public static async Task <AppState> LoadAppStateInitial()
{
var file = await TryLoadConfigFile().ConfigureAwait(false);
AppState resultState = new AppState();
// app state no yet stored
if (file == null)
{
await StoreInitialAppState(resultState);
}
else
{
try
{
resultState = await XMLStorage.ReadObjectFromXmlFileAsync <AppState>(file).ConfigureAwait(false);
}
catch (Exception ex)
{
// try to overwrite inconsistent state or crash
await StoreInitialAppState(resultState);
}
}
return(resultState);
}
internal static async Task <AppState> LoadAppStateFromUserDefinedLocation()
{
AppState resultState = null;
var loadConfigPicker = new FileOpenPicker();
loadConfigPicker.ViewMode = PickerViewMode.List;
loadConfigPicker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
loadConfigPicker.FileTypeFilter.Add(".xml");
StorageFile file = await loadConfigPicker.PickSingleFileAsync();
if (file != null)
{
var token = StorageApplicationPermissions.FutureAccessList.Add(file, _userDefinedSettingsToken);
LocalSettings.Values[_userDefinedSettingsToken] = token;
resultState = await XMLStorage.ReadObjectFromXmlFileAsync <AppState>(file);
}
else
{
Debug.WriteLine("Loading file was cancelled.");
}
return(resultState);
}
internal static async Task SaveAppStateToUserDefinedLocation(AppState appState)
{
var savePicker = new Windows.Storage.Pickers.FileSavePicker();
savePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
savePicker.FileTypeChoices.Add("Plain Text", new List <string>()
{
".xml"
});
savePicker.SuggestedFileName = "HomeAutomationSettings";
Windows.Storage.StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
var token = StorageApplicationPermissions.FutureAccessList.Add(file, _userDefinedSettingsToken);
LocalSettings.Values[_userDefinedSettingsToken] = token;
// Prevent updates to the remote version of the file until
// we finish making changes and call CompleteUpdatesAsync.
//Windows.Storage.CachedFileManager.DeferUpdates(file); crashes when used with dropbox
// write to file
await XMLStorage.SaveObjectToXmlByFile(appState, file);
// Let Windows know that we're finished changing the file so
// the other app can update the remote version of the file.
// Completing updates may require Windows to ask for user input.
Windows.Storage.Provider.FileUpdateStatus status = await Windows.Storage.CachedFileManager.CompleteUpdatesAsync(file);
if (status == Windows.Storage.Provider.FileUpdateStatus.Complete)
{
Debug.WriteLine("File " + file.Name + " was saved.");
}
else
{
Debug.WriteLine("File " + file.Name + " couldn't be saved.");
}
}
else
{
Debug.WriteLine("Saving file was cancelled.");
}
}
public static async Task StoreAppState(AppState state)
{
var configFile = await TryLoadConfigFile();
await XMLStorage.SaveObjectToXmlByFile(state, configFile);
}
private static async Task StoreInitialAppState(AppState appState)
{
await XMLStorage.SaveObjectToXmlByFileName(appState, _settingsFilename).ConfigureAwait(false);
}
