public async Task <byte[]> GetBlobAsync(string containerName, string blobName)
{
try
{
CloudBlobContainer container = _blobClient.GetContainerReference(containerName);
ICloudBlob blob = container.GetBlobReferenceFromServer(blobName);
var target = new MemoryStream();
var futureRes = blob.BeginDownloadToStream(target, null, null);
return(await Task.Factory.FromAsync(futureRes, res =>
{
blob.EndDownloadToStream(res);
byte[] array = target.ToArray();
return array;
}));
}
catch (StorageException ex)
{
if (ex.RequestInformation.HttpStatusCode == 404)
{
return(null);
}
throw;
}
}
public void DownloadBlobAsync(ICloudBlob blob, string LocalFile)
{
// The class currently stores state in class level variables so calling UploadBlobAsync or DownloadBlobAsync a second time will cause problems.
// A better long term solution would be to better encapsulate the state, but the current solution works for the needs of my primary client.
// Throw an exception if UploadBlobAsync or DownloadBlobAsync has already been called.
lock (WorkingLock)
{
if (!Working)
{
Working = true;
}
else
{
throw new Exception("BlobTransfer already initiated. Create new BlobTransfer object to initiate a new file transfer.");
}
}
// Create an async op in order to raise the events back to the client on the correct thread.
asyncOp = AsyncOperationManager.CreateOperation(blob);
TransferType = TransferTypeEnum.Download;
m_Blob = blob;
m_FileName = LocalFile;
m_Blob.FetchAttributes();
FileStream fs = new FileStream(m_FileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read);
ProgressStream pstream = new ProgressStream(fs);
pstream.ProgressChanged += pstream_ProgressChanged;
pstream.SetLength(m_Blob.Properties.Length);
m_Blob.ServiceClient.DefaultRequestOptions.ParallelOperationThreadCount = 10;
asyncresult = m_Blob.BeginDownloadToStream(pstream, BlobTransferCompletedCallback, new BlobTransferAsyncState(m_Blob, pstream));
}
/// <summary>
/// Read a blob data into the given stream
/// </summary>
/// <returns>Return true on success, false if unable to create, throw exception on error</returns>
public async Task <bool> GetBlobAsync(string containerName, string blobName, Stream content)
{
try
{
BlobRequestOptions opt = new BlobRequestOptions {
MaximumExecutionTime = GetDataTimeout
};
CloudBlobContainer container = _blobClient.GetContainerReference(containerName);
ICloudBlob blob = container.GetBlobReferenceFromServer(blobName);
var futureRes = blob.BeginDownloadToStream(content, null, opt);
return(await Task.Factory.FromAsync(futureRes, res =>
{
blob.EndDownloadToStream(res);
return true;
}));
}
catch (StorageException ex)
{
if (ex.RequestInformation.HttpStatusCode == 404)
{
return(false);
}
throw;
}
}
public static string DownloadTextAPM(ICloudBlob blob, Encoding encoding, AccessCondition accessCondition = null, BlobRequestOptions options = null, OperationContext operationContext = null)
{
using (MemoryStream stream = new MemoryStream())
{
using (AutoResetEvent waitHandle = new AutoResetEvent(false))
{
IAsyncResult result = blob.BeginDownloadToStream(stream, accessCondition, options, operationContext, ar => waitHandle.Set(), null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
return(encoding.GetString(stream.ToArray()));
}
}
}
public static string DownloadTextAPM(ICloudBlob blob, Encoding encoding, AccessCondition accessCondition = null, BlobRequestOptions options = null, OperationContext operationContext = null)
{
using (MemoryStream stream = new MemoryStream())
{
using (AutoResetEvent waitHandle = new AutoResetEvent(false))
{
IAsyncResult result = blob.BeginDownloadToStream(stream, accessCondition, options, operationContext, ar => waitHandle.Set(), null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
return encoding.GetString(stream.ToArray());
}
}
}
public void DisableContentMD5ValidationTestAPM()
{
BlobRequestOptions optionsWithNoMD5 = new BlobRequestOptions()
{
DisableContentMD5Validation = true,
StoreBlobContentMD5 = true,
};
BlobRequestOptions optionsWithMD5 = new BlobRequestOptions()
{
DisableContentMD5Validation = false,
StoreBlobContentMD5 = true,
};
CloudBlobContainer container = GetRandomContainerReference();
try
{
container.Create();
using (AutoResetEvent waitHandle = new AutoResetEvent(false))
{
IAsyncResult result;
ICloudBlob blob = container.GetBlockBlobReference("blob1");
using (Stream stream = new NonSeekableMemoryStream())
{
blob.UploadFromStream(stream, null, optionsWithMD5);
}
using (Stream stream = new MemoryStream())
{
result = blob.BeginDownloadToStream(stream, null, optionsWithMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
result = blob.BeginDownloadToStream(stream, null, optionsWithNoMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
blob.Properties.ContentMD5 = "MDAwMDAwMDA=";
blob.SetProperties();
result = blob.BeginDownloadToStream(stream, null, optionsWithMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
TestHelper.ExpectedException(
() => blob.EndDownloadToStream(result),
"Downloading a blob with invalid MD5 should fail",
HttpStatusCode.OK);
result = blob.BeginDownloadToStream(stream, null, optionsWithNoMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
}
blob = container.GetPageBlobReference("blob2");
using (Stream stream = new MemoryStream())
{
blob.UploadFromStream(stream, null, optionsWithMD5);
}
using (Stream stream = new MemoryStream())
{
result = blob.BeginDownloadToStream(stream, null, optionsWithMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
result = blob.BeginDownloadToStream(stream, null, optionsWithNoMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
blob.Properties.ContentMD5 = "MDAwMDAwMDA=";
blob.SetProperties();
result = blob.BeginDownloadToStream(stream, null, optionsWithMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
TestHelper.ExpectedException(
() => blob.EndDownloadToStream(result),
"Downloading a blob with invalid MD5 should fail",
HttpStatusCode.OK);
result = blob.BeginDownloadToStream(stream, null, optionsWithNoMD5, null,
ar => waitHandle.Set(),
null);
waitHandle.WaitOne();
blob.EndDownloadToStream(result);
}
}
}
finally
{
container.DeleteIfExists();
}
}
public void DownloadBlobAsync(ICloudBlob blob, string LocalFile)
{
// The class currently stores state in class level variables so calling UploadBlobAsync or DownloadBlobAsync a second time will cause problems.
// A better long term solution would be to better encapsulate the state, but the current solution works for the needs of my primary client.
// Throw an exception if UploadBlobAsync or DownloadBlobAsync has already been called.
lock (WorkingLock)
{
if (!Working)
Working = true;
else
throw new Exception("BlobTransfer already initiated. Create new BlobTransfer object to initiate a new file transfer.");
}
// Create an async op in order to raise the events back to the client on the correct thread.
asyncOp = AsyncOperationManager.CreateOperation(blob);
TransferType = TransferTypeEnum.Download;
m_Blob = blob;
m_FileName = LocalFile;
m_Blob.FetchAttributes();
FileStream fs = new FileStream(m_FileName, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read);
ProgressStream pstream = new ProgressStream(fs);
pstream.ProgressChanged += pstream_ProgressChanged;
pstream.SetLength(m_Blob.Properties.Length);
m_Blob.ServiceClient.ParallelOperationThreadCount = 10;
asyncresult = m_Blob.BeginDownloadToStream(pstream, BlobTransferCompletedCallback, new BlobTransferAsyncState(m_Blob, pstream));
}
public Task DownloadToStreamAsync(Stream target)
{
return(Task.Factory.FromAsync(_blob.BeginDownloadToStream(target, null, null), _blob.EndDownloadToStream));
}
