C# Azure storage from one blob copy file to another blob - azure

Question

How can I read a file to stream from one blob and upload to another blob? My requirement is to copy a file from one blob to another blob with different file name? In C#

Answer 1

The easiest way to achieve it is using "Azure Storage Data Movement Library" (you can get it thru nuget package).
This is a simple-sample to make the transfer:
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using Microsoft.WindowsAzure.Storage.DataMovement;
using System;
namespace BlobClient
{
class Program
{
static void Main(string[] args)
{
const string storageConnectionString = "DefaultEndpointsProtocol=https;AccountName=juanktest;AccountKey=loHQwke4lSEu1p2W3gg==";
const string container1 = "juankcontainer";
const string sourceBlobName = "test.txt";
const string destBlobName = "newTest.txt";
//Setup Account, blobclient and blobs
CloudStorageAccount account = CloudStorageAccount.Parse(storageConnectionString);
CloudBlobClient blobClient = account.CreateCloudBlobClient();
CloudBlobContainer blobContainer = blobClient.GetContainerReference(container1);
blobContainer.CreateIfNotExists();
CloudBlockBlob sourceBlob = blobContainer.GetBlockBlobReference(sourceBlobName);
CloudBlockBlob destinationBlob = blobContainer.GetBlockBlobReference(destBlobName);
//Setup data transfer
TransferContext context = new TransferContext();
Progress<TransferProgress> progress = new Progress<TransferProgress>(
(transferProgress) => {
Console.WriteLine("Bytes uploaded: {0}", transferProgress.BytesTransferred);
});
context.ProgressHandler = progress;
// Start the transfer
try
{
TransferManager.CopyAsync(sourceBlob, destinationBlob,
false /* isServiceCopy */,
null /* options */, context);
}
catch (Exception e)
{
Console.WriteLine("The transfer is cancelled: {0}", e.Message);
}
Console.WriteLine("CloudBlob {0} is copied to {1} ====successfully====",
sourceBlob.Uri.ToString(),
destinationBlob.Uri.ToString());
Console.ReadLine();
}
}
}
Note that "Azure Storage Data Movement Library" is very robust so you can track the transfer progress, cancel the operation or even suspend it to resume it later ;)

Answer 2

One of the easiest ways to copy files is with the AzCopy utility.

Answer 3

I would like to recommend another method other than the above to get this done.
That is azure functions. (serverless compute service).
As a prerequisite, you should have some knowledge in azure functions, creating them, deploying them. 1. What is azure function 2. create an Azure function app
And the following code snippet is the simplest and basic way to perform this action. (In here, when a user uploading a new file to the "demo" blob, the function will be triggered and read that uploaded file from the demo blob and copy to the "output" blob.)
namespace Company.Function{
public static class NamalFirstBlobTrigger
{
[FunctionName("NamalFirstBlobTrigger")]
public static void Run([BlobTrigger("demo/{name}", Connection = "AzureWebJobsStorage")]Stream myBlob,
[Blob("output/testing.cs",FileAccess.Write, Connection = "AzureWebJobsStorage")]Stream outputBlob,
string name,
ILogger log)
{
myBlob.CopyTo(outputBlob);
}
}}