Windows Phone 7 便捷记事本实例

这是一个很简单的记事本，利用了本地存储实时记录下你写下的内容，退出程序的时候将自动保存记事本的内容。下面的工具条是放大和缩小字体的功能。

用自定义的QuickNotesSettings类来保存记事本的内容和字体的大小，同时封装了记事本的加载方法和保存方法。

using System;
using System.IO.IsolatedStorage;
using System.Windows;

namespace QuickNotes
{
    public class QuickNotesSettings
    {
        public QuickNotesSettings()
        {
            this.Text = "";
            this.FontSize = (double)Application.Current.Resources["PhoneFontSizeMediumLarge"];
        }

        public string Text { set; get; }
        public double FontSize { set; get; }
        //静态方法获取本地存储的记事本内容
        public static QuickNotesSettings Load()
        {
            IsolatedStorageSettings isoSettings = IsolatedStorageSettings.ApplicationSettings;
            QuickNotesSettings settings;

            if (!isoSettings.TryGetValue<QuickNotesSettings>("settings", out settings))
                settings = new QuickNotesSettings();

            return settings;
        }
        //保存到本地存储中
        public void Save()
        {
            IsolatedStorageSettings isoSettings = IsolatedStorageSettings.ApplicationSettings;
            isoSettings["settings"] = this;//保存的就是这个类的实例
        }
    }
}

xaml文件

<!--LayoutRoot contains the root grid where all other 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="Quick Notes" Style="{StaticResource PhoneTextNormalStyle}"/>
        </StackPanel>

        <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <TextBox Name="txtbox"
                     TextWrapping="Wrap"
                     AcceptsReturn="True"
                     VerticalScrollBarVisibility="Auto"
                     TextChanged="OnTextBoxTextChanged" />
        </Grid>
    </Grid>
    
    <phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar>
            <!--缩小-->
            <shell:ApplicationBarIconButton IconUri="/Images/littleletter.icon.png" 
                                            Text="smaller font"
                                            Click="OnAppBarSmallerFontClick" />
            <!--放大-->
            <shell:ApplicationBarIconButton IconUri="/Images/bigletter.icon.png" 
                                            Text="larger font"
                                            Click="OnAppBarLargerFontClick" />
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>

对应的cs后台文件

using System;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Phone.Controls;

namespace QuickNotes
{
    public partial class MainPage : PhoneApplicationPage
    {
        QuickNotesSettings appSettings = (Application.Current as App).AppSettings;
        
        public MainPage()
        {
            InitializeComponent();

            txtbox.Text = appSettings.Text;
            txtbox.FontSize = appSettings.FontSize;
        }
        //即时保存记事本的内容到，本地存储中去
        void OnTextBoxTextChanged(object sender, TextChangedEventArgs args)
        {
            appSettings.Text = txtbox.Text;
        }
        //缩小字体
        void OnAppBarSmallerFontClick(object sender, EventArgs args)
        {
            txtbox.FontSize = Math.Max(12, txtbox.FontSize - 1);
            appSettings.FontSize = txtbox.FontSize;
        }
        //放大字体
        void OnAppBarLargerFontClick(object sender, EventArgs args)
        {
            txtbox.FontSize = Math.Min(48, txtbox.FontSize + 2);
            appSettings.FontSize = txtbox.FontSize;
        }
    }
}

app.xaml.cs主程序文件修改

……
public QuickNotesSettings AppSettings { set; get; }
        public PhoneApplicationFrame RootFrame { get; private set; }

        public App()
        {

            UnhandledException += Application_UnhandledException;
            InitializeComponent();
            InitializePhoneApplication();
        }

        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
            AppSettings = QuickNotesSettings.Load();
        }

        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            AppSettings = QuickNotesSettings.Load();
        }

        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            AppSettings.Save();
        }

        private void Application_Closing(object sender, ClosingEventArgs e)
        {
            AppSettings.Save();
        }
……