiedName static method instead.

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

Exceptions
ExceptionDescription

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

See Also