与众不同 windows phone (6) - Isolated Storage(独立存储)
作者:webabcd
介绍
与众不同 windows phone 7.5 (sdk 7.1) 之独立存储
- 概述
- 独立存储的读/写的Demo
- 读/写 key/value 形式数据到独立存储的快捷方法
示例
1、概述
Summary.xaml
<phone:PhoneApplicationPage x:Class="Demo.IsolatedStorageDemo.Summary" 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" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480" shell:SystemTray.IsVisible="True"> <Grid x:Name="LayoutRoot" Background="Transparent"> <ScrollViewer> <TextBlock TextWrapping="Wrap"> <Run>Isolated Storage 概述</Run> <LineBreak /> <LineBreak /> <Run>通过 IsolatedStorageFile 操作独立存储;通过 IsolatedStorageSettings 可方便地在独立存储中操作 key/value 形式的数据</Run> <LineBreak /> <LineBreak /> <Run>独立存储内的特殊用途的文件夹</Run> <LineBreak /> <Run>1、Shared/Media - 保存专辑封面</Run> <LineBreak /> <Run>2、Shared/ShellContent - 保存 tile 的背景图</Run> <LineBreak /> <Run>3、Shared/Transfers - 用于保存后台传输任务的 上传/下载 数据</Run> <LineBreak /> <LineBreak /> <Run>独立存储资源管理器的使用,该工具在类似如下的地址 C:\Program Files\Microsoft SDKs\Windows Phone\v7.1\Tools\IsolatedStorageExplorerTool\ISETool.exe</Run> <LineBreak /> <Run>1、显示根目录下的目录及文件列表 ISETool.exe dir xd 0fb9e5a3-d4e0-4b0f-b56e-a347bfda0480(id 为 ProductId,可在 WMAppManifest.xml 中找到)</Run> <LineBreak /> <Run>2、显示指定目录下的目录及文件列表 ISETool.exe dir:"Folder" xd 0fb9e5a3-d4e0-4b0f-b56e-a347bfda0480</Run> <LineBreak /> <Run>3、从独立存储复制数据到计算机 ISETool.exe ts xd 0fb9e5a3-d4e0-4b0f-b56e-a347bfda0480 "C:\MyData"(会在此目录下创建一个名为 IsolatedStore 的子目录)</Run> <LineBreak /> <Run>4、从计算机复制数据到独立存储 ISETool.exe rs xd 0fb9e5a3-d4e0-4b0f-b56e-a347bfda0480 "C:\MyData\IsolatedStore"</Run> <LineBreak /> <LineBreak /> <Run>在多线程操作独立存储的场景下,建议使用互斥锁,即 System.Threading.Mutex</Run> <LineBreak /> <LineBreak /> <Run>温馨小提示:appdata:/ 代表程序包内;isostore:/ 代表独立存储。默认为独立存储</Run> </TextBlock> </ScrollViewer> </Grid> </phone:PhoneApplicationPage>
2、演示如何 读/写 独立存储
ReadWriteDemo.xaml
<phone:PhoneApplicationPage x:Class="Demo.IsolatedStorageDemo.ReadWriteDemo" 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" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480" shell:SystemTray.IsVisible="True"> <Grid x:Name="LayoutRoot" Background="Transparent"> <StackPanel Orientation="Vertical"> <TextBlock x:Name="lblMsg" /> <Button x:Name="btnWrite" Content="写入" Click="btnWrite_Click" /> <Button x:Name="btnRead" Content="读取" Click="btnRead_Click" /> </StackPanel> </Grid> </phone:PhoneApplicationPage>
ReadWriteDemo.xaml.cs
/* * Isolated Storage - 独立存储 * * IsolatedStorageFile - 操作 独立存储 的类 * IsolatedStorageFile.GetUserStoreForApplication() - 按应用程序获取用户的独立存储 * * DirectoryExists(path) - 指定的路径是否存在 * CreateDirectory(path) - 创建指定的路径 * FileExists(path) - 指定的文件是否存在 * CreateFile(path) - 创建指定的文件 * GetDirectoryNames() - 获取根目录下的目录名数组 * GetFileNames()() - 获取根目录下的文件名数组 * GetDirectoryNames(path) - 获取指定目录下的目录名数组 * GetFileNames(path) - 获取指定目录下的文件名数组 * GetCreationTime(path) - 返回指定文件夹或文件的创建时间 * GetLastAccessTime(path) - 返回指定文件夹或文件最近一次被访问的时间 * GetLastWriteTime(path) - 返回指定文件夹或文件最近一次被写入内容的时间 * OpenFile() - 打开指定的文件。具体参数参看文档 * CopyFile(String, String, Boolean) - 复制文件,可以指定是否覆盖已有文件 * MoveDirectory() - 移动文件夹 * MoveFile() - 移动文件 * DeleteFile(path) - 删除指定的文件 * DeleteDirectory(path) - 删除指定的目录(要求目录存在,且目录内无内容) * Remove() - 关闭 IsolatedStorageFile 对象并移除独立存储内的全部内容 * * AvailableFreeSpace - 独立存储目前的可用空间 * Quota - 配额,即程序上允许的最大可用空间(wp7中这个属性没什么用,因为没有配额限制) * IncreaseQuotaTo() - 请求允许一个更大的配额(wp7中这个属性没什么用,因为没有配额限制) */ 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.IsolatedStorage; using System.IO; namespace Demo.IsolatedStorageDemo { public partial class ReadWriteDemo : PhoneApplicationPage { public ReadWriteDemo() { InitializeComponent(); this.Loaded += new RoutedEventHandler(TextReadWrite_Loaded); } void TextReadWrite_Loaded(object sender, RoutedEventArgs e) { IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication(); lblMsg.Text = "可用空间:" + isf.AvailableFreeSpace / 1024 / 1024 + "MB"; } private void btnWrite_Click(object sender, RoutedEventArgs e) { IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication(); isf.CreateDirectory("Folder"); // IsolatedStorageFileStream - 独立存储内的文件流。继承自 FileStream using (var isfs = new IsolatedStorageFileStream(@"Folder\File.txt", FileMode.OpenOrCreate, isf)) { using (var sw = new StreamWriter(isfs)) { sw.WriteLine("hello webabcd"); } } } private void btnRead_Click(object sender, RoutedEventArgs e) { IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication(); try { // IsolatedStorageFileStream - 独立存储内的文件流。继承自 FileStream using (var isfs = new IsolatedStorageFileStream(@"Folder\File.txt", FileMode.Open, isf)) { using (var sr = new StreamReader(isfs)) { MessageBox.Show(sr.ReadLine()); } } } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } } }
3、演示读/写 key/value 形式数据到独立存储的快捷方法
IsolatedStorageSettingsDemo.xaml
<phone:PhoneApplicationPage x:Class="Demo.IsolatedStorageDemo.IsolatedStorageSettingsDemo" 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" FontFamily="{StaticResource PhoneFontFamilyNormal}" FontSize="{StaticResource PhoneFontSizeNormal}" Foreground="{StaticResource PhoneForegroundBrush}" SupportedOrientations="Portrait" Orientation="Portrait" mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480" shell:SystemTray.IsVisible="True"> <Grid x:Name="LayoutRoot" Background="Transparent"> <StackPanel Orientation="Vertical"> <Button x:Name="btnWrite" Content="写入" Click="btnWrite_Click" /> <Button x:Name="btnRead" Content="读取" Click="btnRead_Click" /> </StackPanel> </Grid> </phone:PhoneApplicationPage>
IsolatedStorageSettingsDemo.xaml.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.IsolatedStorage; namespace Demo.IsolatedStorageDemo { public partial class IsolatedStorageSettingsDemo : PhoneApplicationPage { public IsolatedStorageSettingsDemo() { InitializeComponent(); } private void btnWrite_Click(object sender, RoutedEventArgs e) { /* * IsolatedStorageSettings - 用非常方便的方法在独立存储中保存 key/value 形式的数据 * IsolatedStorageSettings.ApplicationSettings - 按应用程序保存 key/value 数据 * * IsolatedStorageSettings 实现的接口有:IDictionary<string, object>, ICollection<KeyValuePair<string, object>>, IEnumerable<KeyValuePair<string, object>>, IDictionary, ICollection, IEnumerable */ IsolatedStorageSettings iss = IsolatedStorageSettings.ApplicationSettings; // 用这种方法保存 key/value 形式的数据非常简单 iss["abc"] = "webabcd"; // 保存 IsolatedStorageSettings 数据,但是经过测试,即使不调用此方法,数据也会被保存。但是为了保险还是调用一下 Save() 比较好 iss.Save(); } private void btnRead_Click(object sender, RoutedEventArgs e) { IsolatedStorageSettings iss = IsolatedStorageSettings.ApplicationSettings; // 用这种方法读取 key/value 形式的数据非常简单 if (iss.Contains("abc")) MessageBox.Show((string)iss["abc"]); } } }
OK
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