- Manuale introduttivo
- Utilizzo del software
- OPC UA
- Oggetti grafici e di layout
- Sessioni e impostazioni locali
- Sviluppo di soluzioni
- Sviluppo di progetti con C#
- NetLogic
- Metodi ed eventi in C#
- Riferimento API C#
- Esempi di applicazione
- Esercitazione dell'interfaccia utente
- Esercitazione sui collegamenti dinamici
- Esercitazione sui logger
- Esercitazione sugli allarmi
- Esercitazione sulle NetLogic
- Riferimento su oggetti e variabili
Cancel a task
A task can be canceled at runtime. You cannot run a cancelled task.
Making a task cancellable
You can cancel a task if the value returned from reading its
IsCancellationRequested
property is appropriately managed in the method that executes, usually using conditional instructions.The
IsCancellationRequested
property can have the following values:
- false
- Cancellation not requested.
- true
- Cancellation requested.
To use the property within the method, indicate the task as the argument of the same method, specifying its type.
In the following example,
myTask
is a task and ProcessCsvFile()
is the method that executes:
private void ProcessCsvFile(LongRunningTask myTask) { // Code to execute }
For a complete example, see Constructor: LongRunningTask(action, executingNode).
Cancel a task
You cancel a task by invoking the
Cancel()
method on the task. See the following example.
myTask.Cancel();
The method sets the value of the task
IsCancellationRequested
property to True
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