Read(IEnumerable<IDAClientMapping>) Method

Executes the "Read" operation on given mappings.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overloads Sub Read( _
   ByVal mappings As IEnumerable(Of IDAClientMapping) _
)

'Usage
 
Dim instance As DAClientMapper
Dim mappings As IEnumerable(Of IDAClientMapping)
 
instance.Read(mappings)

public void Read( 
   IEnumerable<IDAClientMapping> mappings
)

public:
void Read( 
   IEnumerable<IDAClientMapping^>^ mappings
)

Parameters

mappings: The mappings to be operated upon.
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.
OpcLabs.BaseLib.Licensing.LicensingException	The component is not licensed for the operation requested.

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.BaseLib.Licensing.LicensingException The component is not licensed for the operation requested.

Remarks

The "Read" operation reads a value of an OPC item and stores it into the mapping source. Only mappings of type DAClientItemMapping that include DAItemMappingOperations.Read in their DAClientItemMapping.Operations are affected; other mappings are ignored.

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

DAClientMapper Class
DAClientMapper Members
Overload List

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