'Declaration
 
<ExtensionAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function GetDirectoryContents2( _
   ByVal fileTransfer As IEasyUAFileTransfer, _
   ByVal endpointDescriptor As UAEndpointDescriptor, _
   ByVal directoryNamedNodePath As UANamedNodePath _
) As IDirectoryContents2

'Usage
 
Dim fileTransfer As IEasyUAFileTransfer
Dim endpointDescriptor As UAEndpointDescriptor
Dim directoryNamedNodePath As UANamedNodePath
Dim value As IDirectoryContents2
 
value = IEasyUAFileTransferExtension.GetDirectoryContents2(fileTransfer, endpointDescriptor, directoryNamedNodePath)

[Extension()]
[NotNull()]
public static IDirectoryContents2 GetDirectoryContents2( 
   IEasyUAFileTransfer fileTransfer,
   UAEndpointDescriptor endpointDescriptor,
   UANamedNodePath directoryNamedNodePath
)

[Extension()]
[NotNull()]
public:
static IDirectoryContents2^ GetDirectoryContents2( 
   IEasyUAFileTransfer^ fileTransfer,
   UAEndpointDescriptor^ endpointDescriptor,
   UANamedNodePath^ directoryNamedNodePath
) 

Parameters

fileTransfer

The OPC UA file transfer object that will perform the operation.

endpointDescriptor

Endpoint descriptor. Identifies the OPC-UA server.

directoryNamedNodePath

A named node path of the OPC UA directory.

Return Value

Similar to .

This method does not make any OPC UA operation, and does not throw the usual OpcLabs.EasyOpc.UA.OperationModel.UAException. You can therefore always safely use it to obtain the result interface. All OPC UA operations are made later, on the returned object, and also operation-related exceptions are thrown at that time.

If the directory does not exist, an exception is not thrown until the first time a property is accessed or a method is called on the returned object.

The returned directory content object allows only read-only operations on the directory - such as test for its existence, and enumeration of child files and directories. If you need operations that modify the directory or the file system, you need to obtain the OpcLabs.BaseLib.Extensions.FileProviders.IWritableDirectoryContents interface instead, by calling the GetWritableDirectoryContents(IEasyUAFileTransfer,UAEndpointDescriptor,UANamedNodePath) method.

Accessing OPC UA files and directories over the abstract file provider model (based on Microsoft.Extensions.FileProviders.IFileProvider, Microsoft.Extensions.FileProviders.IFileInfo, OpcLabs.BaseLib.Extensions.FileProviders.IDirectoryContents2 and their "writable" counterparts), which is what this method does, is highly recommended over the other, lower-level methods. Once you obtained the generalized interface in the file provider model, operations on files and directories can be performed using just names and paths, without having to deal with OPC UA nodes and references.

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