I have a SharePoint app with a custom action. With this custom action I want to upload the selected file in the SharePoint document library to a container in the azure blob storage.

How can I upload the file to azure?

I've tried sending the url of the file to a page on the host web and put the file in a stream using the url but I get an error 401 unauthorized.

1 Answer 1


Once You have the file stream, you can use the below code to upload file to blob storage.

string azureConnString = "YourAzureStorageConnStringName";
    CloudBlobClient blobClient;
    CloudStorageAccount storageAccount;
    CloudBlobContainer container;
    CloudBlockBlob blockBlob;
    public bool AddFileToBlob(System.IO.Stream stream, string fileName, string containerName)
        byte[] bytesarr =  GetByteFromStream(stream); //Convert the stream to byte array

        using (MemoryStream memoryStrem = new MemoryStream(bytesarr))

            // Retrieve storage account from connection string.
            storageAccount = CloudStorageAccount.Parse(

            // Create the blob client.
            blobClient = storageAccount.CreateCloudBlobClient();

            // Retrieve reference to a previously created container.
            container = blobClient.GetContainerReference(containerName);

            // Retrieve reference to a blob named "myblob".
            blockBlob = container.GetBlockBlobReference(fileName);
            if (!blockBlob.Exists())

            return true;
  • Maybe I didn't formulate my question right. I know about that part. The problem is getting the file from sharepoint into a stream.
    – Marijn
    Commented Dec 6, 2013 at 13:58
  • Can you please post your code that is giving you unauthorized error? Are you using a high trust provider hosted app ? Commented Dec 9, 2013 at 6:13

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