Create<TValue>(UAEndpointDescriptor,UANodeDescriptor,Int32) Method

Endpoint descriptor. Identifies the OPC-UA server.

Because the OpcLabs.EasyOpc.UA.UAEndpointDescriptor has implicit conversions from System.String and System.Uri, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a string (representing the endpoint URL, or a so-called OPC UA endpoint descriptor string), or a System.Uri object, in place of this parameter, and the corresponding endpoint 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.UAEndpointDescriptor.FromString or OpcLabs.EasyOpc.UA.UAEndpointDescriptor.FromUri static method instead.

If you are using OPC Wizard (for server development), an implicit conversion from OpcLabs.EasyOpc.UA.EasyUAServerCore can be used in the same way to simply pass the server object in place of this parameter, which will use its OpcLabs.EasyOpc.UA.EasyUAServerCore.EffectiveServerDescriptor property for the connection.

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

Node descriptor. Identifies the node in OPC UA server's address space.

Because the OpcLabs.EasyOpc.UA.UANodeDescriptor has implicit conversions from OpcLabs.EasyOpc.UA.AddressSpace.UANodeId, OpcLabs.EasyOpc.UA.AddressSpace.UANodeElement, OpcLabs.EasyOpc.UA.Navigation.UABrowsePath and System.String, in languages that support implicit conversion operators (such as C# or VB.NET), you can simply use a OpcLabs.EasyOpc.UA.AddressSpace.UANodeId object (representing the Id of the OPC UA node), a node element object (from OPC UA browsing), OpcLabs.EasyOpc.UA.Navigation.UABrowsePath object (representing OPC UA absolute browse path), or a string (with expanded node Id text) in place of this parameter, and the corresponding 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.UA.UANodeDescriptor.FromString, OpcLabs.EasyOpc.UA.UANodeDescriptor.FromUABrowsePath, OpcLabs.EasyOpc.UA.UANodeDescriptor.FromUANodeElement or OpcLabs.EasyOpc.UA.UANodeDescriptor.FromUANodeId static method instead.

If you are using OPC Wizard (for server development), an implicit conversion from OpcLabs.EasyOpc.UA.NodeSpace.UAServerNode can be used in the same way to simply pass the server node in place of this parameter, which will use its OpcLabs.EasyOpc.UA.NodeSpace.UAServerNode.EffectiveNodeDescriptor property for the operation.

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

Creates a new data change observable for OPC UA monitored item, specifying an OPC UA endpoint descriptor, node descriptor, and sampling rate.

Syntax

Visual Basic
C#
C++/CLI

'Declaration
 
<NotNullAttribute()>
Public Overloads Shared Function Create(Of TValue)( _
   ByVal endpointDescriptor As UAEndpointDescriptor, _
   ByVal nodeDescriptor As UANodeDescriptor, _
   ByVal samplingInterval As Integer _
) As UADataChangeNotificationObservable(Of TValue)

'Usage
 
Dim endpointDescriptor As UAEndpointDescriptor
Dim nodeDescriptor As UANodeDescriptor
Dim samplingInterval As Integer
Dim value As UADataChangeNotificationObservable(Of TValue)
 
value = UADataChangeNotificationObservable.Create(Of TValue)(endpointDescriptor, nodeDescriptor, samplingInterval)

[NotNull()]
public static UADataChangeNotificationObservable<TValue> Create<TValue>( 
   UAEndpointDescriptor endpointDescriptor,
   UANodeDescriptor nodeDescriptor,
   int samplingInterval
)

[NotNull()]
public:
static UADataChangeNotificationObservable<TValue^>^ Creategeneric<typename TValue>
( 
   UAEndpointDescriptor^ endpointDescriptor,
   UANodeDescriptor^ nodeDescriptor,
   int samplingInterval
)

Parameters

endpointDescriptor

Endpoint descriptor. Identifies the OPC-UA server.

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

nodeDescriptor

Node descriptor. Identifies the node in OPC UA server's address space.

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

samplingInterval

The sampling interval (in milliseconds) indicates the fastest rate at which the Server should sample its underlying source for data changes.

Valid values of this parameter are in the range from -1 to 2147483647 (Int32.MaxValue).

Type Parameters

TValue

Return Value

Returns an observable for changes in the given OPC UA monitored item.

This method never returns null (Nothing in Visual Basic).

Remarks

The UAReactive.DefaultClientSelector selector will be used for OPC Unified Architecture operations.

Requirements

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

Reference

UADataChangeNotificationObservable Class
UADataChangeNotificationObservable Members
Overload List

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