OPC Studio User's Guide and Reference
AsUnionData Method (GenericDataExtension)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.DataTypeModel.Extensions Namespace > GenericDataExtension Class : AsUnionData Method

The value of this parameter cannot be null (Nothing in Visual Basic).

The current generic data expressed as data of union data type.
Syntax
'Declaration
 
<ExtensionAttribute()>
<CanBeNullAttribute()>
Public Shared Function AsUnionData( _
   ByVal genericData As GenericData _
) As UnionData
'Usage
 
Dim genericData As GenericData
Dim value As UnionData
 
value = GenericDataExtension.AsUnionData(genericData)
[Extension()]
[CanBeNull()]
public static UnionData AsUnionData( 
   GenericData genericData
)
[Extension()]
[CanBeNull()]
public:
static UnionData^ AsUnionData( 
   GenericData^ genericData
) 

Parameters

genericData

The value of this parameter cannot be null (Nothing in Visual Basic).

Return Value

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

Remarks

Returns null if the current generic data is not of union 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