using System;using System.Configuration;namespace ConsoleApplication3{    /*        web.config 或 app.config 中的配置示例如下（注：configSections 节一定要是 configuration 节下的第一个元素）：             
             
                 
                      
       
            
                      
                      
                   
              
          */    public class EasConfigurationElement : ConfigurationElement    {        [ConfigurationProperty("name", IsKey=true, IsRequired=true)]        public string Name        {            get { return (string)this["name"]; }            set { this["name"] = value; }        }        [ConfigurationProperty("url", DefaultValue = "")]        public string Url        {            get { return (string)this["url"]; }            set { this["url"] = value; }        }        [ConfigurationProperty("port", DefaultValue = 0, IsRequired = false)]        [IntegerValidator(MinValue = 0, MaxValue = 8080, ExcludeRange = false)]        public int Port        {            get { return (int)this["port"]; }            set { this["port"] = value; }        }    }    [ConfigurationCollection(typeof(EasConfigurationElement))]    public class EasConfigurationElementCollection : ConfigurationElementCollection    {        protected override string ElementName        {            get            {                return "url";            }        }        public override ConfigurationElementCollectionType CollectionType        {            get { return ConfigurationElementCollectionType.BasicMap; }        }        protected override ConfigurationElement CreateNewElement()        {            return new EasConfigurationElement();        }        protected override object GetElementKey( ConfigurationElement element )        {            var newElement = element as EasConfigurationElement;            if( newElement != null ) return newElement.Name;            throw new NullReferenceException( "element can not convert to " + typeof( EasConfigurationElement ) );        }        public EasConfigurationElement this[ int index ]        {            get { return (EasConfigurationElement)BaseGet( index ); }            set            {                if( BaseGet( index ) != null )                {                    BaseRemoveAt( index );                }                BaseAdd( index, value );            }        }    }    public class EasConfigurationSection : ConfigurationSection    {        [ConfigurationProperty("", IsDefaultCollection = true)]        public EasConfigurationElementCollection Urls        {            get            {                var collection = (EasConfigurationElementCollection)base[""];                return collection;            }        }    }}