asp.net 后台开线程写脚本提示异常“ 响应在此上下文中不可用”

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Hosting;
using System.Net.Sockets;
using System.Net;
using System.Text;
using System.IO;
using System.Threading;
namespace WebApplication1
{
public partial class login : System.Web.UI.Page
{
Socket clientsocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);//socket对象
int jiazai = 0;
protected void Page_Load(object sender, EventArgs e)
{

    }
    protected void btnlogin_Click(object sender, EventArgs e)
    {
        if (txtid.Text == "" || txtpwd.Text == "" || !message.isnumber(txtid.Text))
        {
            Response.Write("<script>alert('账户不能为空且只能由数字组成！')</script>");
        }
        else
        {
            if (jiazai == 0)
            {
                IPAddress ipconn = IPAddress.Parse("192.168.43.225");
                //IPAddress ip=IPAddress.Parse("192.9.101.211");
                clientsocket.Connect(ipconn, 8885);//socket客户端连接
                Thread td = new Thread(recive);//这里是接收线程
                td.IsBackground = true;
                td.Start(clientsocket);//线程开启
                jiazai += 1;//开启一次之后就不用再开启了
            }
            string ip=jiakongge(getipv4(),20);
            byte[] sen=new byte[1024];
            sen = Encoding.UTF8.GetBytes(ip + "01" + jiakongge(txtid.Text, 10) + jiakongge(txtpwd.Text, 20));//这里是客户信息
            clientsocket.Send(sen);
        }
    }
    private void recive(object obj)
    {
        Socket ss = (Socket)obj;
        while(true)
        {
            byte[] rec = new byte[1024];
            byte[] sen = new byte[1024];
            int len = ss.Receive(rec);//接收信息
            if (len > 0)
            {
                string taojiezi = Encoding.UTF8.GetString(rec);
                string answer = taojiezi.Substring(3, 1);
                switch (answer)
                {
                    case "0":
                        Response.Write("<script>alert('没有此用户！');</script>");//此处报错
                        break;
                    case "1":
                        Response.Write("<script>alert('密码错误！');</script>");
                        break;
                    case "2":
                        sen = Encoding.UTF8.GetBytes(jiakongge(getipv4(), 20) + "99");
                        ss.Send(sen);
                        Response.Redirect("main.aspx");
                        break;
                    case "3":
                        Response.Write("<script>alert('出现异常！');</script>");
                        break;
                }
            }
        }
    }
    private static string getipv4()//获取IPv4地址
    {
        string hostname = Dns.GetHostName();
        IPHostEntry ipentry = Dns.GetHostEntry(hostname);
        for (int i = 0; i < ipentry.AddressList.Length; i++)
        {
            if (ipentry.AddressList[i].AddressFamily == AddressFamily.InterNetwork)
            {
                return ipentry.AddressList[i].ToString();
            }
        }
        return "";
    }
    private static string jiakongge(string s,int len)//固定字符串长度，不够右补空格
    {
        int a;
        if (string.IsNullOrEmpty(s))
        {
            a = 0;
            return s;
        }
        else
        {
            a = s.Length;
            if (a < len)
            {
                for (int i = 0; i < (len - a); i++)
                {
                    s = s + " ";
                }
                return s;
            }
            else
            {
                return s.Substring(0,len);
            }
        }
    }
}

}

Answer 1

新起thread里面还要用原来的response？那你把response传给thread看看