ASP.net connection with blob

Question

How do I create a connection between asp.net web app hosted on azure and Blob? The connection works perfectly when I upload files from my localhost to blob. But when i publish the web app on azure, the app is unable to store file in the blob. The only reason I can think why the file does not get uploaded is because of some sort of connection issue between the hosted asp.net web app and the blob

BlobStorageServices.cs

     public class BlobStorageServices
{
    public CloudBlobContainer GetCloudBlobContainer()
    {
        CloudStorageAccount storageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue("ImageStorageAccountConn"));
        CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
        CloudBlobContainer blobContainer = blobClient.GetContainerReference("myimages");
        if (blobContainer.CreateIfNotExists())
        {
            blobContainer.SetPermissions(new BlobContainerPermissions { PublicAccess = BlobContainerPublicAccessType.Blob });
        }
        return blobContainer;
    }
}

HomeController.cs

    BlobStorageServices _blobStorageService = new BlobStorageServices();
    [HttpPost]
    public ActionResult Upload(HttpPostedFileBase image)
    {
        if (image.ContentLength > 0)
        {
            CloudBlobContainer blobContainer = _blobStorageService.GetCloudBlobContainer();
            CloudBlockBlob blob = blobContainer.GetBlockBlobReference(image.FileName);
            blob.UploadFromStream(image.InputStream);
        }
        return RedirectToAction("Index");
    }

Index.cshtml

    <h2>Upload Image</h2>
    <p>
    @using (Html.BeginForm("Upload", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
    {
        <input type="file" name="image" />
        <input type="submit" value="Upload" />
    }
    </p>

Not sure if the BlobStorageServices.cs file gets uploaded to azure when we publish the asp.net app via visual studio. ImageStorageAccountConn is the connecting string.

Is this running in a web/worker role instance? Or VM? Or Web App (app service)? You mentioned web app, but you have a call to RoleEnvironment — David Makogon
– David Makogon, Commented Apr 11, 2017 at 20:55
Thanks David. I removed RoleEnvironment and it works now. I was struggling with this since last 2 days. :/ — Chetan
– Chetan, Commented Apr 11, 2017 at 21:03

David Makogon · Accepted Answer · 2017-04-11 20:57:16Z

1

Assuming you're actually using Web App (per your question): You are attempting to use the RoleEnvironment object to get the connection string. RoleEnvironment is specific to classic Cloud Services (web/worker role instances).

answered Apr 11, 2017 at 20:57

David Makogon

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