OPC Studio User's Guide and Reference
Keys Property (AECategoryElementCollection)



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OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.AlarmsAndEvents.AddressSpace Namespace > AECategoryElementCollection Class : Keys Property
A collection of Category Ids that are keys to the category elements in the dictionary.
Syntax
'Declaration
 
<CanBeNullAttribute()>
<XmlIgnoreAttribute()>
Public ReadOnly Property Keys As ICollection(Of Long)
 
'Usage
 
Dim instance As AECategoryElementCollection
Dim value As ICollection(Of Long)
 
value = instance.Keys

Property Value

This value of this property can be null (Nothing in Visual Basic).

The default value of this property is null.

Returns a collection of keys. Returns null reference if the collection has not been yet allocated.
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