QuickOPC User's Guide and Reference
IsNull Property (_ResourceDescriptor)



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.ComTypes Namespace > _ResourceDescriptor Interface : IsNull Property
Determines whether the resource descriptor is null.
Syntax
'Declaration
 
ReadOnly Property IsNull As Boolean
'Usage
 
Dim instance As _ResourceDescriptor
Dim value As Boolean
 
value = instance.IsNull
bool IsNull {get;}
property bool IsNull {
   bool get();
}

Property Value

Returns true if this resource descriptor is null; otherwise, returns false.
Remarks
A resource descriptor is considered null when UrlString is empty.

This method or property does not throw any exceptions, aside from execution exceptions such as System.Threading.ThreadAbortException or System.OutOfMemoryException.

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