Sl独立存储使用
独立存储文件存放的位置：C:\Users\lxf\AppData\LocalLow\Microsoft\Silverlight\is\kbpvpqhq.0dm\udt0ydli.0p2\1\s\kzkoq2swcos1sdwaixu3glb2e53lb14li2f21renh5pgxm33bjaaaaaa\f（每个人系统不同，存放位置也不同）
1、键值对
private IsolatedStorageSettings appSettings = IsolatedStorageSettings.ApplicationSettings;
增：
appSettings.Add("email", "someone@contoso.com");
改：
appSettings["email"] = "someone@fabrikam.com";
读：
(string)appSettings["email"];
删：
appSettings.Remove("email");
2、文件
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.IO;
using System.IO.IsolatedStorage;
using System.Collections;
using System.Text;
class Example
{
public static void Demo(TextBlock outputBlock)
{
// Obtain an isolated store for an application.
try
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
// Use a StringBuilder to construct output.
StringBuilder sb = new StringBuilder();
// Create three directories in the root.
store.CreateDirectory("MyApp1");
store.CreateDirectory("MyApp2");
store.CreateDirectory("MyApp3");
// Create three subdirectories under MyApp1.
string subdirectory1 = Path.Combine("MyApp1", "SubDir1");
string subdirectory2 = Path.Combine("MyApp1", "SubDir2");
string subdirectory3 = Path.Combine("MyApp1", "SubDir3");
store.CreateDirectory(subdirectory1);
store.CreateDirectory(subdirectory2);
store.CreateDirectory(subdirectory3);
// Create a file in the root.
IsolatedStorageFileStream rootFile = store.CreateFile("InTheRoot.txt");
rootFile.Close();
// Create a file in a subdirectory.
IsolatedStorageFileStream subDirFile =
store.CreateFile(Path.Combine(subdirectory1, "MyApp1A.txt"));
subDirFile.Close();
// Gather file information
string[] directoriesInTheRoot = store.GetDirectoryNames();
string[] filesInTheRoot = store.GetFileNames();
string searchpath = Path.Combine(subdirectory1, "*.*");
string[] filesInSubDirs = store.GetFileNames(searchpath);
// Find subdirectories within the MyApp1
// directory using the multi character '*' wildcard.
string[] subDirectories =
store.GetDirectoryNames(Path.Combine("MyApp1", "*"));
// List file information
// List the directories in the root.
sb.AppendLine("Directories in root:");
foreach (string dir in directoriesInTheRoot)
{
sb.AppendLine(" - " + dir);
}
sb.AppendLine();
// List the subdirectories under MyApp1.
sb.AppendLine("Directories under MyApp1:");
foreach (string sDir in subDirectories)
{
sb.AppendLine(" - " + sDir);
}
sb.AppendLine();
// List files in the root.
sb.AppendLine("Files in the root:");
foreach (string fileName in filesInTheRoot)
{
sb.AppendLine(" - " + fileName);
}
sb.AppendLine();
// List files in MyApp1\SubDir1.
sb.AppendLine(@"Files in MyApp1\SubDir1:");
foreach (string fileName in filesInSubDirs)
{
sb.AppendLine(" - " + fileName);
}
sb.AppendLine();
// Write to an existing file: MyApp1\SubDir1\MyApp1A.txt
// Determine if the file exists before writing to it.
string filePath = Path.Combine(subdirectory1, "MyApp1A.txt");
if (store.FileExists(filePath))
{
try
{
using (StreamWriter sw =
new StreamWriter(store.OpenFile(filePath,
FileMode.Open, FileAccess.Write)))
{
sw.WriteLine("To do list:");
sw.WriteLine("1. Buy supplies.");
}
}
catch (IsolatedStorageException ex)
{
sb.AppendLine(ex.Message);
}
}
// Read the contents of the file: MyApp1\SubDir1\MyApp1A.txt
try
{
using (StreamReader reader =
new StreamReader(store.OpenFile(filePath,
FileMode.Open, FileAccess.Read)))
{
string contents = reader.ReadToEnd();
sb.AppendLine(filePath + " contents:");
sb.AppendLine(contents);
}
}
catch (IsolatedStorageException ex)
{
sb.AppendLine(ex.Message);
}
// Delete a file.
try
{
if (store.FileExists(filePath))
{
store.DeleteFile(filePath);
}
}
catch (IsolatedStorageException ex)
{
sb.AppendLine(ex.Message);
}
// Delete a specific directory.
string dirDelete = Path.Combine("MyApp1", "SubDir3");
try
{
if (store.DirectoryExists(dirDelete))
{
store.DeleteDirectory(dirDelete);
}
}
catch (IsolatedStorageException ex)
{
sb.AppendLine(ex.Message);
}
sb.AppendLine();
// remove the store
store.Remove();
sb.AppendLine("Store removed.");
outputBlock.Text = sb.ToString();
}
}
catch (IsolatedStorageException)
{
// TODO: Handle that store was unable to be accessed.
}
}
}
// Quota status and increase quota examples
class StoreQuota
{
// Assumes an event handler for the MouseLeftbuttonUp
// event is defined for a control named 'IncreaseQuota'
// In the control's XAML: MouseLeftButtonUp="IncreaseQuota_OnLeftMouseButtonUp"
// User first selects UI to increase the quota.
public void IncreaseQuota_OnClick(object sender, MouseEventArgs e)
{
// Obtain an isolated store for an application.
try
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
// Request 5MB more space in bytes.
Int64 spaceToAdd = 5242880;
Int64 curAvail = store.AvailableFreeSpace;
// If available space is less than
// what is requested, try to increase.
if (curAvail < spaceToAdd)
{
// Request more quota space.
if (!store.IncreaseQuotaTo(store.Quota + spaceToAdd))
{
// The user clicked NO to the
// host's prompt to approve the quota increase.
}
else
{
// The user clicked YES to the
// host's prompt to approve the quota increase.
}
}
}
}
catch (IsolatedStorageException)
{
// TODO: Handle that store could not be accessed.
}
}
public static void ShowIsoStoreStatus(TextBlock inputBlock)
{
// Obtain an isolated store for an application.
try
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
string spaceUsed = (store.Quota - store.AvailableFreeSpace).ToString();
string spaceAvailable = store.AvailableFreeSpace.ToString();
string curQuota = store.Quota.ToString();
inputBlock.Text =
String.Format("Quota: {0} bytes, Used: {1} bytes, Available: {2} bytes",
curQuota, spaceUsed, spaceAvailable);
}
}
catch (IsolatedStorageException)
{
inputBlock.Text = "Unable to access store.";
}
}
}
// This example's Example.Demo method
// produces the following output:
// -----
// Directories in root:
// - MyApp1
// - MyApp2
// - MyApp3
// Directories under MyApp1:
// - SubDir1
// - SubDir2
// - SubDir3
// Files in the root:
// - InTheRoot.txt
// Files in MyApp1\SubDir1:
// - MyApp1A.txt
// MyApp1\SubDir1\MyApp1A.txt contents:
// To do list:
// 1. Buy supplies.
// Store removed.
// -----
