QuickOPC User's Guide and Reference
MessageChanged Property (EasyAENotificationEventArgs)



OpcLabs.EasyOpcClassicCore Assembly > OpcLabs.EasyOpc.AlarmsAndEvents.OperationModel Namespace > EasyAENotificationEventArgs Class : MessageChanged Property
Indicates to the application that the Message of the condition has changed.
Syntax
'Declaration
 
<DefaultValueAttribute(False)>
Public Property MessageChanged As Boolean
'Usage
 
Dim instance As EasyAENotificationEventArgs
Dim value As Boolean
 
instance.MessageChanged = value
 
value = instance.MessageChanged
[DefaultValue(false)]
public bool MessageChanged {get; set;}
[DefaultValue(false)]
public:
property bool MessageChanged {
   bool get();
   void set (    bool value);
}
Remarks

This property is used only for Condition-Related Events (see EventType).

If the event notification is the result of a Refresh, the value of this property should be ignored.

It is server-specific whether this property will be True for a "new event". (A "new event" is any event resulting from the related condition leaving the Inactive and Acknowledged state.)

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