Azure Blob Storage

Install nuget pakages

1. WindowsAzure.Storage
2. Microsoft.WindowsAzure.ConfigurationManager

here is the extract from packages.config

<packages>
  <package id="Microsoft.WindowsAzure.ConfigurationManager" 

           version="3.2.3" targetFramework="net40" />
  <package id="WindowsAzure.Storage" 

           version="8.1.1" targetFramework="net40" />
</packages>

web.config

<add key="storage:account:name" value="d8view"/>
<add key="storage:account:key" value="7o1-----A=="/>
<add key="storage:account:connection" value="DefaultEndpointsProtocol=https;AccountName=d8view;AccountKey=7o1-----==" />
<add key="storage:account:PDFContainer" value="patients"/>

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

declare the CloudBlobClient!

 CloudBlobClient blobClient;

 public constructor()
 {
            // Retrieve storage account from connection string.
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
            ConfigurationManager.AppSettings["storage:account:connection"]);
            // Create the blob client.
            blobClient = storageAccount.CreateCloudBlobClient();
 }

Retrive the blob with policy url

public string GetAzureBlobReference(string strContainer, string prefix)
        {
            // Retrieve reference to a previously created container.
            CloudBlobContainer container 
                               = blobClient.GetContainerReference(strContainer);
            var readPolicy = new SharedAccessBlobPolicy()
            {
                Permissions = SharedAccessBlobPermissions.Read,
                SharedAccessExpiryTime = DateTime.UtcNow + TimeSpan.FromMinutes(5)
            };
            var docref = container.GetBlobReference(prefix);
            return  docref.Uri.AbsoluteUri 
                    + docref.GetSharedAccessSignature(readPolicy) };
        }

download as byte[]

//download document templete from Azurebolb
 public byte[] DownloadTemplate(string templateName)
 {
     byte[] templateInByteArray;
     try
     {
         //string containerName = "template";
         string fileName = templateName;
 
         var accountName = ConfigurationManager.AppSettings["storage:account:name"];
         var accountKey = ConfigurationManager.AppSettings["storage:account:key"];
         var containerName = ConfigurationManager.AppSettings["storage:WordTemplate:Location"];
 
         var storageAccount = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
         CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
 
         // Retrieve reference to a previously created container.
         CloudBlobContainer container = blobClient.GetContainerReference(containerName);
 
         // Retrieve reference to a blob
         CloudBlockBlob blockBlob = container.GetBlockBlobReference(fileName);
 
         using (MemoryStream ms = new MemoryStream())
         {
             blockBlob.DownloadToStream(ms);
             templateInByteArray = ms.ToArray();
         }
     }
     return templateInByteArray;
 }

upload blob

//update generated pdf Azurebolb
        public bool UploadPDFToAzureBlob(byte[] pdf, string fileName)
        {
            try
            {
                //string containerName = "generatedpdf";
 
                var accountName = ConfigurationManager.AppSettings["storage:account:name"];
                var accountKey = ConfigurationManager.AppSettings["storage:account:key"];
                var containerName = ConfigurationManager.AppSettings["storage:PDFExport:Location"];
 
                var storageAccount = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
 
                CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
 
                CloudBlobContainer container = blobClient.GetContainerReference(containerName);
 
 
                // Retrieve reference to a blob named "myblob".
                CloudBlockBlob blockBlob = container.GetBlockBlobReference(fileName);
                blockBlob.Properties.ContentType = "application/pdf";
                // Create or overwrite the "myblob" blob with contents from a local file.
                using (var stream = new MemoryStream(pdf, writable: false))
                {
                    blockBlob.UploadFromStream(stream);
                }
            }

            return true;
        }

Delete blob

var accountName = ConfigurationManager.AppSettings["storage:account:name"];
var accountKey = ConfigurationManager.AppSettings["storage:account:key"];
var containerName = ConfigurationManager.AppSettings["storage:PDFExport:Location"];
 
var storageAccount = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
var deleteFolderPath = patientId+"/"+"Episode" + episodeId;
 
CloudBlobContainer container = storageAccount.CreateCloudBlobClient().GetContainerReference(containerName);
var folderDelete = container.GetDirectoryReference(deleteFolderPath);
//((CloudBlob)folderDelete).DeleteIfExists();