C#中ISpostback

响应客户端控件时ispostback为true

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class DateShow : System.Web.UI.Page
{
    string date;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (date == null)
        {
            date = DateTime.Now.ToString();
        }
        Response.Write("当前时间："+ date);
        if (!IsPostBack)
        {
            Response.Write("第一次加载！");
        }
        else
        {
            Response.Write("响应客户端请求加载");
        }
    }
}

　　刷新结果为第一次加载

点击button结果为响应客户端请求加载。