Namespace: Opc.UaFx
Assemblies: Opc.UaFx.Advanced.dll, Opc.UaFx.Advanced.dll
The IOpcNode interface defines the following members.
Gets or sets the value of the optional DescriptionOpcAttribute which shall explain the meaning of the node.
C#
OpcText Description { get; set; }
Property Value
A localizable instance of the OpcText class which optionally explains the meaning of the node or a null reference (Nothing in Visual Basic) if there is no description associated with the node.
Remarks
The menaning of the node defines the usage, the context and the purpose of the node.
Gets or sets the value of the DisplayNameOpcAttribute which defines the localizable name of the node.
C#
OpcText DisplayName { get; set; }
Property Value
An instance of the OpcText class which defines the localizable name of the node.
Remarks
Client application should use this attribute if they want to display the name of the node to the user. The String part of the DisplayName is restricted to 512 characters.
Gets or sets the value of the BrowseNameOpcAttribute which defines the non-localizable human-readable name used when browsing the address space.
C#
OpcName Name { get; set; }
Property Value
Remarks
The Name should never be used to display the name of the a node. Use the DisplayName instead for this purpose.
Unlike node identifiers the Name cannot be used to unambiguously identify the node. Different nodes may have the same browse name. The namespace is provided to make the browse name unique in some cases in the context of a node (e.g. properties of a node) although not unique in the context of the server. If different organizations define browse names for properties, the namespace of the Name provided by the organization makes the Name unique, although different organizations may use the same string having a slightly different meaning. Servers may often choose to use the same namespace for the node identifier and the browse name. However, if they want to provide a standard property, its browse name shall have the namespace of the standards body although the namespace of the node identifier reflects something else, for example the local server.
It is recommended that standard bodies defining standard type definitions use their namespace for the node identifier of the type definition node as well as for the browse name of the type definition node.
The String-part of the browse name is case sensitive. That is, clients shall consider them case sensitive. Server are allowed to handle browse names passed in service requests as case insensitive.
Use the value of this property to construct browse paths (see OpcNamePath).
Gets or sets the value of the optional UserWriteAccessOpcAttribute which exposes the possibilities of a client to write the attributes of the node taking user access rights into account.
C#
OpcAttributeWriteAccess UserWriteAccess { get; set; }
Property Value
A combination of the members defined by the OpcAttributeWriteAccess enumeration.
Remarks
The mask value of this attribute can only further restrict the WriteAccess attribute, when it is set to not writable in the general case that applies for every user.
Gets or sets the value of the optional WriteAccessOpcAttribute which exposes the posibilities of a client to write the attributes of the node.
C#
OpcAttributeWriteAccess WriteAccess { get; set; }
Property Value
A combination of the members defined by the OpcAttributeWriteAccess enumeration.
Remarks
The mask value of this attribute does not take any user access rights into account, that is, altough an attribute is writable this may be restricted to a certain user / user group.
If a server does not have the ability to get the write mask information for a specific attribute from the underlying system, it should state that it is writable. If a write opertation is called on the attribute, the server should transfer this request and return the corresponding OpcStatusCode if such a request is rejected.
Only in case there a corresponding attribute is set in the mask of this attribute the according attribute is writable; otherwise it can not accessed for writing.
C#
void AddNotifier(OpcContext context, IOpcNode node)
Parameters
context
OpcContext
node
IOpcNode
Exceptions
C#
void ApplyChanges(OpcContext context, bool recursive)
Parameters
context
OpcContext
recursive
Boolean
Exceptions
Retrieves the child node its Name property matches exactly the name
specified.
C#
IOpcNode Child(OpcContext context, OpcName name)
Parameters
context
OpcContext
The OpcContext to use to lookup the requested child node.
name
OpcName
The full qualified OpcName of the node to lookup.
Returns
An instance implementing the IOpcNode interface its Name exactly matches the name
specified, if such a node is a known child node of this node. Otherwise a null reference (Nothing in Visual Basic).
Exceptions
The context
or name
is a null reference (Nothing in Visual Basic).
Retrieves a sequence of all nodes organized as children of this node.
C#
IEnumerable<IOpcNode> Children(OpcContext context)
Parameters
context
OpcContext
The OpcContext to use to lookup the child nodes.
Returns
A sequence of instances implementing the IOpcNode interface which representing the nodes organized as child nodes of this node.
Exceptions
The context
is a null reference (Nothing in Visual Basic).
C#
void RemoveNotifier(OpcContext context, IOpcNode node)
Parameters
context
OpcContext
node
IOpcNode
Exceptions