CloudTableClient.BeginDoesTableExist Method
From Storage Client Library NET API
[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.
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 ) |
| J# |
|---|
| JScript |
|---|
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.
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.