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WorkflowQueue.RegisterForQueueItemAvailable Method (IActivityEventListener<QueueEventArgs>)

Registers a subscriber to the QueueItemAvailable event.

Namespace:  System.Workflow.Runtime
Assembly:  System.Workflow.Runtime (in System.Workflow.Runtime.dll)
public void RegisterForQueueItemAvailable(
	IActivityEventListener<QueueEventArgs> eventListener
)

Parameters

eventListener
Type: System.Workflow.ComponentModel.IActivityEventListener<QueueEventArgs>

A subscriber for QueueEventArgs that implements the IActivityEventListener<T> interface.

ExceptionCondition
ArgumentNullException

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

The following code example demonstrates how you can create a WorkflowQueue by calling the WorkflowQueuingService.GetWorkflowQueue method. It also uses the RegisterForQueueItemAvailable to register 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 Boolean DoSubscribe(ActivityExecutionContext context, IActivityEventListener<QueueEventArgs> listener)
{
    WorkflowQueue queue = CreateQueue(context);
    queue.RegisterForQueueItemAvailable(listener);

    FileWatcherService fileService = context.GetService<FileWatcherService>();
    this.subscriptionId = fileService.RegisterListener(this.QueueName, this.Path, this.Filter, this.NotifyFilter, this.IncludeSubdirectories);
    return (subscriptionId != Guid.Empty);
}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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