ApplicationData applicationData =  ApplicationData.Current;     // 提供对与应用程序的应用程序包相关的应用程序数据存储的访问。ApplicationDataContainer roamingSettings = applicationData.RoamingSettings; //获取漫游应用程序数据存储区中的应用程序设置容器。const string settingName = "userName";applicationData.DataChanged += new TypedEventHandler<ApplicationData, object>(DataChangedHandler); // 在同步漫游应用程序数据时发生。

 async void DataChangedHandler(Windows.Storage.ApplicationData appData, object o){
          //当触发 DataChanged 事件时调用// DataChangeHandler may be invoked on a background thread, so use the Dispatcher to invoke the UI-related code on the UI thread.await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>{Object value = roamingSettings.Values[settingName];OutputTextBlock.Text = "Name: " + (value == null ? "<empty>" : ("\"" + value + "\""));             });}

  roamingSettings.Values[settingName] = UserName.Text;// Simulate roaming by intentionally signaling a data changed event.  向所有已注册的事件处理程序发送数据更改事件。applicationData.SignalDataChanged();

 ApplicationData applicationData = ApplicationData.Current; //提供对与应用程序的应用程序包相关的应用程序数据存储的访问。

ApplicationDataContainer roamingSettings = applicationData.RoamingSettings; // 获取漫游应用程序数据存储区中的应用程序设置容器。
applicationData.DataChanged += new TypedEventHandler<ApplicationData, object>(DataChangedHandler); // 在同步漫游应用程序数据时发生。

 async void DataChangedHandler(Windows.Storage.ApplicationData appData, object o){// DataChangeHandler may be invoked on a background thread, so use the Dispatcher to invoke the UI-related code on the UI thread.await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>{int counter = Convert.ToInt32(roamingSettings.Values["HighPriority"]);OutputTextBlock.Text = "Counter: " + counter +  "(updated remotely)" ;         });}

 int counter = Convert.ToInt32(roamingSettings.Values["HighPriority"]); //获取并增加 HighPriority 对应的值
roamingSettings.Values["HighPriority"] = counter + 1;

  ApplicationData appData = ApplicationData.Current; //  提供对与应用程序的应用程序包相关的应用程序数据存储的访问。try{StorageFile sourceFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///assets/appDataLocal.png"));  //异步获取应用程序中的文件await sourceFile.CopyAsync(appData.LocalFolder);  //  在本地应用程序数据存储区中的根文件夹中创建文件的副本。当此方法成功完成时，它将返回表示副本的 StorageFile
            }catch (Exception){// If the image has already been copied the CopyAsync() method above will fail.// Ignore this error.
            }try{StorageFile sourceFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///assets/appDataRoaming.png"));await sourceFile.CopyAsync(appData.RoamingFolder); //  在漫游应用程序数据存储区中的根文件夹中创建文件的副本。
            }catch (Exception){// If the image has already been copied the CopyAsync() method above will fail.// Ignore this error.
            }try{StorageFile sourceFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///assets/appDataTemp.png"));await sourceFile.CopyAsync(appData.TemporaryFolder); //在临时应用程序数据存储区中的根文件夹中创建文件的副本。
            }catch (Exception){// If the image has already been copied the CopyAsync() method above will fail.// Ignore this error.
            }LocalImage.Source = new Windows.UI.Xaml.Media.Imaging.BitmapImage(new Uri("ms-appdata:///local/appDataLocal.png")); //本地的RoamingImage.Source = new Windows.UI.Xaml.Media.Imaging.BitmapImage(new Uri("ms-appdata:///roaming/appDataRoaming.png"));//漫游的TempImage.Source = new Windows.UI.Xaml.Media.Imaging.BitmapImage(new Uri("ms-appdata:///temp/appDataTemp.png"));//临时的}

 async void Clear_Click(Object sender, RoutedEventArgs e){try{await Windows.Storage.ApplicationData.Current.ClearAsync();OutputTextBlock.Text = "ApplicationData has been cleared.  Visit the other scenarios to see that their data has been cleared.";}catch (Exception){OutputTextBlock.Text = "Unable to clear settings. This can happen when files are in use.";}}

// SetVerion 页面类中的成员public sealed partial class SetVersion : Page{ApplicationData appData = null;const string settingName = "SetVersionSetting";const string settingValue0 = "Data.v0";const string settingValue1 = "Data.v1";public SetVersion(){this.InitializeComponent();appData = ApplicationData.Current; //提供对与应用程序的应用程序包相关的应用程序数据存储的访问。
DisplayOutput();}// SetVersionRequest :  当应用程序在其应用程序数据存储中设置应用程序数据的版本时提供数据。void SetVersionHandler0(SetVersionRequest request){SetVersionDeferral deferral = request.GetDeferral(); // 请求延迟集版本请求。uint version = appData.Version; // 获取应用程序数据存储区中的应用程序数据的版本号。switch (version){case 0:// Version is already 0.  Nothing to do.break;case 1:// Need to convert data from v1 to v0.// This sample simulates that conversion by writing a version-specific value.appData.LocalSettings.Values[settingName] = settingValue0;break;default:throw new Exception("Unexpected ApplicationData Version: " + version);}deferral.Complete();  // 通知系统应用程序已在其应用程序数据存储区设置应用程序数据的版本。
        }void SetVersionHandler1(SetVersionRequest request){SetVersionDeferral deferral = request.GetDeferral();uint version = appData.Version;switch (version){case 0:// Need to convert data from v0 to v1.// This sample simulates that conversion by writing a version-specific value.appData.LocalSettings.Values[settingName] = settingValue1;break;case 1:// Version is already 1.  Nothing to do.break;default:throw new Exception("Unexpected ApplicationData Version: " + version);}deferral.Complete();}async void SetVersion0_Click(Object sender, RoutedEventArgs e){await appData.SetVersionAsync(0, new ApplicationDataSetVersionHandler(SetVersionHandler0));  // 设置应用程序数据存储区中的应用程序数据的版本号。
            DisplayOutput();}async void SetVersion1_Click(Object sender, RoutedEventArgs e){await appData.SetVersionAsync(1, new ApplicationDataSetVersionHandler(SetVersionHandler1));DisplayOutput();}void DisplayOutput(){OutputTextBlock.Text = "Version: " + appData.Version;}