OPC Studio User's Guide and Reference
OnRequestNullableChanged Method (AutomaticValueControl)



OpcLabs.BaseLibForms Assembly > OpcLabs.BaseLib.Forms Namespace > AutomaticValueControl Class : OnRequestNullableChanged Method
The old value of the property.
Called when the value of the RequestNullable property has changed.
Syntax
'Declaration
 

Protected Overrides NotOverridable Sub OnRequestNullableChanged( _
   ByVal oldValue As Boolean _
) 
'Usage
 

Dim instance As AutomaticValueControl
Dim oldValue As Boolean
 
instance.OnRequestNullableChanged(oldValue)
protected override void OnRequestNullableChanged( 
   bool oldValue
)
protected:
void OnRequestNullableChanged( 
   bool oldValue
) override

Parameters

oldValue
The old value of the property.
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

AutomaticValueControl Class
AutomaticValueControl Members
Base Implementation in OnRequestNullableChanged

 

 

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