Creates the container if it does not already exist, 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 returnValue As Boolean returnValue = instance.CreateIfNotExist(options) |
Syntax
| Visual Basic |
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Public Function CreateIfNotExist ( _ options As BlobRequestOptions _ ) As Boolean |
| C# |
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public bool CreateIfNotExist ( BlobRequestOptions options ) |
| C++ |
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public: bool CreateIfNotExist ( BlobRequestOptions^ options ) |
| 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.
Return Value
Type: System.Booleantrue if the container did not already exist and was created; otherwise false.
Example
The following code example creates a container if it does not exist.
| C# | Copy Code |
|---|---|
static void UploadBlobFromFile(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 to a container, which may or may not exist.
CloudBlobContainer container = blobClient.GetContainerReference("mycontainer");
//Create a new container, if it does not exist
container.CreateIfNotExist();
//Get a reference to a blob, which may or may not exist.
CloudBlob blob = container.GetBlobReference("myfile.txt");
//Upload content to the blob, which will create the blob if it does not already exist.
blob.UploadFile("c:\\myfile.txt");
}
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Remarks
Containers are created immediately 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 CreateIfNotExist writes the metadata to the new container, so it's not necessary to also call SetMetadata.
The CreateIfNotExist method throws a StorageClientException if the specified container already exists. The error code returned by the service is ContainerAlreadyExists.
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.