Windows Azure Storage (2) Windows Azure Storage Service存储服务之Blob详解(上)

using Microsoft.WindowsAzure.StorageClient;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.ServiceRuntime;
using System.Collections.Specialized;
using Microsoft.WindowsAzure.StorageClient.Protocol;

namespace MyWebRole
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                this.EnsureContainerExists();
            }
        }

        private void EnsureContainerExists()
        {
            var container = GetContainer();

            // 检查container是否被创建，如果没有，创建container
            container.CreateIfNotExist();

            var permissions = container.GetPermissions();
            //对Storage的访问权限是可以浏览Container
            permissions.PublicAccess = BlobContainerPublicAccessType.Container;

            container.SetPermissions(permissions);
        }

        private CloudBlobContainer GetContainer()
        {
            //获取ServiceConfiguration.cscfg配置文件的信息
            var account = CloudStorageAccount.FromConfigurationSetting("DataConnectionString");
            var client = account.CreateCloudBlobClient();
            //获得BlobContainer对象
            return client.GetContainerReference(RoleEnvironment.GetConfigurationSettingValue("ContainerName"));
        }

        protected void upload_Click(object sender, EventArgs e)
        {
            if (imageFile.HasFile)
            {
                //输出图片文件的信息
                status.Text = "Inserted [" + imageFile.FileName + "] - Content Type [" + imageFile.PostedFile.ContentType + "] - Length [" + imageFile.PostedFile.ContentLength + "]";

                this.SaveImage(imageFile.FileName,imageFile.PostedFile.ContentType,imageFile.FileBytes);              
            }
            else
                status.Text = "No image file";
        }


        private void SaveImage(string fileName, string contentType, byte[] data)
        {
            //获得BlobContainer对象并把文件上传到这个Container
            var blob = this.GetContainer().GetBlobReference(fileName);
            blob.Properties.ContentType = contentType;

            // 创建元数据信息
            var metadata = new NameValueCollection();
            metadata["Name"] = fileName;

            // 上传图片
            blob.Metadata.Add(metadata);
            blob.UploadByteArray(data);
        }

　　　　//发现Azure Storage升级到2.0后API变了
      private void SaveImage(string fileName, string contentType, byte[] data)
        {
            //获得BlobContainer对象并把文件上传到这个Container
            var blob = this.GetContainer().GetBlockBlobReference(fileName);
            blob.Properties.ContentType = contentType;

            using (var ms = new MemoryStream(data, false))
            {
                blob.UploadFromStream(ms);
            }
        }
    }

 void Application_Start(object sender, EventArgs e)

{
// This code sets up a handler to update CloudStorageAccount instances when their corresponding
// configuration settings change in the service configuration file.
            CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>

{
// Provide the configSetter with the initial value
                configSetter(RoleEnvironment.GetConfigurationSettingValue(configName));

});

}