file download from blob

Question

Hi,

Below code is for donwnloading file from azure blob. I have problem with .docx,.xlsx files and that too after deployment only, mean in local machine it is working fine.

The problem is after downloading .xlsx or .docx, when i open that file showing file corrupted popup.

Please help me some one.

public void DownloadBlob(string blobName) { 
string accountName = "MyAccName";
 string accountPrimaryKey = "MyKey"; 
string blobContainer = "ContainerName"; 
CloudStorageAccount account = new CloudStorageAccount(new StorageCredentialsAccountAndKey(accountName, accountPrimaryKey), false);
 CloudBlobClient blobClient = account.CreateCloudBlobClient();
 CloudBlobContainer container = blobClient.GetContainerReference(blobContainer); CloudBlob blob = container.GetBlobReference(blobName); 

MemoryStream memStream = new MemoryStream(); 

blob.DownloadToStream(memStream);

        Response.ContentType = blob.Properties.ContentType;
        Response.AddHeader("Content-Disposition", "Attachment; filename=" + blobName.ToString());
        Response.AddHeader("Content-Length", (blob.Properties.Length - 1).ToString());
        Response.BinaryWrite(memStream.ToArray());
        Response.End();
    }

Answer 1

Hi Srinath,

I have moved this thread to a dedicated forum for better support.

Best regards,

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Mike Feng
MSDN Community Support | Feedback to us
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 2

This has been asked over on StackOverflow too, but it looks like the user has abandoned it: http://stackoverflow.com/questions/10497449/file-download-from-azure-blob

No sense answering here.

Answer 3

Hello,

According to your description, you mentioned that "I have problem with .docx,.xlsx files and that too after deployment only, mean in local machine it is working fine." Is that mean the .docx and .xlsx files can be downloaded success in storage emulator (local SQL Server databse), but now works in Cloud Storage? or works fine at local machine with cloud Storage but not in cloud environment with cloud storage? And i suggest you provide more details about your exception message, such as Stack message or tracing logs.

And please following Steve's suggestion check "blob.Properties.Length - 1" in HttpRequest Header.

Here is the difference between Azure Cloud Storage and Azure Storage Emulator:

http://msdn.microsoft.com/en-us/library/windowsazure/gg433135.aspx

And i saw your blob container name is "ContainerName". is this a true container name or repalcer, if it's a ture container name will cause errors, Blob container name must be lowercase.

http://msdn.microsoft.com/en-us/library/windowsazure/dd135715.aspx

Hope this helps.

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Answer 4

@Arwind, Thanks for your support, I followed steve marx instructions then it is fixed