TimerEventSubscriptionCollection.Add Method (TimerEventSubscription)


Adds a TimerEventSubscription to the timer queue.

Namespace:   System.Workflow.Runtime
Assembly:  System.Workflow.Runtime (in System.Workflow.Runtime.dll)

public void Add(
	TimerEventSubscription item


Type: System.Workflow.Runtime.TimerEventSubscription

The TimerEventSubscription to add to the timer queue.

Exception Condition

item is a null reference (Nothing in Visual Basic).

Adds the TimerEventSubscription to the timer queue. Subscriptions in the queue are positioned based on their TimerEventSubscription.ExpiresAt values; those with smaller values are positioned in front of those with larger values. If the new subscription is added at the beginning of the queue, WorkflowSchedulerService.Cancel is called to cancel the timer event that was previously at the beginning of the queue and WorkflowSchedulerService.Schedule(WaitCallback, Guid, DateTime, Guid) is called to schedule the new timer event. Add locks the TimerEventSubscriptionCollection before adding the new subscription and is, therefore, thread safe.

.NET Framework
Available since 3.0
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