Azure Blob Container Web API Image Upload

BlobStorageMultipartStreamProvider.cs

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Web;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

namespace MyWeb.Extensions
{
    public class BlobStorageMultipartStreamProvider : MultipartStreamProvider
    {
        public override Stream GetStream(HttpContent parent, HttpContentHeaders headers)
        {
            Stream stream = null;
            ContentDispositionHeaderValue contentDisposition = headers.ContentDisposition;
            if (contentDisposition != null)
            {
                if (!String.IsNullOrWhiteSpace(contentDisposition.FileName))
                {
                    string connectionString = ConfigurationManager.AppSettings["my-connection-string"];
                    string containerName = ConfigurationManager.AppSettings["my-container"];
                    CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString);
                    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
                    CloudBlobContainer blobContainer = blobClient.GetContainerReference(containerName);

                    CloudBlockBlob blob = blobContainer.GetBlockBlobReference(contentDisposition.FileName);
                    stream = blob.OpenWrite();
                }
            }
            return stream;
        }
    }
}

SampleController.cs

using System.Net;
using System.Net.Http;
using System.Threading.Tasks;
using System.Web.Http;
using MyWeb.Extensions

namespace MyWeb.Controllers
{
    public class ImageUploadController : ApiController
    {
        public async Task<HttpResponseMessage> PostFormData()
        {
            if (!Request.Content.IsMimeMultipartContent())
            {
                throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
            }
            
            try
            {
              MultipartStreamProvider provider = new BlobStorageMultipartStreamProvider();
              await Request.Content.ReadAsMultipartAsync(provider);
            }
            catch (Exception)
            {
                throw new HttpResponseException(HttpStatusCode.InternalServerError);
            }
            
            return new HttpResponseMessage(HttpStatusCode.OK);
        }
    }
}