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CloudTableClient.BeginDoesTableExist Method

Updated: April 24, 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 determine whether a table exists.

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

'Usage
Dim instance As CloudTableClient
Dim tableName As String
Dim callback As AsyncCallback
Dim state As Object
Dim returnValue As IAsyncResult

returnValue = instance.BeginDoesTableExist(tableName, callback, state)

public IAsyncResult BeginDoesTableExist (
	string tableName,
	AsyncCallback callback,
	Object state
)

Parameters

tableName

Type: System.String

The table name.

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 checks whether a table exists asynchronously.

public static void CheckTableExistenceAsync(CloudStorageAccount storageAccount)
{
    // Create service client for credentialed access to the Table service.
    CloudTableClient tableClient = 
         new CloudTableClient(
             storageAccount.TableEndpoint.ToString(),
             storageAccount.Credentials);

    tableClient.BeginDoesTableExist(
      "Products", CheckTableExistenceAsyncCallback, tableClient);
}

public static void CheckTableExistenceAsyncCallback(IAsyncResult result)
{
    CloudTableClient tableClient = (CloudTableClient)result.AsyncState;

    if (tableClient.EndDoesTableExist(result))
    {
        Console.WriteLine("Table exists.");
    }
    else
    {
        Console.WriteLine("Table does not exist.");
    }
}


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

 

Reference

CloudTableClient Class
CloudTableClient Members
Microsoft.WindowsAzure.StorageClient Namespace

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