Begins an asynchronous operation to create a container, using a conditional request based on the BlobRequestOptions that you specify. Namespace: Microsoft.WindowsAzure.StorageClient
Assembly: Microsoft.WindowsAzure.StorageClient (in Microsoft.WindowsAzure.StorageClient.dll)
Usage
| Visual Basic |
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Dim instance As CloudBlobContainer Dim options As BlobRequestOptions Dim callback As AsyncCallback Dim state As Object Dim returnValue As IAsyncResult returnValue = instance.BeginCreate(options, callback, state) |
Syntax
| Visual Basic |
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Public Function BeginCreate ( _ options As BlobRequestOptions, _ callback As AsyncCallback, _ state As Object _ ) As IAsyncResult |
| C# |
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public IAsyncResult BeginCreate ( BlobRequestOptions options, AsyncCallback callback, Object state ) |
| C++ |
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public: IAsyncResult^ BeginCreate ( BlobRequestOptions^ options, AsyncCallback^ callback, Object^ state ) |
| J# |
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| JScript |
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Parameters
- options
Type: Microsoft.WindowsAzure.StorageClient.BlobRequestOptions
An object that specifies any additional options for the request.
- 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 creates a new container and defines metadata for it, and handles the error in case a container with the same name already exists.
| C# | Copy Code |
|---|---|
static void CreateContainerAsync(Uri blobEndpoint, string accountName, string accountKey)
{
//Create service client for credentialed access to the Blob service.
CloudBlobClient blobClient =
new CloudBlobClient(blobEndpoint, new StorageCredentialsAccountAndKey(accountName, accountKey));
//Get a reference for the new container.
CloudBlobContainer container = blobClient.GetContainerReference("newcontainer");
//Define metadata for the container.
container.Metadata["media"] = "video";
//Begin the operation to create the container.
container.BeginCreate(CreateContainerCallback, container);
}
static void CreateContainerCallback(IAsyncResult result)
{
CloudBlobContainer container = (CloudBlobContainer)result.AsyncState;
//End the operation. Handle the error in case the container already exists.
try
{
container.EndCreate(result);
Console.WriteLine("Container " + container.Name + " created successfully.");
}
catch (StorageClientException e)
{
if (e.ErrorCode == StorageErrorCode.ContainerAlreadyExists)
{
Console.WriteLine("Cannot create the container because it already exists.");
}
else
{
Console.WriteLine(e.ErrorCode);
}
}
}
| |
Remarks
Containers are created directly beneath the storage account. It's not possible to nest one container beneath another.
You can specify metadata on the container at the time that you created it. In this case, the call to BeginCreate writes the metadata to the new container, so it's not necessary to also call SetMetadata.
The BeginCreate method throws a StorageClientException if the specified container already exists. The error code returned by the service is ContainerAlreadyExists. If a container with the same name is still being deleted, the service returns error code ContainerBeingDeleted. If you specify a container with upper-case characters in its name, the method throws a StorageClientException.
You can optionally create a default or root container for your storage account. The root container may be inferred from a URL requesting a blob resource. The root container makes it possible to reference a blob from the top level of the storage account hierarchy, without referencing the container name. To add the root container to your storage account, create a container named $root.