OPC Studio User's Guide and Reference
AsEnumerationData Method (_UnionData)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.DataTypeModel.ComTypes Namespace > _UnionData Interface : AsEnumerationData Method
The current generic data expressed as data of enumeration data type.
Syntax
'Declaration
 
<CanBeNullAttribute()>
Function AsEnumerationData() As EnumerationData
'Usage
 
Dim instance As _UnionData
Dim value As EnumerationData
 
value = instance.AsEnumerationData()
[CanBeNull()]
EnumerationData AsEnumerationData()
[CanBeNull()]
EnumerationData^ AsEnumerationData(); 

Return Value

This method can return null (Nothing in Visual Basic).

Remarks

This member or type is for use from COM. It is not meant to be used from .NET or Python. Refer to the corresponding .NET member or type instead, if you are developing in .NET or Python.

Returns null if the current generic data is not of enumeration data type.

This method has been introduced primarily for languages like PHP that do not allow down-casting.

Classes derived from OpcLabs.BaseLib.DataTypeModel.GenericData form following class hierarchy:

.

This is an extension method (info: C#, VB.NET). In languages that have support for extensions methods (such as C# and VB.NET), you can use the extension method as if it were a regular method on the object that is its first parameter. In other languages (such as with Python.NET), you will call the extension as a static method, and pass it the object on which it acts as its first parameter.

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