用自定义的节回扩展web.config和machine.config配置文件的结构

webconfig:

<?xml version="1.0"?>
<!--
  有关如何配置 ASP.NET 应用程序的详细信息，请访问
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
	<configSections>
		<section name="RemotingObject" type="RemotingObject"/>
	</configSections>
	<system.web>
		<compilation debug="true" targetFramework="4.0"/>
	</system.web>
	<RemotingObject available="true" pollTimeout="00:01:00" location="tcp://OrderComputer:8010/OrderService"/>
</configuration>

 获取自定义节点 内容：

        //打开配置文件
        Configuration config = WebConfigurationManager.OpenWebConfiguration("~/");
        //获取配置节对象
        RemotingObject custSection =
        (RemotingObject)config.GetSection("RemotingObject");
        //显示配置节信息
        lblInfo.Text += "获取自定义配置节的信息...<br />" +
        "<b>位置:</b> " + custSection.Location +
        "<br /><b>是否可用:</b> " + custSection.Available.ToString() +
        "<br /><b>超时时间:</b> " + custSection.PollTimeout.ToString() + "<br /><br />";

RemotingObject对象类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Configuration;

/// <summary>
///RemotingObject 的摘要说明
/// </summary>
public class RemotingObject : ConfigurationSection
{
    //定义远程对象是否可用
    [ConfigurationProperty("available", IsRequired = false, DefaultValue = true)]
    public bool Available
    {
        get { return (bool)base["available"]; }
        set { base["available"] = value; }
    }
    //定义远程对象的超时时间
    [ConfigurationProperty("pollTimeout", IsRequired = true)]
    public TimeSpan PollTimeout
    {
        get { return (TimeSpan)base["pollTimeout"]; }
        set { base["pollTimeout"] = value; }
    }
    //定义远程对象所在的位置
    [ConfigurationProperty("location", IsRequired = true)]
    public string Location
    {
        get { return (string)base["location"]; }
        set { base["location"] = value; }
    }
}