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



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

Property Value

The default value of this property is True.

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.

The getter method of this property is pure, i.e. it does not have observable side effects.

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