Azure Blobs: Get Block List in C#

Question

I am working with Block Blobs in Azure Storage. I need to get uncommitted blocks, as far as I have found I need to call "Get Block List". Here is the problem.

Does "Get Block List" functionality exists in C# (Microsoft.WindowsAzure.StorageClient.dll)?

MSDN only says about doing a HTTP request, not a word about StorageClient API.

If this function does not exists in C#, are there any plans to include it to the C# API?

Stuart · Accepted Answer · 2011-06-03 00:01:57Z

6

I think what you are looking for is the DownloadBlockList method on CloudBlockBlob http://msdn.microsoft.com/en-us/library/microsoft.windowsazure.storageclient.cloudblockblob.downloadblocklist.aspx

There's example code there in MSDN - http://msdn.microsoft.com/en-us/library/ee772860.aspx

static void DownloadBlockListForBlob(Uri blobEndpoint, string accountName, string accountKey)
{
    //Create service client for credentialed access to the Blob service, using development storage.
    CloudBlobClient blobClient = new CloudBlobClient(blobEndpoint, new StorageCredentialsAccountAndKey(accountName, accountKey)); 

    //Get a reference to a block blob.
    CloudBlockBlob blockBlob = blobClient.GetBlockBlobReference("mycontainer/mybinaryblob.mp3");

    //Download the committed blocks in the block list.
    foreach (var blockListItem in blockBlob.DownloadBlockList())
    {
        Console.WriteLine("Block ID: " + blockListItem.Name);
        Console.WriteLine("Block size: " + blockListItem.Size);
        Console.WriteLine("Is block committed?: " + blockListItem.Committed);
        Console.WriteLine();
    }

    //Download only uncommitted blocks.
    foreach (var blockListItem in blockBlob.DownloadBlockList(BlockListingFilter.Uncommitted))
    {
        Console.WriteLine("Block ID: " + blockListItem.Name);
        Console.WriteLine("Block size: " + blockListItem.Size);
        Console.WriteLine("Is block committed?: " + blockListItem.Committed);
        Console.WriteLine();
    }

    //Download all blocks.
    foreach (var blockListItem in blockBlob.DownloadBlockList(BlockListingFilter.All))
    {
        Console.WriteLine("Block ID: " + blockListItem.Name);
        Console.WriteLine("Block size: " + blockListItem.Size);
        Console.WriteLine("Is block committed?: " + blockListItem.Committed);
        Console.WriteLine();
    }
}

answered Jun 3, 2011 at 0:01

Stuart

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2 Comments

Peter Stegnar Over a year ago

Well this is it. I have already tryed this method, but without a filter option. It is strange that the empty method does not return all blocks ... This confused me and I thought that uncommited block are not returned via this method. Thanks, that you point that out!

pjgranahan Over a year ago

Your MSDN links are stale: "We're sorry, the page you requested cannot be found."

Gaurav Mantri · Accepted Answer · 2011-06-02 14:18:03Z

0

You may want to look into GetBlockListResponse class in Microsoft.WindowsAzure.StorageClient.Protocol namespace: http://msdn.microsoft.com/en-us/library/ee758632.aspx

Hope this helps

Thanks

Gaurav

answered Jun 2, 2011 at 14:18

Gaurav Mantri

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