context.Response.Flush();

按道理该一行行显示啊，为啥我的还是等会然后全部刷新出来

 <%@ WebHandler Language="C#" Class="Responseflush" %>

using System;
using System.Web;

public class Responseflush : IHttpHandler {

    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/html";
                    for(int i = 0; i < 20; i++)
            {
                System.Threading.Thread.Sleep(500);
                context.Response.Write("第" + i + "步执行完成！</br>");
                context.Response.Flush();
            }
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}

应该是ie的问题。。chrome，Firefox测试没有问题

Sleep(500)是不是短点了，设置大点看看效果