AzureFileUploaderService.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using System.Web;
using MyProject.Services.Interfaces;
using Microsoft.Azure;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

namespace MyProject.Services
{
    public class AzureFileUploaderService: IAzureFileUploaderService
    {
        private readonly CloudStorageAccount _storageAccount;
        public AzureFileUploaderService()
        {
            // Retrieve storage account from connection string.
            _storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));
        }        

        public async Task<string> UploadPhotoAsync(HttpPostedFileBase photo, string prefix, string photoType)
        {
            if (photo == null || photo.ContentLength == 0)
            {
                return null;
            }

            string fullPath = null;
            // Stopwatch timespan = Stopwatch.StartNew();

            try
            {                

                // Create the blob client and reference the container
                CloudBlobClient blobClient = _storageAccount.CreateCloudBlobClient();
                CloudBlobContainer container = blobClient.GetContainerReference(photoType);
                if (await container.CreateIfNotExistsAsync())
                {
                    // Enable public access on the newly created "images" container
                    await container.SetPermissionsAsync(
                        new BlobContainerPermissions
                        {
                            PublicAccess = BlobContainerPublicAccessType.Blob
                        });
                }

                var guid = Guid.NewGuid();
                // Create a unique name for the images we are about to upload
                string imageName = string.Format("{0}-{1}-{2}", prefix, guid, photo.FileName);

                // Upload image to Blob Storage
                CloudBlockBlob blockBlob = container.GetBlockBlobReference(imageName);
                blockBlob.Properties.ContentType = photo.ContentType;
                await blockBlob.UploadFromStreamAsync(photo.InputStream);                      
                fullPath = blockBlob.Uri.ToString();

                // timespan.Stop();
                // log.TraceApi("Blob Service", "PhotoService.UploadPhoto", timespan.Elapsed, "imagepath={0}", fullPath);
            }
            catch (Exception ex)
            {

                //log.Error(ex, "Error upload photo blob to storage");
            }

            return fullPath;
        }
    }
}