OPC Studio User's Guide and Reference
Exception Property (_EasyUADataChangeNotificationEventArgs)



OpcLabs.EasyOpcUA Assembly > OpcLabs.EasyOpc.UA.OperationModel.ComTypes Namespace > _EasyUADataChangeNotificationEventArgs Interface : Exception Property
Gets the current exception. Contains null reference when no exception.
Syntax
'Declaration
 
<CanBeNullAttribute()>
Property Exception As Exception
'Usage
 
Dim instance As _EasyUADataChangeNotificationEventArgs
Dim value As Exception
 
instance.Exception = value
 
value = instance.Exception
[CanBeNull()]
Exception Exception {get; set;}
[CanBeNull()]
property Exception^ Exception {
   Exception^ get();
   void set (    Exception^ value);
}
Remarks

Your application code should check the Exception first, before accessing the operation data properties.

If you only need to test that the operation has succeeded, you can also use the OpcLabs.BaseLib.OperationModel.OperationEventArgs.Succeeded property.

This property is not serialized into XML. Instead, OpcLabs.BaseLib.OperationModel.OperationEventArgs.ErrorMessage is serialized. Deserializing from XML creates a base OpcLabs.BaseLib.OperationModel.OperationEventArgs.Exception object with just the message.

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