blob storage第一次亲密接触

由于azure上各个云服务都是分开的，所以当一个地方生成文件后，我在别的地方想要读取他就变得困难，不过azure上面有解决方案，就是azure blob storage。

在现有的订阅账号下，新建一个存储blob，分私有和公共，私有的为私有存储，外部链接无法访问，公共则可以在外部直接通过链接进行存储内容的访问。

首先在cloud service和portal配置文件中均需添加一个key为storageAccount，value则为azure上的blobend，queueend，tableend，以及他的thumbprint。

在configuration文件中配置改存储名称。

 public static string EmailFileContainer
        {
            get
            {
                return "email-response-save";
            }
        }

建立一个BlobClient类，用来执行blob事件。

 public class BlobClient
     {
         private static CloudBlobClient _cloudBlobClient;

         static BlobClient()
         {
             _cloudBlobClient = CloudStorageAccount.Parse(Config.CloudStorageAccount).CreateCloudBlobClient();
             _cloudBlobClient.RetryPolicy = new LinearRetry(TimeSpan.FromSeconds(), );
         }

         /// <summary>
         /// Get file from blob
         /// </summary>
         /// <param name="containerName"></param>
         /// <param name="blobName"></param>
         /// <param name="blobPath"></param>
         public static void GetBlob(string containerName, string blobName, string blobPath)
         {
             var container = _cloudBlobClient.GetContainerReference(containerName);

             var blob = container.GetBlockBlobReference(blobName);
             var mode = System.IO.FileMode.Create;
             blob.DownloadToFileAsync(blobPath, mode);

             return;
         }

         /// <summary>
         /// Add file to blob
         /// </summary>
         /// <param name="containerName"></param>
         /// <param name="blobName"></param>
         /// <param name="blobPath"></param>
         /// <param name="blobFileName"></param>
         public static void AddBlob(string containerName, string blobName, string blobPath,string blobFileName)
         {
             var container = _cloudBlobClient.GetContainerReference(containerName);
             container.CreateIfNotExists();

             var blob = container.GetBlockBlobReference(blobName);
             var mode = System.IO.FileMode.Open;
             blob.UploadFromFileAsync(blobPath+blobFileName, mode);

             return;
         }

         public static void DeleteBlob(string containerName, string blobName)
         {
             var container = _cloudBlobClient.GetContainerReference(containerName);
             container.CreateIfNotExists();

             var blob = container.GetBlockBlobReference(blobName);
             blob.DeleteIfExistsAsync();

             return;
         }

         public static void DeleteBlobContainer(string containerName)
         {
             var container = _cloudBlobClient.GetContainerReference(containerName);
             container.CreateIfNotExists();

             foreach (var item in container.ListBlobs(null, false))
             {
                 foreach (var item1 in ((CloudBlobDirectory)item).ListBlobs())
                 {
                     foreach (var item2 in ((CloudBlobDirectory)item1).ListBlobs())
                     {
                         ((CloudBlockBlob)item2).DeleteIfExistsAsync();
                     }
                 }
             }
         }
     }

执行写入blob storage步骤。

BlobClient.AddBlob(Config.EmailFileContainer, "MailExportTotalImage/"+ imgName, location, imgName);

读取blob storage中的文件。

BlobClient.GetBlob(Config.EmailFileContainer, "MailExportAttachment1/" + sFileName, uploadPath + sFileName);

将内存流数据存入TXT。

var fn = DateTime.Now.ToString("yyyyMMddHHmmss") + ".txt";
byte[] bs = stream.ToArray();
String contentStr = System.Text.Encoding.UTF8.GetString(bs);       

BlobClient.AddBlob(Config.FileContainer, fn, contentStr);

若要创建公共可访问文件的链接，需在对应云服务的configuration文件中申明一个设置名称。

<ConfigurationSettings>
      <!--Local-->
      <Setting name="aaaa" value="bbbbbbbbbbb" />
        .
        .
        .
      <Setting name="EmailBlobStorage" value="http(s)://xxx.blob.core.chinacloudapi.cn/email-response-save/" />
 </ConfigurationSettings>

核心configuration文件中建立一个指向云服务configuration特定设置名称的属性。

public static string EmailBlobStorage
        {
            get
            {
                return CloudConfigurationManager.GetSetting("EmailBlobStorage");
            }
        }

使用：

var location = Config.EmailBlobStorage;
var imgsrc = location + "MailExportTotalImage/" + string.Format("{0:yyyy-MM-dd}", DateTime.Today.ToGmt8()) + _title + ".png";