C # Azure Storage-blob

1. Preface

This article was written according to the Azure documentation and I did the verification.

If you want to download the demo from Microsoft website, go to GitHub https://github.com/Azure-Samples/storage-blob-dotnet-getting-started

2. Introduction

Azure Blob is a service that stores a lot of space and can allow storage and access over HTTP or HTTPS. A blob is a property that has public and private properties. The public is a link that everyone can see, and the private is to access the resource through the secret key.

BLOBs can be stored:

1) Images or document pointing to a folder

2) Save File

3) Video and audio

4) Backup and recovery of stored data, disaster recovery and archiving

5) Analytics by a locally stored data or Azure managed service

3. Concept

1) Container container:

A container can contain many blobs, and an account can contain a lot of containers containers. Please note that the container name is lowercase.

2) Blob:

A BLOB is the property and size of a file. Azure storage blobs consists of three types: block BLOBs, page blobs, append blobs.

Block BLOBs: Stores text and binary files, such as documents and media type files.

Append blobs: is similar to block blobs, but it is an operation optimized, so it is used for logging operations. A simple block blob or append blob can contain 5,000 blocks, up to 4MB per file, with a maximum size of 194GB (4mb*50000)

Page blobs: Up to 1TB, is an operation that can read and write.

4. Code Start

1) Create a storage account

For steps to create a store, refer to

Http://www.cnblogs.com/alunchen/p/5765700.html

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2) Import the package and enter the following command on the package Manager:

Install-package Windowsazure.storage

Install-package Microsoft.WindowsAzure.ConfigurationManager

2) Establish a connection

              string"Defaultendpointsprotocol=https; Accountname=ceslighttest; accountkey=cp3jxyfxu6xhv18ovqw2q7urhohxhm9guwl6ueltbwd9nxxxxxxxxxxxxxx; endpointsuffix=core.chinacloudapi.cn";                 // Establish a connection                Cloudstorageaccount Storageaccount = cloudstorageaccount.parse (connstr);                = Storageaccount.createcloudblobclient ();

3) Create a container

             //  create container, presence or absence                Cloudblobcontainer container = blobclient.getcontainerreference ("testuimageblobcontainercompanyname ");              Container. Createifnotexists ();

4) Set permissions

The container is private by default, meaning that you want to specify a key to download the picture. If you want to set the picture to be downloaded anywhere, please set it to public

                // container default is private, meaning to specify key to download pictures. If you want to set the picture to be downloaded anywhere, please set itto public                container. SetPermissions (new blobcontainerpermissions {publicaccess = Blobcontainerpublicaccesstype.blob});

5) Create the file and upload the local file

             //  Create a file name and replace                it if you have the same file name Cloudblockblob Blockblob = container. Getblockblobreference ("23.jpg");                 // uploading local Files                using (var fileStream = System.IO.File.OpenRead (@ "E:\23.jpg"))                {                    blockblob.uploadfromstream (fileStream);                }

6) Show all blobs files inside the container

               //output file size vs. path URI                foreach(Ilistblobitem IteminchContainer. Listblobs (NULL,false))                {                    if(item. GetType () = =typeof(Cloudblockblob)) {Cloudblockblob blob=(CLOUDBLOCKBLOB) item; R+=string. Format ("Block blob of length {0}: {1}", Blob. Properties.length, Blob.                    Uri); }                    Else if(item. GetType () = =typeof(Cloudpageblob)) {Cloudpageblob Pageblob=(CLOUDPAGEBLOB) item; R+=string. Format ("Page blob of length {0}: {1}", PageBlob.Properties.Length, Pageblob.uri); }                    Else if(item. GetType () = =typeof(cloudblobdirectory)) {Cloudblobdirectory directory=(cloudblobdirectory) item; R+=string. Format ("Directory: {0}", directory.                    Uri); }                }

C # Azure Storage-blob