QuickOPC User's Guide and Reference
OnRequestNullableChanged Method (UserValueControl)



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

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

Dim instance As UserValueControl
Dim oldValue As Boolean
 
instance.OnRequestNullableChanged(oldValue)
protected virtual void OnRequestNullableChanged( 
   bool oldValue
)
protected:
virtual void OnRequestNullableChanged( 
   bool oldValue
)

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

UserValueControl Class
UserValueControl Members

 

 

Copyright © 2004-2023 CODE Consulting and Development, s.r.o., Plzen. All rights reserved. Web page: www.opclabs.com

Send Documentation Feedback. Resources: Knowledge Base. Technical support: Online Forums, FAQ.