'Declaration
 
Public Function New( _
   ByVal callback As EasyUADataSetFieldMessageEventHandler, _
   ByVal state As Object, _
   ByVal connectionDescriptor As UAPubSubConnectionDescriptor, _
   ByVal filter As UASubscribeDataSetFilter, _
   ByVal dataSetMetaData As UADataSetMetaData, _
   ByVal dataSetFieldDescriptor As UADataSetFieldDescriptor _
)

'Usage
 
Dim callback As EasyUADataSetFieldMessageEventHandler
Dim state As Object
Dim connectionDescriptor As UAPubSubConnectionDescriptor
Dim filter As UASubscribeDataSetFilter
Dim dataSetMetaData As UADataSetMetaData
Dim dataSetFieldDescriptor As UADataSetFieldDescriptor
 
Dim instance As New EasyUASubscribeDataSetFieldArguments(callback, state, connectionDescriptor, filter, dataSetMetaData, dataSetFieldDescriptor)

public EasyUASubscribeDataSetFieldArguments( 
   EasyUADataSetFieldMessageEventHandler callback,
   object state,
   UAPubSubConnectionDescriptor connectionDescriptor,
   UASubscribeDataSetFilter filter,
   UADataSetMetaData dataSetMetaData,
   UADataSetFieldDescriptor dataSetFieldDescriptor
)

public:
EasyUASubscribeDataSetFieldArguments( 
   EasyUADataSetFieldMessageEventHandler^ callback,
   Object^ state,
   UAPubSubConnectionDescriptor^ connectionDescriptor,
   UASubscribeDataSetFilter^ filter,
   UADataSetMetaData^ dataSetMetaData,
   UADataSetFieldDescriptor^ dataSetFieldDescriptor
)

Parameters

callback

A callback method to be invoked for each time a dataset field is received.

The value of this parameter cannot be null (Nothing in Visual Basic).

state

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

The value of this parameter can be null (Nothing in Visual Basic).

connectionDescriptor

Descriptor for a PubSub connection (using physical parameters, or logical name).

Because the OpcLabs.EasyOpc.UA.PubSub.UAPubSubConnectionDescriptor has an implicit conversion from OpcLabs.BaseLib.Networking.ResourceAddress and System.String, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.BaseLib.Networking.ResourceAddress object, or a string (the so-called resource description string, usually a resource URL) in place of this parameter, and the corresponding OPC UA PubSub connection descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the FromResourceAddress or FromString static method instead.

Also, because the OpcLabs.EasyOpc.UA.PubSub.Configuration.UAPubSubConnectionElement has an implicit conversion to OpcLabs.EasyOpc.UA.PubSub.UAPubSubConnectionDescriptor, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.EasyOpc.UA.PubSub.Configuration.UAPubSubConnectionElement (from PubSub configuration) in place of this parameter, and the corresponding OPC UA PubSub connection descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can convert a OpcLabs.EasyOpc.UA.PubSub.Configuration.UAPubSubConnectionElement to OpcLabs.EasyOpc.UA.PubSub.UAPubSubConnectionDescriptor using the ToUAPubSubConnectionDescriptor static method instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

filter

Specifies how the incoming PubSub messages should be filtered before being delivered to the application.

Because the OpcLabs.EasyOpc.UA.PubSub.UASubscribeDataSetFilter has an implicit conversion from OpcLabs.EasyOpc.UA.PubSub.UAPublisherId, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.EasyOpc.UA.PubSub.UAPublisherId (containing the publisher Id that you want to allow in the filter) in place of this parameter, and the corresponding OPC UA subscribe dataset filter will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the FromUAPublisherId static method instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

dataSetMetaData

Metadata for the dataset.

The value of this parameter cannot be null (Nothing in Visual Basic).

dataSetFieldDescriptor

The descriptor for the dataset field.

Because the OpcLabs.EasyOpc.UA.PubSub.UADataSetFieldDescriptor has implicit conversions from System.Guid and System.String, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a GUID (representing the dataset field Id), or a string (representing the name of the dataset field) in place of this parameter, and the corresponding OPC UA dataset field descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.UA.PubSub.UADataSetFieldDescriptor.FromGuid or OpcLabs.EasyOpc.UA.PubSub.UADataSetFieldDescriptor.FromString static method instead.

The value of this parameter cannot be null (Nothing in Visual Basic).

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