这个东西有点象Flash的Cookie,可以用来在客户端存储一些数据，我在官方文档上读到这个功能的第一反应就是:用它来做IM的客户端聊天记录存储太棒了，呵呵
这里把官方文档上的示例精减整理了一下，贴在这里纪念
先引用 using System.IO.IsolatedStorage; using System.IO;
下面的代码展示了，如何在存储区创建目录/文件，以及如何写入文件，读取文件
代码语言：js复制1try
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
StringBuilder sb = new StringBuilder();
//创建主目录
store.CreateDirectory("MainDir1");
//在MainDir1下创建子目录SubDir1
string subdirectory1 = Path.Combine("MainDir1", "SubDir1");
store.CreateDirectory(subdirectory1);
//在SubDir1目录下创建文本文件demo.txt
IsolatedStorageFileStream subDirFile = store.CreateFile(Path.Combine(subdirectory1, "demo.txt"));
subDirFile.Close();
string filePath = Path.Combine(subdirectory1, "demo.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);
}
}
// 读取文件 MainDir1SubDir1demo.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);
}
//删除文件
try
{
if (store.FileExists(filePath))
{
store.DeleteFile(filePath);
}
}
catch (IsolatedStorageException ex)
{
sb.AppendLine(ex.Message);
}
//移除store
store.Remove();
sb.AppendLine("Store removed.");
txtParam.Text = sb.ToString();
}
}
catch (IsolatedStorageException ex)
{
txtParam.Text = ex.Message.ToString();
}存储区的默认大小是100K,如果感觉不够用了，可以用下面的代码向用户申请扩大:
代码语言：js复制// Obtain an isolated store for an application.
try
{
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
// Request 5MB more space in bytes.
Int64 spaceToAdd = 52428800;
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.
}
想知道存储区的空间使用情况吗？
代码语言：js复制// 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();
txtParam.Text =
String.Format("Quota: {0} bytes, Used: {1} bytes, Available: {2} bytes",
curQuota, spaceUsed, spaceAvailable);
}
}
catch (IsolatedStorageException)
{
txtParam.Text = "Unable to access store.";
}
