xml格式文件读取（读取网站自定义配置文件）
private static object obj = new object(); private NameValueCollection _system = null; /// <summary> /// 得到系统配置表信息 /// </summary> /// <returns>NameValueCollection 对象</returns> publicNameValueCollection GetSystem() { lock (obj) { if (_system == null) { if (HttpContext.Current == null || HttpContext.Current.Cache == null || HttpContext.Current.Cache["system"] == null) { //read xml string path = AppDomain.CurrentDomain.BaseDirectory + "config\\data.config"; initSystemConfig(); NameValueCollection nvc = new NameValueCollection(); XmlDocument Doc_Detail = new XmlDocument(); Doc_Detail.Load((path)); XmlNodeList NodeList = Doc_Detail.SelectNodes("/root/system/*"); if (NodeList.Count > 0) { for (int i = 0; i < NodeList.Count; i++) { if (NodeList != null) { nvc.Add(NodeList.Name, NodeList.InnerText); } } } _system = nvc; if (HttpContext.Current != null) HttpContext.Current.Cache.Add("system", nvc, new System.Web.Caching.CacheDependency(HttpContext.Current.Server.MapPath("/config/data.config")), System.Web.Caching.Cache.NoAbsoluteExpiration, System.Web.Caching.Cache.NoSlidingExpiration, System.Web.Caching.CacheItemPriority.Default, null); } else { _system = (NameValueCollection)HttpContext.Current.Cache["system"]; } } } return _system; } /// <summary> /// 初始化文件信息 /// </summary> private void initSystemConfig() { string path1 = AppDomain.CurrentDomain.BaseDirectory+"config"; if (!Directory.Exists(path1)) { Directory.CreateDirectory(path1); } string path = AppDomain.CurrentDomain.BaseDirectory+"config\\data.config"; FileInfo CreateFile = new FileInfo(path); //创建文件 if (!CreateFile.Exists) { FileStream FS = CreateFile.Create(); FS.Close(); StreamWriter SW; SW = File.AppendText(path); SW.WriteLine("<?xml version=\"1.0\"?><root><system></system></root>"); SW.Close(); } }//知识点：
//NameValueCollection作为键值对存储数据
//xmlDoc.SelectNodes("/root/system/*"); 以反斜杠"/"分开得到可以 XmlNodeList 列表。
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