silverlight IsolatedStorageFile 创建及操作xml

//记得添加xml  xml.Linq的引用哦using System;using System.IO;using System.Net;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Ink;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using System.Collections.Generic;using System.IO.IsolatedStorage;using System.Xml;using System.Xml.Linq;namespace XmlMemoryDemo{    public class MemoryOper    {                private static string strXml =        @"<?xml version=""1.0"" encoding=""utf-8""?>            <projects>                <name>value</name>            </projects>";        /// <summary>        /// 判断文件是否存在        /// </summary>        private static bool existFille(string path)        {            using (var isoFile = IsolatedStorageFile.GetUserStoreForApplication())            {                if (isoFile.FileExists(path))                {                    return true;                }                return false;            }        }        /// <summary>        /// 判断节点是否存在        /// </summary>        private static bool exitsNode(string path, string name, string value)        {            List<MemoryNode> nodes = getNodes(path);            MemoryNode node = new MemoryNode(name, path);            if (nodes.Contains(node))            {                return true;            }            return false;        }        /// <summary>        /// 创建文件        /// </summary>        /// <param name="path"></param>        private static void createFile(string path)        {            if (!existFille(path))            {                using (var isoFile = IsolatedStorageFile.GetUserStoreForApplication())                {                    using (var stream = new IsolatedStorageFileStream(path, FileMode.Create, isoFile))                    {                        using (var writer = new StreamWriter(stream))                        {                            writer.WriteLine(strXml);                            writer.Close();                        }                        stream.Close();                    }                }            }        }        /// <summary>        /// 返回所有节点        /// </summary>        private static List<MemoryNode> getNodes(string path)        {            createFile(path);            using (var isoFile = IsolatedStorageFile.GetUserStoreForApplication())            {                using (var stream = new IsolatedStorageFileStream(path, FileMode.Open, isoFile))                {                    XmlReader reader = XmlReader.Create(stream);                    XDocument xDoc = XDocument.Load(reader);                    XElement Root = xDoc.Root;                    List<MemoryNode> results = new List<MemoryNode>();                    foreach (XElement ele in Root.Elements())                    {                        MemoryNode result = new MemoryNode(ele.Name.ToString(), ele.Value.ToString());                        results.Add(result);                    }                    stream.Close();                    return results;                }            }        }        /// <summary>        /// 通过名称获得value        /// </summary>        public static string getValue(string path, string name)        {            List<MemoryNode> nodes = getNodes(path);            foreach(MemoryNode node in nodes)            {                if (node.name.Equals(name))                {                    return node.value;                }            }            return "";        }        /// <summary>        /// 添加节点        /// </summary>        public static void addNode(string path,string name, string value)        {            createFile(path);            if (exitsNode(path,name,value))            {                updateNode(path, name, value);//已经存在的节点更新即可                return;            }            using (var isoFile = IsolatedStorageFile.GetUserStoreForApplication())            {                XDocument xdoc=null;                using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(path, FileMode.Open, isoFile))                {                    XElement newElement = new XElement(name, value);                    xdoc=XDocument.Load(isoStream);                    xdoc.Root.Add(newElement);                }                using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(path, FileMode.Truncate, FileAccess.Write, isoFile))                {                    using (StreamWriter sw = new StreamWriter(isoStream, System.Text.Encoding.UTF8))                    {                        xdoc.Save(sw);                    }                }            }        }        /// <summary>        /// 更新节点        /// </summary>        private static void updateNode(string path, string name, string value)        {            createFile(path);            using (var isoFile = IsolatedStorageFile.GetUserStoreForApplication())            {                XDocument xdoc = null;                using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(path, FileMode.Open, isoFile))                {                    XElement newElement = new XElement(name, value);                    xdoc = XDocument.Load(isoStream);                    XElement root = xdoc.Root;                    foreach (XElement ele in root.Elements())                    {                        if (ele.Name.ToString().Equals(name))                        {                            ele.Remove();                        }                    }                    xdoc.Root.Add(new XElement(name, value));                                        /*                    foreach (XElement ele in root.Elements())                    {                        if (ele.Name.ToString().Equals(name))                        {                            ele.Remove();                        }                    }                    xdoc.Root.Add(new XElement(name, value));                   */                    /*                    foreach (XElement ele in root.Elements())                    {                        if (ele.Name.ToString().Equals(name))                        {                            ele.ReplaceWith(new XElement(name, value));                        }                    }                     */                                     }                using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream(path, FileMode.Truncate, FileAccess.Write, isoFile))                {                    using (StreamWriter sw = new StreamWriter(isoStream, System.Text.Encoding.UTF8))                    {                        xdoc.Save(sw);                    }                }            }        }    }    /// <summary>    /// 记录节点信息的类 重写了Equals方法    /// </summary>    public class MemoryNode    {        public string name { set; get; }        public string value { set; get; }        public MemoryNode(string name, string value)        {            this.name = name;            this.value = value;        }        public override bool Equals(Object node)        {            if (node == null)            {                return false;            }            MemoryNode newNode = (MemoryNode)node;            if(this.name.Equals(newNode.name))            {                return true;            }            return false;                    }           }}