AzureBlobBlog-OpenWrite.cs

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;
using System;
using System.IO;

namespace AzureBlobBlogStream
{
    class Program
    {
        static string localFilePath = @"c:\tmp";

        static void Main(string[] args)
        {
            AzureBlobStreamTest();
        }

        private static void AzureBlobStreamTest()
        {
            string storageConnectionString = "<insert blob storage connection string here>";

            CloudStorageAccount account;
            CloudStorageAccount.TryParse(storageConnectionString, out account);

            CloudBlobClient cloudBlobClient = account.CreateCloudBlobClient();

            CloudBlobContainer container = cloudBlobClient.GetContainerReference("zipfiles");

            // Create a new blob object to reference for the stream
            // Using a Guid for the name for demo purposes
            var blob = container.GetBlockBlobReference(Guid.NewGuid().ToString());

            try
            {
                using (Stream blobStream = blob.OpenWrite())
                {
                    for (int i = 0; i < 256; i++)
                    {
                        string tempFilePath = Path.Combine(localFilePath, $"file{i}");

                        CreateRandomTempFile(tempFilePath, 8);

                        using (FileStream fs = new FileStream(tempFilePath, FileMode.Open))
                        {
                            fs.CopyTo(blobStream);
                        }

                        File.Delete(tempFilePath);
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Exception in BlobStreamTest: {ex.Message}");
                Console.ReadLine();
            }

        }

        private static void CreateRandomTempFile(string fileName, long lengthInMb)
        {
            // https://stackoverflow.com/questions/4432178/creating-a-random-file-in-c-sharp
            byte[] data = new byte[lengthInMb * 1024 * 1024];
            Random rng = new Random();
            rng.NextBytes(data);
            File.WriteAllBytes(fileName, data);
        }
    }
}