多任务网段扫描练习（扩展）

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace CXHA._2
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public static volatile float max = -1;
        public static volatile float min = -1;
        private static int flag = 0;

        public MainWindow()
        {
            InitializeComponent();
            label3.Visibility = Visibility.Hidden;
            textBox.Text = "192.168.";
            textBox1.Text = "1";
            textBox2.Text = "3";
            tb1.Text = "102";
            tb2.Text = "105";
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            string s1 = textBox.Text.ToString();
            int start1 = int.Parse(textBox1.Text);
            int end1 = int.Parse(textBox2.Text);
            int start2 = int.Parse(tb1.Text);
            int end2 = int.Parse(tb2.Text);
            //起始值和终止值的差
            int a1 = end1 - start1;
            int a2 = end2 - start2;
            //所有的地址个数
            int length = (a1 + 1) * (a2 + 1);
            if (a1<0 || a2<0 ) {
                MessageBox.Show("起始值不能大于终止值,输入错误请更正！");
                return;
            }
            listBox.Items.Clear();
            for (int i = start1; i <= end1; i++) {//倒数第二个
                for (int j = start2; j <= end2; j++)//倒数第一个
                {
                    IPAddress ip;
                    if (textBox.Text.EndsWith(".") == false)
                    {
                         ip = IPAddress.Parse(textBox.Text +"."+ i + "." + j);
                    }
                    else
                    {
                        ip= IPAddress.Parse(textBox.Text + i + "." + j);
                    }
                      
                    Thread t = new Thread(scan);
                 
                        t.Start((object)ip);
                }
      
            }
           Thread t1 = new Thread(show);          
            t1.Start((object)(length));
           // show((object)(length));
        }
        public void scan(object ip)
        {
            Stopwatch w = Stopwatch.StartNew();
            string host = "";
            try
            {
                host = Dns.GetHostEntry((IPAddress)ip).HostName;
            }
            catch
            {
                host = "不在线";
            }
            w.Stop();
                listBox.Dispatcher.Invoke(
                    () => listBox.Items.Add("扫描地址：" + ip + ",扫描用时：" + w.ElapsedMilliseconds + "毫秒，主机DNS名称：" + host)
                    );
                if (flag == 0)
                {
                    min = w.ElapsedMilliseconds;
                    max = w.ElapsedMilliseconds;
                }
                else
                {
                    if (w.ElapsedMilliseconds >= max)
                    {
                        max = w.ElapsedMilliseconds;
                    }
                    if (w.ElapsedMilliseconds <= min)
                    {

                        min = w.ElapsedMilliseconds;
                    }

                }
                flag++;
        }

        public void show(object a)
        {

            while (true)
            {

                if (flag == int.Parse(a.ToString()))
                {
                    label4.Dispatcher.Invoke(
                 () => label4.Content = "最大时间是:" + max
                    );
                    label5.Dispatcher.Invoke(
                () => label5.Content = "最小时间是:" + min
                   );
                    MessageBox.Show("线程全部运行结束！");
                    flag = 0;
                    break;
                }
            }
        }

        private void textBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            string s1;
            if (textBox.Text != "" && textBox1.Text != "" && textBox2.Text != "" && tb1.Text != "" && tb2.Text != "")
            {
                if (textBox.Text != "" && textBox.Text.EndsWith(".") == false)
                {
                    s1 = textBox.Text + "."+textBox1.Text + tb1.Text;
                   
                }
                else {
                    s1 = textBox.Text + textBox1.Text + tb1.Text;
                }
                string s2 = textBox.Text + textBox1.Text + tb2.Text;
                IPAddress p1, p2;
                if (IPAddress.TryParse(s1, out p1) == false || IPAddress.TryParse(s2, out p2) == false)
                {
                    label3.Visibility = Visibility.Visible;
                    button.IsEnabled = false;
                    return;
                }
                else
                {
                    label3.Visibility = Visibility.Hidden;
                    button.IsEnabled = true;
                }
            }else
            {
                button.IsEnabled = false;
            }
        }
    }
 
}