/// <summary>
/// Basic operations to work with page blobs
/// </summary>
/// <returns>A Task object.</returns>
private static async Task BasicStoragePageBlobOperationsAsync()
{
const string PageBlobName = "samplepageblob";
string containerName = ContainerPrefix + Guid.NewGuid();
// Retrieve storage account information from connection string
CloudStorageAccount storageAccount = Cfg.GetAccount();
// Create a blob client for interacting with the blob service.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Create a container for organizing blobs within the storage account.
Console.WriteLine("1. Creating Container");
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
await container.CreateIfNotExistsAsync();
// Create a page blob in the newly created container.
Console.WriteLine("2. Creating Page Blob");
CloudPageBlob pageBlob = container.GetPageBlobReference(PageBlobName);
await pageBlob.CreateAsync(512 * 2 /*size*/); // size needs to be multiple of 512 bytes
// Write to a page blob
Console.WriteLine("2. Write to a Page Blob");
byte[] samplePagedata = new byte[512];
Random random = new Random();
random.NextBytes(samplePagedata);
await pageBlob.UploadFromByteArrayAsync(samplePagedata, 0, samplePagedata.Length);
// List all blobs in this container. Because a container can contain a large number of blobs the results
// are returned in segments with a maximum of 5000 blobs per segment. You can define a smaller maximum segment size
// using the maxResults parameter on ListBlobsSegmentedAsync.
Console.WriteLine("3. List Blobs in Container");
BlobContinuationToken token = null;
do
{
BlobResultSegment resultSegment = await container.ListBlobsSegmentedAsync(token);
token = resultSegment.ContinuationToken;
foreach (IListBlobItem blob in resultSegment.Results)
{
// Blob type will be CloudBlockBlob, CloudPageBlob or CloudBlobDirectory
Console.WriteLine("{0} (type: {1}", blob.Uri, blob.GetType());
}
}while (token != null);
// Read from a page blob
Console.WriteLine("4. Read from a Page Blob");
int bytesRead = await pageBlob.DownloadRangeToByteArrayAsync(samplePagedata, 0, 0, samplePagedata.Count());
// Clean up after the demo
Console.WriteLine("6. Delete page Blob");
await pageBlob.DeleteIfExistsAsync();
Console.WriteLine("7. Delete Container");
await container.DeleteIfExistsAsync();
}
public static async Task RunSamples()
{
Console.WriteLine("Azure Table Storage - Basic Samples\n");
Console.WriteLine();
string tableName = "demo" + Guid.NewGuid().ToString().Substring(0, 5);
// Create or reference an existing table
CloudTable table = await Cfg.CreateTableAsync(tableName);
try
{
// Demonstrate basic CRUD functionality
await BasicDataOperationsAsync(table);
// Create a SAS and try CRUD operations with the SAS.
await BasicDataOperationsWithSasAsync(table);
}
finally
{
// Delete the table
await table.DeleteIfExistsAsync();
}
}
/// <summary>
/// Basic operations to work with block blobs
/// </summary>
/// <returns>A Task object.</returns>
private static async Task BasicStorageBlockBlobOperationsAsync()
{
const string ImageToUpload = "Tiger.png";
string containerName = ContainerPrefix + Guid.NewGuid();
// Retrieve storage account information from connection string
CloudStorageAccount storageAccount = Cfg.GetAccount();
// Create a blob client for interacting with the blob service.
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
// Create a container for organizing blobs within the storage account.
Console.WriteLine("1. Creating Container");
CloudBlobContainer container = blobClient.GetContainerReference(containerName);
try
{
// The call below will fail if the sample is configured to use the storage emulator in the connection string, but
// the emulator is not running.
// Change the retry policy for this call so that if it fails, it fails quickly.
BlobRequestOptions requestOptions = new BlobRequestOptions()
{
RetryPolicy = new NoRetry()
};
await container.CreateIfNotExistsAsync(requestOptions, null);
}
catch (StorageException)
{
Console.WriteLine("If you are running with the default connection string, please make sure you have started the storage emulator. Press the Windows key and type Azure Storage to select and run it from the list of applications - then restart the sample.");
Console.ReadLine();
throw;
}
// To view the uploaded blob in a browser, you have two options. The first option is to use a Shared Access Signature (SAS) token to delegate
// access to the resource. See the documentation links at the top for more information on SAS. The second approach is to set permissions
// to allow public access to blobs in this container. Uncomment the line below to use this approach. Then you can view the image
// using: https://[InsertYourStorageAccountNameHere].blob.core.windows.net/democontainer/HelloWorld.png
// await container.SetPermissionsAsync(new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob });
// Upload a BlockBlob to the newly created container
Console.WriteLine("2. Uploading BlockBlob");
CloudBlockBlob blockBlob = container.GetBlockBlobReference(ImageToUpload);
// Set the blob's content type so that the browser knows to treat it as an image.
blockBlob.Properties.ContentType = "image/png";
await blockBlob.UploadFromFileAsync(ImageToUpload);
// List all the blobs in the container.
/// Note that the ListBlobs method is called synchronously, for the purposes of the sample. However, in a real-world
/// application using the async/await pattern, best practices recommend using asynchronous methods consistently.
Console.WriteLine("3. List Blobs in Container");
BlobResultSegment segment = await container.ListBlobsSegmentedAsync(null);
foreach (IListBlobItem blob in segment.Results)
{
// Blob type will be CloudBlockBlob, CloudPageBlob or CloudBlobDirectory
// Use blob.GetType() and cast to appropriate type to gain access to properties specific to each type
Console.WriteLine("- {0} (type: {1})", blob.Uri, blob.GetType());
}
// Download a blob to your file system
Console.WriteLine("4. Download Blob from {0}", blockBlob.Uri.AbsoluteUri);
await blockBlob.DownloadToFileAsync(string.Format("./CopyOf{0}", ImageToUpload), FileMode.Create);
// Create a read-only snapshot of the blob
Console.WriteLine("5. Create a read-only snapshot of the blob");
CloudBlockBlob blockBlobSnapshot = await blockBlob.CreateSnapshotAsync(null, null, null, null);
// Clean up after the demo. This line is not strictly necessary as the container is deleted in the next call.
// It is included for the purposes of the example.
Console.WriteLine("6. Delete block blob and all of its snapshots");
await blockBlob.DeleteIfExistsAsync(DeleteSnapshotsOption.IncludeSnapshots, null, null, null);
// Note that deleting the container also deletes any blobs in the container, and their snapshots.
// In the case of the sample, we delete the blob and its snapshots, and then the container,
// to show how to delete each kind of resource.
Console.WriteLine("7. Delete Container");
await container.DeleteIfExistsAsync();
}
