'Declaration
 
Public Function New( _
   ByVal machineName As String, _
   ByVal serverClass As String, _
   ByVal itemId As String, _
   ByVal dataType As VarType, _
   ByVal requestedUpdateRate As Integer, _
   ByVal percentDeadband As Single, _
   ByVal callback As OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler(Of T), _
   ByVal state As Object _
)

'Usage
 
Dim machineName As String
Dim serverClass As String
Dim itemId As String
Dim dataType As VarType
Dim requestedUpdateRate As Integer
Dim percentDeadband As Single
Dim callback As OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler(Of T)
Dim state As Object
 
Dim instance As New EasyDAItemSubscriptionArguments(Of T)(machineName, serverClass, itemId, dataType, requestedUpdateRate, percentDeadband, callback, state)

public EasyDAItemSubscriptionArguments<T>( 
   string machineName,
   string serverClass,
   string itemId,
   VarType dataType,
   int requestedUpdateRate,
   float percentDeadband,
   OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler<T> callback,
   object state
)

public:
EasyDAItemSubscriptionArguments<T>( 
   String^ machineName,
   String^ serverClass,
   String^ itemId,
   VarType^ dataType,
   int requestedUpdateRate,
   float percentDeadband,
   OpcLabs.EasyOpc.DataAccess.Generic.EasyDAItemChangedEventHandler<T^>^ callback,
   Object^ state
)

Parameters

machineName

Name of the machine. Determines the computer on which the OPC server is located. May be an empty string, in which case the OPC server is assumed to exist on the local computer or at the computer specified for it by DCOM configuration.

serverClass

Contains ProgID of the OPC server.

itemId

Contains OPC item identifier.

dataType

Specifies the data type requested. Passing OpcLabs.BaseLib.ComInterop.VarTypes.Empty means that the server's canonical data type should be used.

requestedUpdateRate

How often should the updates be received (number of milliseconds).

percentDeadband

The percent change in an item value that will cause an update.

callback

A typed callback method to be invoked for each significant item change.

state

The state object (can be any value supplied by your code); available in event notifications.

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows