OPC Studio User's Guide and Reference
ReadFunction Method



OpcLabs.ServerOpcUA Assembly > OpcLabs.EasyOpc.UA.NodeSpace Namespace > UADataVariableExtension Class : ReadFunction Method
Modifies the data variable to provide attribute data for the pull data provision model by a specified function.

This method always makes the data variable readable, but that does not mean it automatically makes it non-writable. If you need a data variable that is readable and non-writable, combine this method with calling Writable(UADataVariable,Boolean) method with the 'writable' parameter set to false.

Overload List
OverloadDescription
ReadFunction(UADataVariable,Type,Func<UAAttributeData>)Specifies value type, and read function returning attribute data, for the pull data provision model.  
ReadFunction(UADataVariable,TypeCode,Func<UAAttributeData>)Specifies value type code, and read function returning attribute data, for the pull data provision model.  
ReadFunction(UADataVariable,UANodeId,Func<UAAttributeData>)Specifies the data type Id, and read function returning attribute data, for the pull data provision model. Uses an empty array dimension list.  
ReadFunction(UADataVariable,UANodeId,Int32,Func<UAAttributeData>)Specifies the data type Id, array rank, and read function returning attribute data, for the pull data provision model.  
ReadFunction(UADataVariable,UANodeId,IReadOnlyList<Int32>,Func<UAAttributeData>)Specifies the data type Id, array dimension list, and read function returning attribute data, for the pull data provision model.  
ReadFunction<TValue>(UADataVariable,Func<UAAttributeData<TValue>>)Specifies read function returning typed attribute data, for the pull data provision model.  
ReadFunction<TValue>(UADataVariable,Func<UAAttributeData<TValue>>,Int32[])Specifies read function returning typed attribute data, and array dimensions, for the pull data provision model.  
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

Reference

UADataVariableExtension Class
UADataVariableExtension Members

 

 

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