[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
| Visual Basic |
|---|
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) |
Syntax
| Visual Basic |
|---|
Public Function BeginDoesTableExist ( _
tableName As String, _
callback As AsyncCallback, _
state As Object _
) As IAsyncResult |
| C# |
|---|
public IAsyncResult BeginDoesTableExist (
string tableName,
AsyncCallback callback,
Object state
) |
| C++ |
|---|
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.IAsyncResultAn
IAsyncResult that references the asynchronous operation.
Example
The following code example checks whether a table exists asynchronously.
| C# |  Copy Code |
|---|
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.");
}
}
|
Thread Safety
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Platforms
Change History
See Also
