异步方法

 

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

using Common;

namespace web
{
    // 异步发送邮件委托
    public delegate void DelegateMail();

    /// <summary>
    /// 异步类
    /// </summary>
    public class Async
    {
        #region 异步发送邮件

        public static void SendMail(CMail mail)
        {
            // 实例化委托并初赋值
            DelegateMail dm = new DelegateMail(mail.Send);
            // 实例化回调方法
            // 把AsyncCallback看成Delegate你就懂了，实际上AsyncCallback是一种特殊的Delegate，就像Event似的
            AsyncCallback acb = new AsyncCallback(MailCallBack);
            dm.BeginInvoke(acb, dm);
        }

        public static void MailCallBack(IAsyncResult result)
        {
            // 从异步状态ar.AsyncState中，获取委托对象
            DelegateMail dm = (DelegateMail)result.AsyncState;
            // 一定要EndInvoke
            dm.EndInvoke(result);
        }

        #endregion
    }

    

}