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



OpcLabs.BaseLib Assembly > OpcLabs.BaseLib.OperationModel.ComTypes Namespace > _OperationEventArgs Interface : Exception Property
Gets the current exception. Contains null reference when no exception.
Syntax
'Declaration
 
<CanBeNullAttribute()>
Property Exception As Exception
'Usage
 
Dim instance As _OperationEventArgs
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);
}

Property Value

This value of this property can be null (Nothing in Visual Basic).

The default value of this property is null.

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 Succeeded property.

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

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

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

This member or type is for use from COM. It is not meant to be used from .NET or Python. Refer to the corresponding .NET member or type instead, if you are developing in .NET or Python.

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