OPC Studio User's Guide and Reference
Read(IEnumerable<UAMapping>) Method



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.LiveMapping Namespace > UAClientMapper Class > Read Method : Read(IEnumerable<UAMapping>) Method
The mappings to be operated upon.
Executes the "Read" operation on given mappings.
Syntax
'Declaration
 
Public Overloads Sub Read( _
   ByVal mappings As IEnumerable(Of UAMapping) _
) 
'Usage
 
Dim instance As UAClientMapper
Dim mappings As IEnumerable(Of UAMapping)
 
instance.Read(mappings)
public void Read( 
   IEnumerable<UAMapping> mappings
)
public:
void Read( 
   IEnumerable<UAMapping^>^ mappings
) 

Parameters

mappings
The mappings to be operated upon.
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.

The component is not licensed for the operation requested.
Remarks
The "Read" operation reads a value of an OPC node and stores it into the mapping source. Only mappings of type UAClientDataMapping that include UADataMappingOperations.Read in their UAClientDataMapping.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

See Also