在Windows服务里面,如果访问文件,采用绝对路径可以.如果采用相对路径,和生成的服务文件在同一目录下面.则要访问此程序集 下面的文件.

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Xml;
using System.IO;
namespace HDUSearch
...{
public  class IndexConfig
...{
GetValue#region GetValue
public string GetValue(string key)
...{
string assemblyFilePath = Assembly.GetExecutingAssembly().Location;
string assemblyDirPath = Path.GetDirectoryName(assemblyFilePath);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(assemblyDirPath + "\Index.config");
XmlNodeList nodeList = xmlDoc.SelectSingleNode("/configuration/appSettings").ChildNodes;   //获取appSettings节点的所有子节点   
           foreach (XmlNode xn in nodeList)   //遍历所有子节点   
           ...{
XmlElement xe = (XmlElement)xn;   //将子节点类型转换为XmlElement类型   
               if (xe.GetAttribute("key").IndexOf(key) != -1)
...{
return xe.GetAttribute("value");
break;
}
}
return "";
}
#endregion
}
}