public Class.Settings GetSettings()
 {
 if (HttpRuntime.Cache["settings"] != null)
  return (Class.Settings)HttpRuntime.Cache["settings"];
 string rootPath = GetPath();
 #region rootPath
 if (rootPath == "")
 {
  log.Write(MsgType.Fatal, "配置文件根目录rootPath为空");
  return null;
 }
 else
 {
  if (!rootPath.EndsWith("\\"))
  rootPath += "\\";
  rootPath = rootPath + "settings\\settings.config";
 }
 #endregion
 if (!File.Exists(rootPath))
 {
  log.Write(MsgType.Fatal, "配置文件根目录rootPath为空");
  return null;
 }
 string content = File.ReadAllText(rootPath, Encoding.Default);
 Class.Settings model = PublicMethod.XmlSerialize.DeserializeXML<Class.Settings>(content);
 log.Write(MsgType.Information, "读取配置文件");
 CacheDependency cd = new CacheDependency(rootPath);
 HttpRuntime.Cache.Add("settings", model, cd, DateTime.Now.AddMinutes(5), TimeSpan.Zero, CacheItemPriority.High, null);
 return model;
 }

 /// <summary>
 /// 取当前根目录的方法 
 /// </summary>
 private static string GetPath()
 {
 string rootPath = "";
 System.Diagnostics.Process p = System.Diagnostics.Process.GetCurrentProcess();
 //WebDev.WebServer visual studio web server
 //xxx.vhost  Winform
 //w3wp   IIS7
 //aspnet_wp  IIS6
 //iisexpress  vs2013
 string processName = p.ProcessName.ToLower();
 if (processName == "aspnet_wp" || processName == "w3wp" || processName == "webdev.webserver" || processName == "iisexpress")
 {
  if (System.Web.HttpContext.Current != null)
  rootPath = System.Web.HttpContext.Current.Server.MapPath("~/");
  else //当控件在定时器的触发程序中使用时就为空
  {
  rootPath = System.AppDomain.CurrentDomain.BaseDirectory;
  }
 }
 return rootPath;
 }

[XmlRoot(Namespace = "", IsNullable = false, ElementName = "settings")]
public class Settings
{
 #region 属性
 [XmlElement("logger")]
 public LoggerConfig logger { get; set; }
 #endregion
 #region 子类
 [XmlType(TypeName = "logger")]
 public class LoggerConfig
 {
 public string loglevel { get; set; }
 public string savepath { get; set; }
 } 
 #endregion
}

<?xml version='1.0' encoding='utf-8'?>
 <settings>
 <logger>
 <loglevel>0</loglevel>
 <savepath>d:\log</savepath>
 </logger>
<queryurl>http://11.56.254.234:88/shashachaxunserver/shashachaxun</queryurl>
<receiveurl>http://172.16.1.131:88/ThirdPay/ChinaUMS/xml.aspx</receiveurl>
<turnurl>http://172.16.1.131:88/ThirdPay/ChinaUMS/query.aspx</turnurl>
 </chinaums>
 </settings>