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 changingif (e.Changes.Any(change => change is RoleEnvironmentConfigurationSettingChange)){// Set e.Cancel to true to restart this role instancee.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 中增加了缓存的设置[可选]

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