'Declaration
 
<ExtensionAttribute()>
<NotNullAttribute()>
Public Overloads Shared Function ReadFunction( _
   ByVal dataVariable As UADataVariable, _
   ByVal valueType As Type, _
   ByVal readFunction As Func(Of UAAttributeData) _
) As UADataVariable

'Usage
 
Dim dataVariable As UADataVariable
Dim valueType As Type
Dim readFunction As Func(Of UAAttributeData)
Dim value As UADataVariable
 
value = UADataVariableExtension.ReadFunction(dataVariable, valueType, readFunction)

[Extension()]
[NotNull()]
public static UADataVariable ReadFunction( 
   UADataVariable dataVariable,
   Type valueType,
   Func<UAAttributeData> readFunction
)

[Extension()]
[NotNull()]
public:
static UADataVariable^ ReadFunction( 
   UADataVariable^ dataVariable,
   Type^ valueType,
   Func<UAAttributeData^>^ readFunction
) 

Parameters

dataVariable

The data variable that will be modified and returned.

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

valueType

The type of the data variable, expressed as .NET System.Type.

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

readFunction

The read function, i.e. the function that performs the read operation and returns the attribute data that will be returned to the caller of the OPC UA Read.

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

Return Value

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.

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.

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows