This topic has not yet been rated - Rate this topic

WorkflowQueue.UnregisterForQueueItemAvailable Method

.NET Framework 3.0

Unregisters a subscriber to the QueueItemAvailable event.

Namespace: System.Workflow.Runtime
Assembly: System.Workflow.Runtime (in system.workflow.runtime.dll)

public void UnregisterForQueueItemAvailable (
	IActivityEventListener<QueueEventArgs> eventListener
)

public void UnregisterForQueueItemAvailable (
	IActivityEventListener<QueueEventArgs> eventListener
)

JScript

public function UnregisterForQueueItemAvailable (
	eventListener : IActivityEventListener<QueueEventArgs>
)

XAML

Not applicable.

Parameters

eventListener: A subscriber for QueueEventArgs that implements the IActivityEventListener interface.

Exceptions

Exception type	Condition
ArgumentNullException	eventListener is a null reference (Nothing in Visual Basic).

Example

The following code example demonstrates how you can create a WorkflowQueue by calling the WorkflowQueuingService.GetWorkflowQueue method. It also uses the UnregisterForQueueItemAvailable to unregister the specified listener.

This code example is part of the File Watcher Activity SDK Sample from the FileSystemEvent.cs file. For more information, see File System Watcher Activity.

private void DoUnsubscribe(ActivityExecutionContext context, IActivityEventListener<QueueEventArgs> listener)
{
    if (!this.subscriptionId.Equals(Guid.Empty))
    {
        FileWatcherService fileService = context.GetService<FileWatcherService>();
        fileService.UnregisterListener(this.subscriptionId);
        this.subscriptionId = Guid.Empty;
    }

    WorkflowQueuingService qService = context.GetService<WorkflowQueuingService>();
    WorkflowQueue queue = qService.GetWorkflowQueue(this.QueueName);

    queue.UnregisterForQueueItemAvailable(listener);
}

Platforms

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0

Reference

WorkflowQueue Class
WorkflowQueue Members
System.Workflow.Runtime Namespace

Other Resources

File System Watcher Activity

Did you find this helpful? Yes No

Not accurate

Not enough depth

Need more code examples

(1500 characters remaining)

Community Additions

ADD