c#端口扫描器源代码

老师要求写的一个端口扫描器

图:

 

源代码:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace scanports
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox txtip;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.TextBox txtmin;
        private System.Windows.Forms.TextBox txtmax;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.ListBox lisstatus;
        private System.Windows.Forms.Button btnexit;
        private System.Windows.Forms.Button btnscan;
        private System.Windows.Forms.Button btnpause;
        private System.Windows.Forms.Button btncontinnue;
        //定义一个线程
        private Thread t;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows 窗体设计器生成的代码

        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void btnscan_Click(object sender, System.EventArgs e)
        {
            //清空列表
            lisstatus.Items.Clear();
            //相应的按钮的显示与关闭
            btnpause.Enabled=true;
            btnscan.Enabled=false;
            this.txtip.Enabled=false;
            this.txtmax.Enabled=false;
            this.txtmin.Enabled=false;
            //调用线程
             t=new Thread(new ThreadStart(scanport));
            t.Start();
        }
        void scanport()
        {
            try
            {
                TcpClient client=new TcpClient();
                IPAddress address=IPAddress.Parse(txtip.Text);
                for(int i=int.Parse(txtmin.Text);i<=int.Parse(txtmax.Text);i++)
                {
                    try
                    {
                        //扫描制定的端口范围
                        client.Connect(address,i);
                        lisstatus.Items.Add("端口"+i+"是打开的");
                    }
                    catch(SocketException)
                    {
                        lisstatus.Items.Add("端口"+i+"是关闭的");
                    }
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                //设置按钮的状态
                btnscan.Enabled=true;
                this.txtip.Enabled=true;
                this.txtmax.Enabled=true;
                this.txtmin.Enabled=true;

            }
            
        }

        private void btnexit_Click(object sender, System.EventArgs e)
        {
            //关闭线程,并退出
            t.Abort();
            this.Close();
        }

        private void btnpause_Click(object sender, System.EventArgs e)
        {
            //暂停线程
            btnpause.Enabled=false;
            t.Suspend();
            btncontinnue.Enabled=true;
        }

        private void btncontinnue_Click(object sender, System.EventArgs e)
        {
            //继续线程
            btncontinnue.Enabled=false;
            t.Resume();
            btnpause.Enabled=true;
        }
    }
}