OPC Studio User's Guide and Reference
DAReadParameters Constructor(DADataSource)



View with Navigation Tools
OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.DataAccess Namespace > DAReadParameters Class > DAReadParameters Constructor : DAReadParameters Constructor(DADataSource)
Selects the data source for OPC reads (from device, from OPC cache, or dynamically determined).
Initializes a new instance of the DAReadParameters object from a given DADataSource.
Syntax
'Declaration
 
Public Function New( _
   ByVal dataSource As DADataSource _
)
 
'Usage
 
Dim dataSource As DADataSource
 
Dim instance As New DAReadParameters(dataSource)

Parameters

dataSource
Selects the data source for OPC reads (from device, from OPC cache, or dynamically determined).
Exceptions
ExceptionDescription

An invalid enumeration value was used.

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

In languages that support implicit conversions (such as C# or VB.NET), in many cases you do not have call this constructor explicitly. When indicated, a call to an available equivalent implicit conversion operator will be created by the compiler automatically.

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