Windows 8中的PhoneApplicationService.Current.State等价物

我正在寻找Windows 8.x中的等效类。 我们在Windows Phone API中找到的PhoneApplicationService.Current.State的API。

基本上，我试图在会话中的页面之间保持简单的对象数据。 或者Windows 8中是否还有其他选项可以实现此目的？

Answer 1

我不建议使用State，只使用IsolatedStorage来保存会话和页面之间的数据要容易得多，保持简单。
所有数据都应保存在ApplicationData.Current.LocalSettings或IsolatedStorageSettings.ApplicationSettings中，以防它们是简单对象，如string，bool，int。

// on Windows 8 // input value string userName = "John"; // persist data ApplicationData.Current.LocalSettings.Values["userName"] = userName; // read back data string readUserName = ApplicationData.Current.LocalSettings.Values["userName"] as string; // on Windows Phone 8 // input value string userName = "John"; // persist data IsolatedStorageSettings.ApplicationSettings["userName"] = userName; // read back data string readUserName = IsolatedStorageSettings.ApplicationSettings["userName"] as string; 

复杂对象（如整数，字符串等）应该以可能的JSON格式保存在ApplicationData.Current.LocalFolder中（您需要来自NuGet的JSON.net包）：

 // on Windows 8 // input data int[] value = { 2, 5, 7, 9, 42, 101 }; // persist data string json = JsonConvert.SerializeObject(value); StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("myData.json", CreationCollisionOption.ReplaceExisting); await FileIO.WriteTextAsync(file, json); // read back data string read = await PathIO.ReadTextAsync("ms-appdata:///local/myData.json"); int[] values = JsonConvert.DeserializeObject(read); // on Windows Phone 8 // input data int[] value = { 2, 5, 7, 9, 42, 101 }; // persist data string json = JsonConvert.SerializeObject(value); StorageFile file = await ApplicationData.Current.LocalFolder.CreateFileAsync("myData.json", CreationCollisionOption.ReplaceExisting); using (Stream current = await file.OpenStreamForWriteAsync()) { using (StreamWriter sw = new StreamWriter(current)) { await sw.WriteAsync(json); } } // read back data StorageFile file2 = await ApplicationData.Current.LocalFolder.GetFileAsync("myData.json"); string read; using (Stream stream = await file2.OpenStreamForReadAsync()) { using (StreamReader streamReader = new StreamReader(stream)) { read = streamReader.ReadToEnd(); } } int[] values = JsonConvert.DeserializeObject(read);