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【WP8】自定义配置存储类
之前在WP7升级到WP8的时候遇到配置不兼容的问题
情景：之前只有一个WP7版本，现在需要发布WP8版本，让用户可以从原来的WP7版本升级到WP8版本
一般情况下从WP7升级到WP8没什么问题
但是在项目中升级到WP8的时候，原先在WP7下保存在IsolatedStorageSettings的数据都不出来，经过调试发现
1、IsolatedStorageSettings存放数据的隔离存储控件的"__ApplicationSettings"文件中，存放的格式如下 {"test":"TestData"}
<ArrayOfKeyValueOfstringanyType xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays"> <KeyValueOfstringanyType> <Key>test</Key> <Value xmlns:d3p1="http://www.w3.org/2001/XMLSchema" i:type="d3p1:string">TestData</Value> </KeyValueOfstringanyType></ArrayOfKeyValueOfstringanyType>
2、但是原来的项目中使用了友盟WP7版本，后来的项目中使用的是WP8版本，友盟会向"__ApplicationSettings"文件中写入数据，如下：
UmengSDK.Business.OnlineConfigManager+OnlineConfig, UmengAnalyticsWP7, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null<ArrayOfKeyValueOfstringanyType xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays"> <KeyValueOfstringanyType> <Key>test</Key> <Value xmlns:d3p1="http://www.w3.org/2001/XMLSchema" i:type="d3p1:string">TestData</Value> </KeyValueOfstringanyType> <KeyValueOfstringanyType> <Key>device_id</Key> <Value xmlns:d3p1="http://www.w3.org/2001/XMLSchema" i:type="d3p1:string">0BBB2DF41DD5688A25517F2968339DC0</Value> </KeyValueOfstringanyType> <KeyValueOfstringanyType> <Key>wp_device</Key> <Value xmlns:d3p1="http://www.w3.org/2001/XMLSchema" i:type="d3p1:string">1C43AC07795C55C2ADA78B0DD5A79B3660A7D137</Value> </KeyValueOfstringanyType> <KeyValueOfstringanyType> <Key>config</Key> <Value xmlns:d3p1="http://schemas.datacontract.org/2004/07/UmengSDK.Business" i:type="d3p1:OnlineConfigManager.OnlineConfig"> <d3p1:Interval>30</d3p1:Interval> <d3p1:LastConfigTime>Wed Jul 02 00:43:35 CST 2014</d3p1:LastConfigTime> <d3p1:Policy>BATCH_AT_LAUNCH</d3p1:Policy> </Value> </KeyValueOfstringanyType></ArrayOfKeyValueOfstringanyType>
3、而上面数据到了WP8上就不能正常读取原来存放的数据（如果在WP8项目中用WP7版的友盟则可以正常读取），导致原来存放的其他信息也读取不出来
4、下面试图自定义一个与 IsolatedStorageSettings 功能类似的类用于小数据的存取，避免第三方类库对"__ApplicationSettings"文件的修改导致一些兼容性问题
IsolatedStorageSettings 存放的是键值对，也就是字典模型，我们需要把Dictionary序列化到文件中，但是Dictionary不支持直接序列化，先对Dictionary进行扩展，让其支持序列化
using System;using System.Collections.Generic;using System.Xml;using System.Xml.Schema;using System.Xml.Serialization;namespace XTuOne.Common.Helpers{ /// <summary> /// 可序列化的Dictionary /// </summary> [XmlRoot("Dictionary")] public class SerializableDictionary<TKey, TValue> : Dictionary<TKey, TValue>, IXmlSerializable { #region 构造函数，调用基类的构造函数 public SerializableDictionary() { } public SerializableDictionary(IDictionary<TKey, TValue> dictionary) : base(dictionary) { } public SerializableDictionary(IEqualityComparer<TKey> comparer) : base(comparer) { } public SerializableDictionary(int capacity) : base(capacity) { } public SerializableDictionary(int capacity, IEqualityComparer<TKey> comparer) : base(capacity, comparer) { } public SerializableDictionary(IDictionary<TKey, TValue> dictionary, IEqualityComparer<TKey> comparer) : base(dictionary, comparer) { } #endregion #region IXmlSerializable 接口的实现 public XmlSchema GetSchema() { throw new NotImplementedException(); } /// <summary> /// 从对象的XML表示形式生成该对象 /// </summary> /// <param name="reader"></param> public void ReadXml(XmlReader reader) { var keySerializer = new XmlSerializer(typeof (TKey)); var valueSerializer = new XmlSerializer(typeof (TValue)); bool wasEmpty = reader.IsEmptyElement; reader.Read(); if (wasEmpty) return; while (reader.NodeType != XmlNodeType.EndElement) { reader.ReadStartElement("Key"); TKey key = (TKey) keySerializer.Deserialize(reader); reader.ReadEndElement(); reader.ReadStartElement("Value"); TValue value = (TValue) valueSerializer.Deserialize(reader); reader.ReadEndElement(); this.Add(key, value); reader.MoveToContent(); } reader.ReadEndElement(); } /// <summary> /// 将对象转换为其XML表示形式 /// </summary> /// <param name="writer"></param> public void WriteXml(XmlWriter writer) { var keySerializer = new XmlSerializer(typeof (TKey)); var valueSerializer = new XmlSerializer(typeof (TValue)); foreach (TKey key in this.Keys) { writer.WriteStartElement("Key"); keySerializer.Serialize(writer, key); writer.WriteEndElement(); writer.WriteStartElement("Value"); TValue value = this[key]; valueSerializer.Serialize(writer, value); writer.WriteEndElement(); } } #endregion }}
5、使用系统的Xml序列化功能保存数据
using System;using System.IO;using System.IO.IsolatedStorage;using System.Windows;using System.Xml.Linq;using System.Xml.Serialization;namespace XTuOne.Common.Helpers{ public class XmlHelper { private XmlHelper() { } /// <summary> /// 序列化对象到文件 /// </summary> /// <param name="file">文件路径："/test.xml"</param> /// <param name="obj"></param> public static void Serialize<T>(string file, T obj) { using (var sf = IsolatedStorageFile.GetUserStoreForApplication()) { using (var fs = new IsolatedStorageFileStream(file, FileMode.OpenOrCreate, FileAccess.Write, sf)) { var serializer = new XmlSerializer(obj.GetType()); serializer.Serialize(fs, obj); } } } /// <summary> /// 反序列化文件到对象 /// </summary> /// <typeparam name="T"></typeparam> /// <param name="file">文件路径："/test.xml"</param> public static T Deserialize<T>(string file) { using (var sf = IsolatedStorageFile.GetUserStoreForApplication()) { var serializer = new XmlSerializer(typeof(T)); using (var fs = sf.OpenFile(file, FileMode.Open, FileAccess.Read)) { return (T)serializer.Deserialize(fs); } } } /// <summary> /// 读取配置文件的信息 /// </summary> /// <param name="file">前面不加/</param> /// <param name="node">用.隔开（例如App.Version）</param> /// <param name="attribute"></param> public static string GetConfigValue(string file,string node, string attribute) { var configFile = Application.GetResourceStream(new Uri(file, UriKind.Relative)); return GetXmlValue(configFile.Stream, node, attribute); } private static string GetXmlValue(Stream stream, string node, string attribute) { var configDoc = XDocument.Load(stream); XElement temp = null; foreach (var n in node.Split(‘.‘)) { if (temp == null) { temp = configDoc.Element(n); continue; } temp = temp.Element(n); } if (temp == null) { throw new NullReferenceException(); } return temp.Attribute(attribute).Value; } }}
// *************************************************// // 作者：bomo// 小组：WP开发组// 创建日期：2014/6/21 14:55:56// 版本号：V1.00// 说明:// // *************************************************// // 修改历史: // Date WhoChanges Made // 2014/6/21 14:55:56 bomo Initial creation //// *************************************************using System.IO.IsolatedStorage;namespace XTuOne.Common.Helpers{ /// <summary> /// 自定义应用程序配置（相当于IsolatedStorageSetting） /// </summary> public class ApplicationSetting { /// <summary> /// 保存配置的文件名 /// </summary> private const string SETTING_FILE = "XTuOneSetting"; private static SerializableDictionary<string, object> dictionary; #region 单例 private static ApplicationSetting current; private static readonly object lockObj = new object(); private ApplicationSetting() { //读取配置 using (var sf = IsolatedStorageFile.GetUserStoreForApplication()) { dictionary = sf.FileExists(SETTING_FILE) ? XmlHelper.Deserialize<SerializableDictionary<string, object>>(SETTING_FILE) : new SerializableDictionary<string, object>(); } } public static ApplicationSetting Current { get { if (current == null) { lock (lockObj) { if (current == null) { current = new ApplicationSetting(); } } } return current; } } #endregion /// <summary> /// 通过索引赋值需要显式保存 /// </summary> public object this[string key] { get { return Contains(key) ? dictionary[key] : null; } set { dictionary[key] = value.ToString(); } } public T Get<T>(string key) { return (T) dictionary[key]; } /// <summary> /// 通过键获取值，如果不存在，则返回传入的默认值 /// </summary> public T Get<T>(string key, T defaultValue) { return dictionary.ContainsKey(key) ? (T) dictionary[key] : defaultValue; } /// <summary> /// 设置值，自动保存 /// </summary> public void Set(string key, object value) { if (dictionary.ContainsKey(key)) { dictionary[key] = value; } else { dictionary.Add(key, value); } Save(); } /// <summary> /// 保存配置到文件 /// </summary> public void Save() { XmlHelper.Serialize(SETTING_FILE, dictionary); } /// <summary> /// 判断是否包含键 /// </summary> public bool Contains(string key) { return dictionary.ContainsKey(key); } /// <summary> /// 析构时保存数据 /// </summary> ~ApplicationSetting() { Save(); } }}
使用自定义的配置管理器可以控制文件信息，不会出现上述与第三方类库的一些兼容性问题（当然，这种情况比较少）
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