稳扎稳打Silverlight(16) - 2.0数据之独立存储(Isolated Storage)

< UserControl  x:Class ="Silverlight20.Data.IsolatedStorage"

    xmlns ="http://scheR_128_11845@as.microsoft.com/winfx/2006/xaml/presentation"  

    xmlns:x ="http://scheR_128_11845@as.microsoft.com/winfx/2006/xaml" >

     < StackPanel  HorizontalAlignment ="Left" >

         < TextBox  x:Name ="txtmsg"  Margin ="5"   />

         < TextBox  x:Name ="txtmsg2"  Margin ="5"   />

         < Button  x:Name ="increase"  Content ="增加配额"  Click ="increase_Click"  Margin ="5"   />

     </ StackPanel >

</ UserControl >

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  System.IO.IsolatedStorage;

using  System.IO;

namespace  Silverlight20.Data

{

    public partial class IsolatedStorage : UserControl

    

{

        public IsolatedStorage()

        

{

            initializeComponent();

            @H_507_489@//@H_507_489@ 演示 IsolatedStorageFile@H_507_489@

            Demo();

            @H_507_489@//@H_507_489@ 演示 IsolatedStorageSetTings@H_507_489@

            Demo2();

        }

        /**////@H_507_489@ <sumMary>@H_507_489@

        ///@H_507_489@ 演示 IsolatedStorageFile

        ///@H_507_489@ </sumMary>

        void Demo()

        

{

            @H_507_489@//@H_507_489@ Isolated Storage - 独立存储。一个虚拟文件系统

            @H_507_489@//@H_507_489@ IsolatedStorageFile - 操作 独立存储 的类

            @H_507_489@//@H_507_489@     IsolatedStorageFile.GetUserStoreForSite() - 按站点获取用户的独立存储

            @H_507_489@//@H_507_489@     IsolatedStorageFile.GetUserStoreForApplication() - 按应用程序获取用户的独立存储

            

            @H_507_489@//@H_507_489@ using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForSite())@H_507_489@

            using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())

            

{

                @H_507_489@//@H_507_489@ directoryExists(path) - 指定的路径是否存在

                @H_507_489@//@H_507_489@ CreateDirectory(path) - 创建指定的路径

                @H_507_489@//@H_507_489@ FileExists(path) - 指定的文件是否存在

                @H_507_489@//@H_507_489@ CreateFile(path) - 创建指定的文件

                @H_507_489@//@H_507_489@ GetDirectoryNames() - 获取根目录下的目录名数组

                @H_507_489@//@H_507_489@ GetFilenames()() - 获取根目录下的文件名数组

                @H_507_489@//@H_507_489@ GetDirectoryNames(path) - 获取指定目录下的目录名数组

                @H_507_489@//@H_507_489@ GetFilenames(path) - 获取指定目录下的文件名数组

                @H_507_489@//@H_507_489@ OpenFile() - 打开指定的文件。具体参数参看文档

                @H_507_489@//@H_507_489@ deleteFile(path) - 删除指定的文件

                @H_507_489@//@H_507_489@ deleteDirectory(path) - 删除指定的目录（要求目录存在，且目录内无内容）

                @H_507_489@//@H_507_489@ remove() - @L_801_50@ IsolatedStorageFile 对象并移除独立存储内的全部内容

                @H_507_489@//@H_507_489@ 在根目录下创建指定的目录@H_507_489@

                if (!isf.DirectoryExists("Directory01"))

                    isf.CreateDirectory("Directory01");

                if (!isf.DirectoryExists("Directory02"))

                    isf.CreateDirectory("Directory02");

                @H_507_489@//@H_507_489@ 创建指定的子目录@H_507_489@

                String subdirectory01 = System.IO.Path.Combine("Directory01", "subdirectory01");

                String subdirectory02 = System.IO.Path.Combine("Directory01", "subdirectory02");

                if (!isf.DirectoryExists(subdirectory01))

                    isf.CreateDirectory(subdirectory01);

                if (!isf.DirectoryExists(subdirectory02))

                    isf.CreateDirectory(subdirectory02);

                

                @H_507_489@//@H_507_489@ 根目录下创建指定的文件@H_507_489@

                if (!isf.FileExists("RootFile.txt"))

                

{

                    IsolatedStorageFileStream isfs = isf.CreateFile("RootFile01.txt");

                    isfs.Close();

                }

                @H_507_489@//@H_507_489@ 在指定的目录下创建指定的文件@H_507_489@

                String file01 = System.IO.Path.Combine(subdirectory01, "File01.txt");

                String file02 = System.IO.Path.Combine(subdirectory01, "File02.txt");

                String file03 = System.IO.Path.Combine(subdirectory01, "File03.xml");

                if (!isf.FileExists(file01))

                

{

                    @H_507_489@//@H_507_489@ IsolatedStorageFileStream - 独立存储内的文件流。继承自 FileStream@H_507_489@

                    IsolatedStorageFileStream isfs = isf.CreateFile(file01);

                    isfs.Close();

                }

                if (!isf.FileExists(file02))

                

{

                    IsolatedStorageFileStream isfs = isf.CreateFile(file02);

                    isfs.Close();

                }

                if (!isf.FileExists(file03))

                

{

                    IsolatedStorageFileStream isfs = isf.CreateFile(file03);

                    isfs.Close();

                }

                txtmsg.Text += "根目录下的目录列表：/r/n";

                @H_507_489@//@H_507_489@ 获取根目录下的目录名数组@H_507_489@

                foreach (String directoryName in isf.GetDirectoryNames())

                

{

                    txtmsg.Text += directoryName + "/r/n";

                }

                txtmsg.Text += "根目录下的文件列表：/r/n";

                @H_507_489@//@H_507_489@ 获取根目录下的文件名数组@H_507_489@

                foreach (String filename in isf.GetFilenames())

                

{

                    txtmsg.Text += filename + "/r/n";

                }

                txtmsg.Text += "目录 directory01 下的目录列表：/r/n";

                @H_507_489@//@H_507_489@ 获取 directory01 目录下的目录名数组@H_507_489@

                foreach (String directoryName in isf.GetDirectoryNames(subdirectory01))

                

{

                    txtmsg.Text += directoryName + "/r/n";

                }

                txtmsg.Text += "目录 directory01/subdirectory01 下的*.txt文件列表：/r/n";

                @H_507_489@//@H_507_489@ 获取 directory01/subdirectory01 目录下的后缀名为 txt 的文件名数组@H_507_489@

                foreach (String filename in isf.GetFilenames(System.IO.Path.Combine(subdirectory01, "*.txt")))

                

{

                    txtmsg.Text += filename + "/r/n";

                }

                if (isf.FileExists(file01))

                

{

                    @H_507_489@//@H_507_489@ 在文件 file01 中写入内容@H_507_489@

                    IsolatedStorageFileStream streamWrite = isf.openFile(file01, FileMode.open, FileAccess.WritE);

                    using (StreamWriter sw = new StreamWriter(streamWritE))

@H_658_1976@

                    

{

                        sw.WriteLine("我是：webabcd");

                        sw.WriteLine("我专注于asp.net, Silverlight");

                    }

                    txtmsg.Text += "文件 File01.txt 的内容：/r/n";

                    @H_507_489@//@H_507_489@ 读取文件 file01 中的内容@H_507_489@

                    IsolatedStorageFileStream streamRead = isf.openFile(file01, FileAccess.Read);

                    using (StreamReader sr = new StreamReader(streamRead))

                    

{

                        txtmsg.Text += sr.ReadToEnd();

                    }

                }

                @H_507_489@//@H_507_489@ 删除文件 file01@H_507_489@

                if (isf.FileExists(file01))

                

{

                    isf.deleteFile(file01);

                }

                try

                

{

                    @H_507_489@//@H_507_489@ 删除目录 subdirectory01@H_507_489@

                    isf.deleteDirectory(subdirectory01);

                }

                catch (IsolatedStorageException eX)

                

{

                    @H_507_489@//@H_507_489@ IsolatedStorageException - 操作临时存储失败时抛出的异常

                    @H_507_489@//@H_507_489@ 因为 subdirectory01 目录内还有文件，所以会抛异常@H_507_489@

                    txtmsg.Text += ex.message;

                }

            }

        }

        /**////@H_507_489@ <sumMary>@H_507_489@

        ///@H_507_489@ 演示 IsolatedStorageSetTings

        ///@H_507_489@ </sumMary>

        void Demo2()

        

{

            @H_507_489@//@H_507_489@ IsolatedStorageSetTings - 在独立存储中保存的 key-value 字典表

            @H_507_489@//@H_507_489@     IsolatedStorageSetTings.SiteSetTings - 按站点保存的 key-value 字典表

            @H_507_489@//@H_507_489@     IsolatedStorageSetTings.ApplicationSetTings - 按应用程序保存的 key-value 字典表@H_507_489@

            IsolatedStorageSetTings iss = IsolatedStorageSetTings.ApplicationSetTings;

            @H_507_489@//@H_507_489@ Add(key, value) - 添加一对 key-value@H_507_489@

            iss.Add("key", "value");

            txtmsg2.Text += (String)iss["key"] + "/r/n";

            @H_507_489@//@H_507_489@ 修改指定的 key 的 value@H_507_489@

            iss["key"] = "value2";

            txtmsg2.Text += (String)iss["key"] + "/r/n";

            @H_507_489@//@H_507_489@ remove(key) - 移除指定的 key

            @H_507_489@//@H_507_489@ Count - 字典表内的总的 key-value 数@H_507_489@

            iss.Remove("key");

            txtmsg2.Text += iss.Count;

        }

       

        private void increase_Click(object sender, routedEventArgs E)

        

{

            @H_507_489@//@H_507_489@ 演示独立存储的配额的相关操作@H_507_489@

            using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())

            @H_419_2294@

{

                @H_507_489@//@H_507_489@ Quota - 当前配额（KB）

                @H_507_489@//@H_507_489@ IncreaseQuotaTo(newQuotaSizE) - 增加到指定的配额

                @H_507_489@//@H_507_489@ AvailableFreeSpace - 当前的可用配额@H_507_489@

                isf.IncreaseQuotaTo(isf.Quota + 1 * 1024 * 1024);

                System.Windows.browser.HtmlPage.Window.Alert(

                    String.Format("当前配额：{0}；可用配额：{1}", isf.Quota, isf.AvailableFreeSpacE));

            }

        } 

    }

}