在 HTML 5 中等效的 Silverlight 本地存储

Question

我想将配置存储在每个设备（而不是每个浏览器）的客户端计算机上，并在所有支持 HTML 5 的浏览器中访问它。我可以使用 Silverlight 的 Isolated Storage 存储此配置，所有带有此插件的浏览器都可以读取它。我看到（我的理解）以下 HTML 5 技术的缺点

本地存储：Data will be deleted if user clears cache
索引数据库：Data won't be shared across browsers
文件 API：Can't read any arbitrary file without permission of user. 用户可能必须拖放文件才能读取它，我将在文件中存储一些配置，所以我不希望用户拖放文件每次我想阅读配置

是否有任何项目可以帮助我，或者我可以在这种情况下使用一些“设计模式”？
我应该查看 HTML 5 之外的内容吗？

经历了以下没有成功： https://softwareengineering.stackexchange.com/questions/156682/how-to-move-silverlight-app-to-html5 https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills http://www.manasinc.com/silverlight-and-html5-comparison/

Answer 1

如果用户清除缓存，则无法持久保存数据，甚至接近的唯一方法是将数据存储在服务器端（与用户配置文件相关），然后在应用程序连接和发送参数时（如用户代理和屏幕资源）将特定配置重新下载到缓存中。

此外，我怀疑是否有一种方法可以实现与每个 Web 浏览器的完全兼容（与大多数情况一样），但是就存储而言，Web 存储是与当前浏览器最兼容的方法。 http://caniuse.com/#feat=namevalue-storage

Answer 2

// To save (Silverlight Out of browser)
// This code is used when you have a Silvelight runs out of browser and typical local storage won't work, you can create an xml file saved on local c drive and retrieve that data when restarting the app.

XDocument doc = new XDocument(
                new XElement("Root",
                    new XElement("userinit", "john doe")
                ));
string path = "C:\\Windows\\Temp\\setup.xml";
using (StreamWriter writetext = new StreamWriter(path))
{
    doc.Save(writext);
}    

// to read, read the same file you save to the saved setup
string path = "C:\\Windows\\Temp\\setup.xml";
//<?xml version="1.0" encoding="utf-8"?>
//<Root>
//    <userinit>john doe</userinit>
//</Root>
// from the xml you can extract your saved data
string result = sting.Empty;
if (File.Exists(path))
{
    System.IO.StreamReader read = new StreamReader(path);
    result = read.ReadToEnd();
}

Answer 3

// for in browser app
// to save 
// you can create a local storage file in the form of xml
// this file will persist as long as you don't clear the browsing history
XDocument doc = new XDocument(
            new XElement("Root",
                new XElement("userinit", "john doe")
            ));
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
    using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream("setup.xml", FileMode.Create, isoStore))
    {
        doc.Save(isoStream);
    }
}
// to read
// the saved xml will be
//<Root><userinit>john doe</userinit></Root>
// you can extract data from there
// 
string lineOfData = String.Empty;
using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
{
    if (!isf.FileExists("setup.xml"))
        return;
     using (IsolatedStorageFileStream isfs = new IsolatedStorageFileStream("setup.xml", FileMode.Open, isf))
        {
            using (StreamReader sr = new StreamReader(isfs))
            {

                lineOfData  = sr.ReadToEnd();
            }
       }
 }

// get the data from xml
string initials;
XDocument xdoc = XDocument.Parse(lineOfData);
var q = (from c in xdoc.Descendants("userinit")
                     select c).Single();
            _Initial = q.Value;
            initials = _Initial;