'Declaration
 
Public Function New( _
   ByVal serverDescriptor As ServerDescriptor, _
   ByVal groupParameters As DAGroupParameters, _
   ByVal nodeDescriptor As DANodeDescriptor, _
   ByVal readParameters As DAReadParameters _
)

'Usage
 
Dim serverDescriptor As ServerDescriptor
Dim groupParameters As DAGroupParameters
Dim nodeDescriptor As DANodeDescriptor
Dim readParameters As DAReadParameters
 
Dim instance As New DAMappingContext(serverDescriptor, groupParameters, nodeDescriptor, readParameters)

public DAMappingContext( 
   ServerDescriptor serverDescriptor,
   DAGroupParameters groupParameters,
   DANodeDescriptor nodeDescriptor,
   DAReadParameters readParameters
)

public:
DAMappingContext( 
   ServerDescriptor^ serverDescriptor,
   DAGroupParameters^ groupParameters,
   DANodeDescriptor^ nodeDescriptor,
   DAReadParameters^ readParameters
)

Parameters

serverDescriptor

The OPC server involved in the operation.

Because the OpcLabs.EasyOpc.ServerDescriptor has an implicit conversion from System.Guid, System.String and OpcLabs.EasyOpc.ServerElement, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a GUID (representing the CLSID of the server), a string (representing the so-called OPC server descriptor string, such as a ProgID or the URL of the server), or a OpcLabs.EasyOpc.ServerElement object (result from OPC browsing), in place of this parameter, and the corresponding OPC server descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.ServerDescriptor.FromGuid, OpcLabs.EasyOpc.ServerDescriptor.FromString or OpcLabs.EasyOpc.ServerDescriptor.FromServerElement static method instead.

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

groupParameters

An object containing subscription parameters, such as the requested update rate.

Because the OpcLabs.EasyOpc.DataAccess.DAGroupParameters has an implicit conversion from System.Int32, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use an integer (representing the requested update rate in milliseconds) in place of this parameter, and the corresponding OPC DA group parameters object will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.DataAccess.DAGroupParameters.DAGroupParameters Constructor(Int32) constructor instead.

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

nodeDescriptor

The descriptor of the OPC node involved in the operation.

Because the OpcLabs.EasyOpc.DataAccess.DANodeDescriptor has an implicit conversion from System.String and OpcLabs.EasyOpc.DataAccess.AddressSpace.DANodeElement, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a string (representing the qualified name of the node), or a OpcLabs.EasyOpc.DataAccess.AddressSpace.DANodeElement object (result from OPC browsing), in place of this parameter, and the corresponding OPC DA node descriptor will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.DataAccess.DANodeDescriptor.FromString or OpcLabs.EasyOpc.DataAccess.DANodeDescriptor.FromDANodeElement static method instead.

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

readParameters

The read parameters (such as data source or value age).

Because the OpcLabs.EasyOpc.DataAccess.DAReadParameters has an implicit conversion from System.Int32 and OpcLabs.EasyOpc.DataAccess.DADataSource, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use an integer (representing the value age in milliseconds), or an element of the OpcLabs.EasyOpc.DataAccess.DADataSource enumeration in place of this parameter, and the corresponding OPC DA read parameters object will be constructed automatically. When the implicit conversion operators are not supported (such as with Python.NET), you can use the OpcLabs.EasyOpc.DataAccess.DAReadParameters.DAReadParameters Constructor(Int32) or OpcLabs.EasyOpc.DataAccess.DAReadParameters.DAReadParameters Constructor(DADataSource) constructor instead.

The value of this parameter can 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