由于asp2.0提供了异步页的支持使异步调用WebService的性能有了真正的提升。使用异步页，首先要设置Async="true"，异步页是在Prerender和PrerenderComplete事件间加入Begin，end异步方法实现的，Begin和End方法属于不同的线程。WS异步页的实现有两种方式：1、使用等待方法实现异步通用类，封装了WS/**//// <summary>        /// 使用等待方法实现异步        /// </summary>        /// <param name="name"></param>        /// <returns></returns>        private Account account;        private string username;        public Account Account        {            get { return account; }            set { account = value; }        }        public string Username        {            get { return username; }            set { username = value; }        }        public IAsyncResult BeginAsyncGetAccount(object sender, EventArgs e, AsyncCallback cb, object state)        {                       return vb.BeginGetAccountbyName(username,cb,state);        }        public void EndAsyncGetAccount(IAsyncResult ar)        {            account = vb.EndGetAccountbyName(ar);        }           /**//// <summary>        /// 使用事件驱动的异步        /// </summary>        /// <param name="username"></param>        public void GetAccountCompleted(Object source, VB.GetAccountbyNameCompletedEventArgs e)        {            account = e.Result;        }        public void AsGetAccount(string username)        {                      vb.GetAccountbyNameCompleted += new GetAccountbyNameCompletedEventHandler(GetAccountCompleted);            vb.GetAccountbyNameAsync(username）                    }调用方法 protected void Page_Load(object sender, EventArgs e)    {        this.PreRenderComplete += new EventHandler(Page_PreRenderComplete);        b.Username = "dinghao";               AddOnPreRenderCompleteAsync(b.BeginAsyncGetAccount, b.EndAsyncGetAccount);    }    protected void Page_PreRenderComplete(object sender, EventArgs e)    {        //异步调用结束        VB.Account a = b.Account;        AccountIf ai = new AccountIf(a);        ais[0] = ai;        GridView1.DataSource = ais;        GridView1.DataBind();    }由于AddOnPreRenderCompleteAsync的两个委托都是Void类型，所以在通用类中要加入有返回值的属性如：Account供主调方法使用，另外委托中没有异步方法的参数信息，要加入参数的属性如：Username2、事件驱动的异步（2.0新增）调用方法：protected void Page_Load(object sender, EventArgs e)    {        this.PreRenderComplete += new EventHandler(Page_PreRenderComplete);        b.AsGetAccount("dinghao");         }    protected void Page_PreRenderComplete(object sender, EventArgs e)    {        //异步调用结束        VB.Account a = b.Account;        AccountIf ai = new AccountIf(a);        ais[0] = ai;        GridView1.DataSource = ais;        GridView1.DataBind();    }这种调用方式，用的是*Completed事件，在*Async完成时触发，这种调用方式可以省去Account，Username属性，用起来比较简单

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