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:Username
2、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
http://bluewater.cnblogs.com/archive/2006/06/20/430758.html
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