ReadParameters Property (_UAReadArguments)

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

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<JetBrains.Annotations.NotNullAttribute()>
Property ReadParameters As UAReadParameters

'Usage
 
Dim instance As _UAReadArguments
Dim value As UAReadParameters
 
instance.ReadParameters = value
 
value = instance.ReadParameters

[JetBrains.Annotations.NotNull()]
UAReadParameters ReadParameters {get; set;}

[JetBrains.Annotations.NotNull()]
property UAReadParameters^ ReadParameters {
   UAReadParameters^ get();
   void set (    UAReadParameters^ value);
}

Property Value

The value of this property 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.

Remarks

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 OpcLabs.EasyOpc.UA.UAReadParameters value when setting this property, 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.

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

_UAReadArguments Interface
_UAReadArguments Members

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