OPC Studio User's Guide and Reference
AsUnionDataType Method (_DataType)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.DataTypeModel.ComTypes Namespace > _DataType Interface : AsUnionDataType Method
The current data type expressed as union data type.
Syntax
'Declaration
 
<CanBeNullAttribute()>
Function AsUnionDataType() As UnionDataType
'Usage
 
Dim instance As _DataType
Dim value As UnionDataType
 
value = instance.AsUnionDataType()
[CanBeNull()]
UnionDataType AsUnionDataType()
[CanBeNull()]
UnionDataType^ AsUnionDataType(); 

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 data type is not a union data type.

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

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