WCF中的服务和ASP.NET AJAX中的WebService

WCF的架构：using System.ServiceModel;
契约:Contract
[ServiceContract]
public partial interface IContract
{
        [OperationContract]
        string DocumentWebHostUrl();
}
服务：Service
[ServiceBehavior(IncludeExceptionDetailInFaults = true, InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)]
public partial class ServiceBusiness : IContract
{
}
代理：Proxy
public partial class Proxy : ClientBase<IContract>, IContract, IDisposable
    {
        public Proxy()
            : base()
        {
        }
        public void EndSession(Guid sessionID)
        {
            base.Channel.EndSession(sessionID);
        }
    }
ASP.NET AJAX中的WebService
}
 using System.Web.Script.Services;
 [WebService(Namespace = "http://tempuri.org/")]
 [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService]
public class SayHelloService : System.Web.Services.WebService
{
    public SayHelloService() { }
    [WebMethod]
    public string SayHello()
   {
        Hello myHello = new Hello();
        return myHello.SayHello();
   }