silverlight的独立存储
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;
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try
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{
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using (var store = IsolatedStorageFile.GetUserStoreForApplication())
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{
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StringBuilder sb = new StringBuilder();
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//创建主目录
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store.CreateDirectory("MainDir1");
9![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
10![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//在MainDir1下创建子目录SubDir1
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string subdirectory1 = Path.Combine("MainDir1", "SubDir1");
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store.CreateDirectory(subdirectory1);
14![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
15![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//在SubDir1目录下创建文本文件demo.txt
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IsolatedStorageFileStream subDirFile = store.CreateFile(Path.Combine(subdirectory1, "demo.txt"));
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subDirFile.Close();
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string filePath = Path.Combine(subdirectory1, "demo.txt");
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if (store.FileExists(filePath))
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{
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try
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{
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using (StreamWriter sw = new StreamWriter(store.OpenFile(filePath, FileMode.Open, FileAccess.Write)))
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{
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sw.WriteLine("To do list:");
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sw.WriteLine("1. Buy supplies.");
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}
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}
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catch (IsolatedStorageException ex)
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{
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sb.AppendLine(ex.Message);
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}
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}
36![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// 读取文件 MainDir1\SubDir1\demo.txt
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try
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{
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using (StreamReader reader = new StreamReader(store.OpenFile(filePath,FileMode.Open, FileAccess.Read)))
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{
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string contents = reader.ReadToEnd();
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sb.AppendLine(filePath + " contents:");
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sb.AppendLine(contents);
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}
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}
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catch (IsolatedStorageException ex)
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{
49![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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sb.AppendLine(ex.Message);
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}
52![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//删除文件
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try
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{
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if (store.FileExists(filePath))
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{
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store.DeleteFile(filePath);
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}
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}
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catch (IsolatedStorageException ex)
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{
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sb.AppendLine(ex.Message);
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}
65![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
66![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//移除store
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store.Remove();
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sb.AppendLine("Store removed.");
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txtParam.Text = sb.ToString();
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}
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}
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catch (IsolatedStorageException ex)
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{
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txtParam.Text = ex.Message.ToString();
78![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
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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:
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// Obtain an isolated store for an application.
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try
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{
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using (var store = IsolatedStorageFile.GetUserStoreForApplication())
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{
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// Request 5MB more space in bytes.
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Int64 spaceToAdd = 52428800;
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Int64 curAvail = store.AvailableFreeSpace;
9![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// If available space is less than
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// what is requested, try to increase.
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if (curAvail < spaceToAdd)
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{
14![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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// Request more quota space.
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if (!store.IncreaseQuotaTo(store.Quota + spaceToAdd))
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{
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// The user clicked NO to the
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// host's prompt to approve the quota increase.
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}
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else
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{
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// The user clicked YES to the
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// host's prompt to approve the quota increase.
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}
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}
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}
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}
29![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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catch (IsolatedStorageException)
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{
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// TODO: Handle that store could not be accessed.
33![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
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想知道存储区的空间使用情况吗?
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// Obtain an isolated store for an application.
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try
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{
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using (var store = IsolatedStorageFile.GetUserStoreForApplication())
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{
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string spaceUsed = (store.Quota - store.AvailableFreeSpace).ToString();
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string spaceAvailable = store.AvailableFreeSpace.ToString();
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string curQuota = store.Quota.ToString();
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txtParam.Text =
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String.Format("Quota: {0} bytes, Used: {1} bytes, Available: {2} bytes",
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curQuota, spaceUsed, spaceAvailable);
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}
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}
14![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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catch (IsolatedStorageException)
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{
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txtParam.Text = "Unable to access store.";
18![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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}
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作者:菩提树下的杨过
出处:http://yjmyzz.cnblogs.com
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。
出处:http://yjmyzz.cnblogs.com
本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。