多线程 出现线程间无法提示

Question

网上 说法是用 委托 可是这个已经用了委托 还是不行 希望大侠帮个忙 告诉个解决办法后台代码  前台就是一个LISTBOX  主要是一个PING类 用于接受线程里面的IPusing System;
using System.Management;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Windows.Forms;
using System.Net.NetworkInformation;
using System.Net;
using System.Threading;namespace WindowsApplication2
{    public delegate void UpdataList(string sip, string shostname);    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public void UpDataMyList(string sip, string shostname)
        {            lock (this.listView1)
            {
                if (shostname != "no")
                {                    
                        
                        listBox1.Items.Add("扫描" + sip + shostname);
                   
                }
                else
                {
                    listBox1.Items.Add(sip + "不存在");
                }
            }
        
        }        private void button1_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
           
            int min = 1;
            int max = 10;
            string mask = "192.168.0.";
            int threadNum = max - min + 1;
            Thread[] myThread = new Thread[threadNum];
            for (int i = min; i <= max; i++)
            {
                int k = max - i;
                Ping myping = new Ping();
                myping.ip=mask+i.ToString();
                myping.ul = new UpdataList(UpDataMyList);
                myThread[k] = new Thread(new ThreadStart(myping.sacn));
                myThread[k].Start();            }
            
        }    }    public class Ping
    {
        public UpdataList ul;        public string ip;
        public string shostname;        public void sacn()
        {
            IPAddress myip = IPAddress.Parse(ip);
            try
            {
                IPHostEntry myhost = Dns.GetHostByAddress(myip);
                shostname = myhost.HostName.ToString();
            }
            catch
            {
                shostname = "";
            }            if (shostname == "")
                shostname = "no";
            if (ul != null)
                ul(ip, shostname);
        }    }
}

Answer 1

ul 你定义的UpdataList这个委托变量没有实例化啊 一直是空 你在if(ul == null) ul = UpDataMyList; 再 ul(ip, shostname); 

Answer 2

创建线程的时候 已经实例化了啊 
myping.ul = new UpdataList(UpDataMyList);  作为一个变量了

Answer 3

多线程间操作控件
public void UpDataMyList(string sip, string shostname)
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new UpdataList(UpDataMyList), new object[] { sip, shostname });
            }
            else
            {                lock (this.listView1)
                {
                    if (shostname != "no")
                    {
                        listBox1.Items.Add("扫描" + sip + shostname);                    }
                    else
                    {
                        listBox1.Items.Add(sip + "不存在");
                    }
                }
            }        }

Answer 4

谢谢   非常感谢 baihe_591