<?xml version="1.0" encoding="utf-8"?>
<connectionStrings><add name="SDbContext" connectionString="Server=.;Initial Catalog=Self;User ID=sa;Password=password" providerName="System.Data.SqlClient" /></connectionStrings>

<?xml version="1.0" encoding="utf-8"?>
<appSettings><!-- ================== 1：开发系统相关配置 ================== --><!-- 登陆提供者模式：Session、Cookie--><add key="LoginProvider" value="Cookie" /><!-- 启用系统日志--><add key="IsLog" value="true" /><!-- 数据库超时间--><add key="CommandTimeout" value="180" /><!--启用IP过滤 --><add key="IsIPFilter" value="false" /><!-- ================== 2：系统软件参数配置 ================== --><!-- 联系我们 --><add key="Contact" value="TE Software(Mobility)" /><!-- 软件名称 --><add key="SoftName" value="Sub Self" /><!-- 软件版本 --><add key="Version" value="1.0" /><!-- 设置就应用路径 --><add key="AppName" value="" /><!-- 设置就应用路径 --><add key="SqlGetBomList" value="" />
</appSettings>

<configSections><section name="users" type="System.Configuration.NameValueSectionHandler"/></configSections><users  configSource="users.config"></users>

<users><add key="beijing" value="123"></add><add key="tianjin" value="123"></add>
</users>

NameValueCollection users = System.Configuration.ConfigurationManager.GetSection("users") as NameValueCollection;//   Response.Write(users.Keys[0]+"</br>"+users.Keys[1]);
users.Get("beijing");

<configSections><section name="roles" type="EBuy.Chapter3.NTier.WebUI.RolesConfig, EBuy.Chapter3.NTier.WebUI"/></configSections>
<roles configSource="roles.config"></roles>

<roles><add username="beijing" password="123"></add><add username="tianjin" password="123"></add>
</roles>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace EBuy.Chapter3.NTier.WebUI
{public class RolesConfig : System.Configuration.IConfigurationSectionHandler{public object Create(object parent, object configContext, System.Xml.XmlNode section){return section;}}
}XmlNode roles= System.Configuration.ConfigurationManager.GetSection("roles") as XmlNode;Response.Write(roles.ChildNodes [0].Attributes["username"].InnerText);

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace EBuy.Chapter3.NTier.WebUI
{public class RolesConfig : System.Configuration.IConfigurationSectionHandler{public object Create(object parent, object configContext, System.Xml.XmlNode section){var list=new List<Role>();for(int i=0;i<section.ChildNodes.Count;i++){list.Add(new Role (){Username =section.ChildNodes[i].Attributes["username"].InnerText ,Password =section.ChildNodes[i].Attributes["password"].InnerText });}return list;}}public class Role{public string Username { get; set; }public string Password{get;set;}}
}var roles = System.Configuration.ConfigurationManager.GetSection("roles") as List<EBuy.Chapter3.NTier.WebUI.Role >;Response.Write(roles.First ().Username);