基于C#实现端口扫描器(单线程和多线程) 基于C#实现端口扫描器(单线程

一、新建项目并设置界面
二、单线程实现端口扫描

1. 编写代码
2. 运行结果

三、多线程实现端口扫描

1. 编写代码
2. 运行结果

四、总结

一、新建项目并设置界面新建项目：
选择Windows窗体项目应用(.Net Framework)：

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设置项目名和路径：

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新建项目如下：

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设置界面：

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将tbShow设置为只读:

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二、单线程实现端口扫描

1. 编写代码
双击按钮，编写其点击事件：

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Net.Sockets; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace Scan{public partial class Form1 : Form{//主机地址private string hostAddress; //起始端口private int start; //终止端口private int end; //端口号private int port; //定义线程对象private Thread scanThread; public Form1(){InitializeComponent(); }private void button1_Click_1(object sender, EventArgs e){try{//初始化tbShow.Clear(); lb.Text = "0%"; //获取ip地址和始末端口号hostAddress = tbHost.Text; start = Int32.Parse(tbSPort.Text); end = Int32.Parse(tbEPort.Text); if (decideAddress()) // 端口合理{//让输入的textbox只读，无法改变tbHost.ReadOnly = true; tbSPort.ReadOnly = true; tbEPort.ReadOnly = true; //设置进度条的范围pb.Minimum = start; pb.Maximum = end; //显示框显示tbShow.AppendText("端口扫描器 v1.0.0" + Environment.NewLine + Environment.NewLine); //调用端口扫描函数PortScan(); }else{//若端口号不合理，弹窗报错MessageBox.Show("输入错误，端口范围为[0-65536]!"); }}catch{//若输入的端口号为非整型，则弹窗报错MessageBox.Show("输入错误，端口范围为[0-65536]!"); }}/// /// 判断端口是否合理/// /// private bool decideAddress(){//判断端口号是否合理if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))return true; elsereturn false; }private void PortScan(){double x; string xian; //显示扫描状态tbShow.AppendText("开始扫描...（可能需要请您等待几分钟）" + Environment.NewLine + Environment.NewLine); //循环抛出线程扫描端口for (int i = start; i <= end; i++){x = (double)(i - start + 1) / (end - start + 1); xian = x.ToString("0%"); port = i; //调用端口i的扫描操作Scan(); //进度条值改变lb.Text = xian; lb.Refresh(); pb.Value = https://www.it610.com/article/i; }tbShow.AppendText(Environment.NewLine +"扫描结束！" + Environment.NewLine); //输入框textbox只读属性取消tbHost.ReadOnly = false; tbSPort.ReadOnly = false; tbEPort.ReadOnly = false; }/// /// 扫描某个端口/// private void Scan(){int portnow = port; //创建TcpClient对象，TcpClient用于为TCP网络服务提供客户端连接TcpClient objTCP = null; try{//用于TcpClient对象扫描端口objTCP = new TcpClient(hostAddress, portnow); //扫描到则显示到显示框tbShow.AppendText("端口 " + port + " 开放！" + Environment.NewLine); }catch{//未扫描到，则会抛出错误}}}}

2. 运行结果

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【基于C#实现端口扫描器(单线程和多线程)】可发现速度十分缓慢，且不能拖拽。

三、多线程实现端口扫描 1. 编写代码

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Net.Sockets; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace Scan{public partial class Form1 : Form{//主机地址private string hostAddress; //起始端口private int start; //终止端口private int end; //端口号private int port; //定义线程对象private Thread scanThread; //定义端口状态数据（开放则为true，否则为false）private bool[] done = new bool[65526]; private bool OK; public Form1(){InitializeComponent(); //不进行跨线程检查CheckForIllegalCrossThreadCalls = false; }private void button1_Click_1(object sender, EventArgs e){try{//初始化tbShow.Clear(); lb.Text = "0%"; //获取ip地址和始末端口号hostAddress = tbHost.Text; start = Int32.Parse(tbSPort.Text); end = Int32.Parse(tbEPort.Text); if (decideAddress()) // 端口合理{//让输入的textbox只读，无法改变tbHost.ReadOnly = true; tbSPort.ReadOnly = true; tbEPort.ReadOnly = true; //创建线程，并创建ThreadStart委托对象Thread process = new Thread(new ThreadStart(PortScan)); process.Start(); //设置进度条的范围pb.Minimum = start; pb.Maximum = end; //显示框显示tbShow.AppendText("端口扫描器 v1.0.0" + Environment.NewLine + Environment.NewLine); }else{//若端口号不合理，弹窗报错MessageBox.Show("输入错误，端口范围为[0-65536]!"); }}catch{//若输入的端口号为非整型，则弹窗报错MessageBox.Show("输入错误，端口范围为[0-65536]!"); }}/// /// 判断端口是否合理/// /// private bool decideAddress(){//判断端口号是否合理if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))return true; elsereturn false; }private void PortScan(){double x; string xian; //显示扫描状态tbShow.AppendText("开始扫描...（可能需要请您等待几分钟）" + Environment.NewLine + Environment.NewLine); //循环抛出线程扫描端口for (int i = start; i <= end; i++){x = (double)(i - start + 1) / (end - start + 1); xian = x.ToString("0%"); port = i; //使用该端口的扫描线程scanThread = new Thread(new ThreadStart(Scan)); scanThread.Start(); //使线程睡眠System.Threading.Thread.Sleep(100); //进度条值改变lb.Text = xian; pb.Value = https://www.it610.com/article/i; }while (!OK){OK = true; for (int i = start; i <= end; i++){if (!done[i]){OK = false; break; }}System.Threading.Thread.Sleep(1000); }tbShow.AppendText(Environment.NewLine +"扫描结束！" + Environment.NewLine); //输入框textbox只读属性取消tbHost.ReadOnly = false; tbSPort.ReadOnly = false; tbEPort.ReadOnly = false; }/// /// 扫描某个端口/// private void Scan(){int portnow = port; //创建线程变量Thread Threadnow = scanThread; //扫描端口，成功则写入信息done[portnow] = true; //创建TcpClient对象，TcpClient用于为TCP网络服务提供客户端连接TcpClient objTCP = null; try{//用于TcpClient对象扫描端口objTCP = new TcpClient(hostAddress, portnow); //扫描到则显示到显示框tbShow.AppendText("端口 " + port + " 开放！" + Environment.NewLine); }catch{//未扫描到，则会抛出错误}}}}

2. 运行结果

可发现速度明显变快，且能拖拽窗口。

四、总结多线程可以提高CPU的利用率。
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