IList Webservice 序列化

using System;
using System.Collections;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Serialization;

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service : System.Web.Services.WebService
...{
    public Service () ...{

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [WebMethod]
    public string HelloWorld() ...{
        return "Hello World";
    }

    [WebMethod]
    [XmlInclude(typeof(Article))]  
    public IList GetArticleList()
    ...{
        IList result = new ArrayList();
        for (int i = 0; i < 20; i++)
        ...{
            string title = string.Format("新闻标题-{0}", i);
            string content = string.Format("新闻内容-{0}", i);
            DateTime time = DateTime.Now.AddDays(i);
            result.Add(new Article(title, content, time));
        }
        return result;
    }

   
    public  class Article
    ...{
        private string title;
        private string content;
        private DateTime time;

        public Article()
        ...{
        
        }

        public Article(string title,string content,DateTime time)
        ...{
            this.title = title;
            this.content = content;
            this.time = time;
        }

        public string Title
        ...{
            get ...{ return title; }
            set ...{ title = value; }
        }

        public string Content
        ...{
            get ...{ return content; }
            set ...{ content = value; }
        }

        public DateTime Time
        ...{
            get ...{ return time; }
            set ...{ time = value; }
        }
    }
}