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Because the application is designed to work seamlessly even in the absence of a network connection, it needs an interface to store and retrieve note data from local storage when the WCF service cannot be reached To facilitate that, you create a class called LocalNoteManagerClient, shown in Listing 8-7 This class mirrors the service contract used on the WCF service, but it implements all the note datamanagement functionality using the isolated storage feature in Silverlight To learn more about isolated storage, see 3 Listing 8-7 LocalNoteManagerClient Class for Local Note Management //Manages notes on the local client using Isolated Storage as the backing store public class LocalNoteManagerClient { //gets all the dates public List<DateTime> GetDates() { IsolatedStorageFile AppStore = IsolatedStorageFileGetUserStoreForApplication(); //get all the existing folders - each folder represents a date //for which notes exist string[] val = AppStoreGetDirectoryNames(); return AppStoreGetDirectoryNames() Select((sz) => DateTimeParse(szReplace("_","/"))).

<menubar style="float:right;"> <menuitem label="Seller" href="/seller.zul"/> <menuitem label="Catalog" href="/catalog.zul#0"/> <menuitem label="Map" href="/mapAll.zul"/> <menuitem label="Home" href="/index.zul"/> </menubar>

ToList(); }.

1. We try to be selective about how we advertise our jobs, so as to limit the amount of noise in the resume pile. 2. We certainly don t hire based on resumes; we only screen out based on resumes to reduce the number of people whom we have to interview. 3. In order to sort the remaining resumes to decide what order to interview people, we use a strictly objective system of reviewing and scoring them, so at least we are being fair and consistent in our interpretation of that very weak signal that comes from resumes.

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//gets all the notes stored in local storage for a specific date public ObservableCollection<Note> GetNotesForDate(DateTime ForDate) { ObservableCollection<Note> RetVal = new ObservableCollection<Note>(); IsolatedStorageFile AppStore = IsolatedStorageFile.GetUserStoreForApplication(); //get the folder corresponding to this date string DirPath = ForDate.ToShortDateString().Replace("/", "_"); //if folder exists if (AppStore.DirectoryExists(DirPath)) { //get all the files string[] FileNames = AppStore. GetFileNames(System.IO.Path.Combine(DirPath, "*.note")); foreach (string FileName in FileNames) { //open a file IsolatedStorageFileStream fs = AppStore. OpenFile(System.IO.Path.Combine(DirPath, FileName), FileMode.Open); //deserialize DataContractJsonSerializer serNote = new DataContractJsonSerializer(typeof(Note)); //add to returned collection RetVal.Add(serNote.ReadObject(fs) as Note); //close file fs.Close(); } } //return collection return RetVal; } //adds a note to local storage public void AddNote(Note note) { IsolatedStorageFile AppStore = IsolatedStorageFile.GetUserStoreForApplication(); string DirPath = note.LastModified.ToShortDateString().Replace("/", "_"); //if a directory for the note date does not exist - create one if (AppStore.DirectoryExists(DirPath) == false) AppStore.CreateDirectory(DirPath); string FilePath = string.Format("{0}\\{1}", DirPath, note.NoteID + ".note"); //create file, serialize and store IsolatedStorageFileStream fs = AppStore. OpenFile(FilePath, FileMode.Create);

DataContractJsonSerializer serNote = new DataContractJsonSerializer(typeof(Note)); serNote.WriteObject(fs, note); fs.Close(); } //removes a note from local storage public void RemoveNote(DateTime ForDate, string NoteID) { IsolatedStorageFile AppStore = IsolatedStorageFile.GetUserStoreForApplication(); string FilePath = string.Format("{0}\\{1}", ForDate.ToShortDateString().Replace("/", "_"), NoteID + ".note") ; if (AppStore.FileExists(FilePath)) AppStore.DeleteFile(FilePath); } } Now, let s look at the main application functionality, most of which is in the MainPage.xaml.cs codebehind class. Listing 8-8 shows the MainPage class. Listing 8-8. MainPage.xaml.cs Codebehind Class for the Offline NoteTaker public partial class MainPage : UserControl, INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; //initialize to a blank note private Note _CurrentNote = new Note() { NoteID = Guid.NewGuid().ToString(), LastModified = DateTime.Now }; //Tracks the currently selected/displayed note public Note CurrentNote { get { return _CurrentNote; } set { if (value != _CurrentNote) { _CurrentNote = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("CurrentNote")); } }

} private ObservableCollection<TreeNodeData> _NotesByDate = default(ObservableCollection<TreeNodeData>); //Collection of TreeNodeData that binds to the TreeView to display saved notes public ObservableCollection<TreeNodeData> NotesByDate { get { //initialize to a blank collection if (_NotesByDate == null) _NotesByDate = new ObservableCollection<TreeNodeData>(); return _NotesByDate; } set { if (value != _NotesByDate) { _NotesByDate = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("NotesByDate")); } } } //Indicates if the app is running offline - used to bind to XAML public bool Installed { get { return Application.Current.InstallState == InstallState.Installed; } } //Indicates if network connectivity is available - used to bind to XAML public bool NetworkOn { get { return NetworkInterface.GetIsNetworkAvailable(); } } public MainPage() { InitializeComponent();

Here are the three main requirements that we are going to implement: Allow the user to publish information about pets for sale. Allow the user to browse pet information and photos. Allow the user to search for a pet s location with Google Maps.

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