修炼九阴真经Windows Phone开发 (8)：独立存储Isolated storage

前台XAML

<phone:PhoneApplicationPage 
    x:Class="IsolatedStorageApp.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!--TitlePanel contains the name of the application and page title-->
        <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle" Text="ISOLATED STORAGE" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock x:Name="PageTitle" Text="独立存储" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>

        <!--ContentPanel - place additional content here-->
        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <TextBox Height="72" HorizontalAlignment="Left" Margin="-1,42,0,0" Name="txtWrite" Text="" VerticalAlignment="Top" Width="416" />
            <Button Content="保存" Height="72" HorizontalAlignment="Left" Margin="-1,160,0,0" Name="btnWrite" VerticalAlignment="Top" Width="160" Click="txtWrite_Click" />
            <TextBlock Height="149" HorizontalAlignment="Left" Margin="12,275,0,0" Name="txtRead" Text="" VerticalAlignment="Top" Width="403" />
            <Button Content="读取" Height="72" HorizontalAlignment="Left" Margin="-1,450,0,0" Name="btnRead" VerticalAlignment="Top" Width="160" Click="btnRead_Click" />
        </Grid>
    </Grid>
 
    <!--Sample code showing usage of ApplicationBar-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="MenuItem 1"/>
                <shell:ApplicationBarMenuItem Text="MenuItem 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

 

 

后台 CS：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.IO;
using System.IO.IsolatedStorage;


namespace IsolatedStorageApp
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }

        private void txtWrite_Click(object sender, RoutedEventArgs e)
        {
            //Obtain the virtual store for application
            IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();

            //Create a new folder and call it "FavorFolder"
            myStore.CreateDirectory("FavorFolder");

            //Create a new file and assign a StreamWriter to the store and this new file (myFile.txt)
            //Also take the text contents from the txtWrite control and write it to myFile.txt

            StreamWriter writeFile = new StreamWriter(new IsolatedStorageFileStream("FavorFolder\\myFile.txt", FileMode.OpenOrCreate, myStore));
            writeFile.WriteLine(txtWrite.Text);
            writeFile.Close();
        }

        private void btnRead_Click(object sender, RoutedEventArgs e)
        {
            //Obtain a virtual store for application
            IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();

            //This code will open and read the contents of myFile.txt
            //Add exception in case the user attempts to click Read button first.

            StreamReader readFile = null;

            try
            {
                readFile = new StreamReader(new IsolatedStorageFileStream("FavorFolder\\myFile.txt", FileMode.Open, myStore));
                string fileText = readFile.ReadLine();

                //The control txtRead will display the text entered in the file
                txtRead.Text = fileText;
                readFile.Close();
            }
            catch
            {
                txtRead.Text = "Need to create directory and the file first.";
            }
        }
    }
}

总结：如果是保存临时数据(一次执行周期之间的数据)最好使用PhoneApplicationService类保存;如果是保存应用程序设置(多次执行周期之间保存数据)最好使用独立存储IsolatedStorageSettings类保存。