wp8 独立存储 总结2（文件存储）

一、wp7.1APIs

Isolated Storage Classes

•独立存储类在System.IO.IsolatedStorage命名空间中
•IsolatedStorageFile
•表示包含文件和目录的独立存储区
•IsolatedFileStream
•公开独立存储中的文件

Saving Data

private void saveGameToIsolatedStorage(string message){using(IsolatedStorageFile isf =IsolatedStorageFile.GetUserStoreForApplication()){using(IsolatedStorageFileStreamrawStream= isf.CreateFile("MyFile.store")){StreamWriterwriter = newStreamWriter(rawStream);writer.WriteLine(message); // save the messagewriter.Close();}}}

Loading Data

private string loadString(){stringresult = null;using(IsolatedStorageFileisf= IsolatedStorageFile.GetUserStoreForApplication()){if(isf.FileExists("Myfile.store"){using(IsolatedStorageFileStreamrawStream= isf.OpenFile(filename, System.IO.FileMode.Open)) {StreamReaderreader = newStreamReader(rawStream);result = reader.ReadLine();reader.Close();}}}return result;}

</pre><pre name="code" class="csharp">下面是ADDpange的部分代码

namespace PhoneApp1{    public partial class AddPage : PhoneApplicationPage    {        public AddPage()        {            InitializeComponent();        }        protected override void OnNavigatedTo(NavigationEventArgs e)        {            base.OnNavigatedTo(e);            if (this.State.ContainsKey("IncompleteEntry"))            {                this.logtext.Text = this.State["IncompleteEntry"] as string;            }        }        protected override void OnNavigatedFrom(NavigationEventArgs e)        {            if (e.NavigationMode != System.Windows.Navigation.NavigationMode.Back &&                e.NavigationMode != System.Windows.Navigation.NavigationMode.Forward)            {                this.State["IncompleteEntry"] = this.logtext.Text;            }            base.OnNavigatedFrom(e);        }        private void ApplicationBarIconButton_Click(object sender, EventArgs e)        {            SaveEntry();            if (NavigationService.CanGoBack)            {                NavigationService.GoBack();            }        }        private void cancel_Click(object sender, EventArgs e)        {            if (NavigationService.CanGoBack)            {                NavigationService.GoBack();            }        }        private async void SaveEntry()        {            string timeshow = System.DateTime.Now + System.Environment.NewLine;            App thisapp = App.Current as App;//利用APP属性传递值            thisapp.logdata = FileStorageOperation.LoadFromIsolatedStorage();            thisapp.logdata = thisapp.logdata + timeshow + logtext.Text + System.Environment.NewLine;            FileStorageOperation.SavetoIsolatedStorage(thisapp.logdata);        }    }}

在APP.XAML.CS加入属性的值

public string logdata
        {
            set;
            get;
        }

在显示的页面加入

 protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);
           


            App thisapp = App.Current as App;


            thisapp.logdata = FileStorageOperation.LoadFromIsolatedStorage();


            showblock.Text = thisapp.logdata;
        }