Windows azure 上將Legcay IO操作輕鬆切換到Blob

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上載者:User

您準備遷移到azure平台上的程式有大量的類似於File.()…的操作?

不用著急,MS發布的 Microsoft.WindowsAzure.CloudDrive 提供的 API,即可方便的切換到Blob中。

假設您有一個FileUpload的控制項,您可能有這樣的代碼:

File.WriteAllBytes(string.Format("{0}\\{1}", Server.MapPath("~\Data"), fileName), this.FileUpload1.FileBytes);

切換到 Blob?  使用 CloudDrive 提供的API,只需做少量的修改即可。

引用 Microsoft.WindowsAzure.CloudDrive

1. 修改 WebRole

public class WebRole : RoleEntryPoint    {        public static string DriveLetter { get; private set; }        CloudDrive myCloudDrive;        public override bool OnStart()        {            CloudStorageAccount.SetConfigurationSettingPublisher((configName, configSetter) =>            {                configSetter(RoleEnvironment.GetConfigurationSettingValue(configName));                RoleEnvironment.Changed += (sender, arg) =>                {                    if (arg.Changes.OfType<RoleEnvironmentConfigurationSettingChange>().Any((change) => (change.ConfigurationSettingName == configName)))                    {                        if (!configSetter(RoleEnvironment.GetConfigurationSettingValue(configName)))                        {                            RoleEnvironment.RequestRecycle();                        }                    }                };            });            RoleEnvironment.Changing += RoleEnvironmentChanging;            return base.OnStart();        }        private void RoleEnvironmentChanging(object sender, RoleEnvironmentChangingEventArgs e)        {            // If a configuration setting is changing            if (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange))            {                // Set e.Cancel to true to restart this role instance                e.Cancel = true;            }        }        public override void OnStop()        {            myCloudDrive.Unmount();            base.OnStop();        }        public override void Run()        {            string containerName = "drives";            string blobName = "mydrive.vhd";            CloudStorageAccount storageAccount = CloudStorageAccount.FromConfigurationSetting("DiagnosticsConnectionString");
            LocalResource localCache = RoleEnvironment.GetLocalResource("InstanceDriveCache");            CloudDrive.InitializeCache(localCache.RootPath, localCache.MaximumSizeInMegabytes);            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();            blobClient.GetContainerReference(containerName).CreateIfNotExist();            // create Cloud Drive             myCloudDrive = storageAccount.CreateCloudDrive(blobClient.GetContainerReference(containerName).GetPageBlobReference(blobName).Uri.ToString());            try            {                myCloudDrive.Create(32);            }            catch (CloudDriveException ex)            {            }            DriveLetter = myCloudDrive.Mount(0, DriveMountOptions.Force);            base.Run();        }    }2. ServiceDefinition 中增加了緩衝的設定[可選]

<ServiceDefinition name="CloudWebDemo" xmlns="http://schemas.microsoft.com/ServiceHosting/2008/10/ServiceDefinition">
  <WebRole name="WebRole1">
    <InputEndpoints>
      <InputEndpoint name="HttpIn" protocol="http" port="80" />
    </InputEndpoints>
    <ConfigurationSettings>
      <Setting name="DiagnosticsConnectionString" />
    </ConfigurationSettings>
    <LocalResources>
      <LocalStorage name="InstanceDriveCache" cleanOnRoleRecycle="false" sizeInMB="100" />
    </LocalResources>
  </WebRole>
</ServiceDefinition>

3. 修改檔案操作的代碼

 File.WriteAllBytes(string.Format("{0}\\{1}",  WebRole.DriveLetter, fileName), this.FileUpload1.FileBytes);
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