QuickOPC User's Guide and Reference
BrowseTree(IEasyAEClient,AEBrowseArguments,Func<IEnumerable<AENodeElement>,IEnumerable<AENodeElement>>) Method



OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.AlarmsAndEvents.Extensions Namespace > IEasyAEClientExtension2 Class > BrowseTree Method : BrowseTree(IEasyAEClient,AEBrowseArguments,Func<IEnumerable<AENodeElement>,IEnumerable<AENodeElement>>) Method
The client object that will perform the operation.
Holds arguments needed to browse OPC A&E server nodes.
Transforms a sequence of child node elements before it is used for further browsing.
Allows to traverse through OPC A&E address space nodes under the specified node, using given browse arguments, transforming the sequence of child node elements using a specified function.
Syntax

Parameters

client
The client object that will perform the operation.
browseArguments
Holds arguments needed to browse OPC A&E server nodes.
nodeElementsTransformer
Transforms a sequence of child node elements before it is used for further browsing.

Return Value

Returns an enumerator of tree positions that will traverse through all nodes specified.
Exceptions
ExceptionDescription

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Remarks

If you want to enumerate through a sequence of the tree nodes, convert the result to a sequence using the OpcLabs.BaseLib.Graphs.Extensions.ITreeTraversableExtension.ToEnumerable<T> method.

The method automatically prevents recursion into nodes that have already been traversed.

The root position in a tree will correspond to the specified starting node. The OpcLabs.EasyOpc.AlarmsAndEvents.Graphs.AENodeTreePosition object for the root is special one, in that from its OpcLabs.EasyOpc.AlarmsAndEvents.AddressSpace.AENodeElement properties, only its QualifiedName is filled in.

Requirements

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

See Also