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CloudQueue.BeginDelete Method

Updated: September 27, 2013

[This topic is part of the Microsoft Azure Storage Client Library 1.7, which has been deprecated. See Storage Client Library for the latest version.]

Begins an asynchronous operation to delete the queue.

Namespace: Microsoft.WindowsAzure.StorageClient
Assembly: Microsoft.WindowsAzure.StorageClient (in Microsoft.WindowsAzure.StorageClient.dll)

'Usage
Dim instance As CloudQueue
Dim callback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginDelete(callback, state)

'Declaration
Public Function BeginDelete ( _
	callback As AsyncCallback, _
	state As Object _
) As IAsyncResult

Parameters

callback

Type: System.AsyncCallback

The callback delegate that will receive notification when the asynchronous operation completes.

state

Type: System.Object

A user-defined object that will be passed to the callback delegate.

Return Value

Type: System.IAsyncResult

An IAsyncResult that references the asynchronous operation.

The following code example illustrates using state when calling BeginDelete.

using System;
using System.Diagnostics;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.StorageClient;

namespace QueueAsyncExample
{
  public class QueueAsyncStateExample
  {
    public CloudQueue queueObject;
    public object customStateInformation;

    // Constructor for the example state class
    public QueueAsyncStateExample( CloudQueue queue, object yourAdditionalStateObject )
    {
      this.queueObject = queue;
      this.customStateInformation = yourAdditionalStateObject;
    }

    // Static call that starts deleting a queue
    static void DeleteQueueAsync( CloudQueue queue, object stateObject )
    {
      queue.BeginDelete( QueueDeleteCallback,
                         new QueueAsyncStateExample( queue, stateObject ) );
    }

    // The callback method that is called once the create-if-not-exist operation is complete
    static void QueueDeleteCallback( IAsyncResult opResult )
    {
      QueueAsyncStateExample state = (QueueAsyncStateExample) opResult.AsyncState;
      CloudQueue queue = state.queueObject;
      // End the BeginDelete operation
      queue.EndDelete( opResult );
      // ...other asynchronous operations could be started here if appropriate
    }
  }
}

Note that when you delete a queue, there may be an interval of time of at least 35 seconds during which you cannot create a queue with the same name.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

Windows Vista, Windows 7, Windows Server 2008, Windows 8.1, Windows Server 2012 R2, Windows 8 and Windows Server 2012

 

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