Windows Phone 7 便捷記事本執行個體

這是一個很簡單的記事本，利用了本機存放區即時記錄下你寫下的內容，退出程式的時候將自動儲存記事本的內容。下面的工具條是放大和縮小字型的功能。

用自訂的QuickNotesSettings類來儲存記事本的內容和字型的大小，同時封裝了記事本的載入方法和儲存方法。

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; }
//靜態方法擷取本機存放區的記事本內容
        public static QuickNotesSettings Load()
        {
            IsolatedStorageSettings isoSettings = IsolatedStorageSettings.ApplicationSettings;
            QuickNotesSettings settings;

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

return settings;
        }
//儲存到本機存放區中
        public void Save()
        {
            IsolatedStorageSettings isoSettings = IsolatedStorageSettings.ApplicationSettings;
            isoSettings["settings"] = this;//儲存的就是這個類的執行個體
        }
    }
}

xaml檔案

<!--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>
<!--縮小-->
<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>

對應的cs後台檔案

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;
        }
//即時儲存記事本的內容到，本機存放區中去
        void OnTextBoxTextChanged(object sender, TextChangedEventArgs args)
        {
            appSettings.Text = txtbox.Text;
        }
//縮小字型
        void OnAppBarSmallerFontClick(object sender, EventArgs args)
        {
            txtbox.FontSize = Math.Max(12, txtbox.FontSize - 1);
            appSettings.FontSize = txtbox.FontSize;
        }
//放大字型
        void OnAppBarLargerFontClick(object sender, EventArgs args)
        {
            txtbox.FontSize = Math.Min(48, txtbox.FontSize + 2);
            appSettings.FontSize = txtbox.FontSize;
        }
    }
}

app.xaml.cs主程式檔案修改

……
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();
        }
……