OPC Studio User's Guide and Reference
IsNull Property (EventSource)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.ComponentModel.Referencing Namespace > EventSource Class : IsNull Property
Determines whether this event source object is null.
Syntax
'Declaration
 

<BrowsableAttribute(False)>
Public ReadOnly Property IsNull As Boolean
'Usage
 

Dim instance As EventSource
Dim value As Boolean
 
value = instance.IsNull
[Browsable(false)]
public bool IsNull {get;}
[Browsable(false)]
public:
property bool IsNull {
   bool get();
}

Property Value

The default value of this property is True.

Remarks
The event source is null when its source component and extender event provider are null, and the source path is empty.
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

EventSource Class
EventSource Members

 

 

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