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本文所述为基于C#实现的端口扫描器代码，代码内包括了窗体和逻辑处理两部分代码。在代码中，创建TcpClient对象，把TcpClient用于为TCP网络服务提供客户端连接，创建线程，并创建ThreadStart委托对象，端口扫描范围为[0-65536]，也可自定义扫描范围。
功能主要代码如下：
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
namespace PortScanner
{
public class Form1: System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox txtAddr;
private System.Windows.Forms.TextBox txtStart;
private System.Windows.Forms.TextBox txtEnd;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Splitter splitter1;
private System.Windows.Forms.ListBox lbResult;
private System.Windows.Forms.Button btnScan;
private System.Windows.Forms.ProgressBar progressBar1;
private System.Windows.Forms.Label lblStart;
private System.Windows.Forms.Label lblStop;
private System.Windows.Forms.Label lblNow;
//自定义变量
private int port;
private string Addr;
private bool[] done = new bool[65536];
private int start;
private int end;
private Thread scanThread;
private bool OK;
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.lbResult = new System.Windows.Forms.ListBox();
this.txtAddr = new System.Windows.Forms.TextBox();
this.txtStart = new System.Windows.Forms.TextBox();
this.txtEnd = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.label3 = new System.Windows.Forms.Label();
this.splitter1 = new System.Windows.Forms.Splitter();
this.btnScan = new System.Windows.Forms.Button();
this.progressBar1 = new System.Windows.Forms.ProgressBar();
this.lblStart = new System.Windows.Forms.Label();
this.lblStop = new System.Windows.Forms.Label();
this.lblNow = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// lbResult
//
this.lbResult.Dock = System.Windows.Forms.DockStyle.Right;
this.lbResult.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lbResult.ItemHeight = 14;
this.lbResult.Location = new System.Drawing.Point(224, 0);
this.lbResult.Name = "lbResult";
this.lbResult.Size = new System.Drawing.Size(264, 270);
this.lbResult.TabIndex = 0;
//
// txtAddr
//
this.txtAddr.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.txtAddr.Location = new System.Drawing.Point(72, 16);
this.txtAddr.Name = "txtAddr";
this.txtAddr.Size = new System.Drawing.Size(136, 22);
this.txtAddr.TabIndex = 1;
this.txtAddr.Text = "";
//
// txtStart
//
this.txtStart.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.txtStart.Location = new System.Drawing.Point(72, 48);
this.txtStart.Name = "txtStart";
this.txtStart.Size = new System.Drawing.Size(136, 22);
this.txtStart.TabIndex = 2;
this.txtStart.Text = "";
this.txtStart.TextChanged += new System.EventHandler(this.txtStart_TextChanged);
//
// txtEnd
//
this.txtEnd.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.txtEnd.Location = new System.Drawing.Point(72, 80);
this.txtEnd.Name = "txtEnd";
this.txtEnd.Size = new System.Drawing.Size(136, 22);
this.txtEnd.TabIndex = 3;
this.txtEnd.Text = "";
this.txtEnd.TextChanged += new System.EventHandler(this.txtEnd_TextChanged);
//
// label1
//
this.label1.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.label1.Location = new System.Drawing.Point(8, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(64, 23);
this.label1.TabIndex = 4;
this.label1.Text = "主机地址";
//
// label2
//
this.label2.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.label2.Location = new System.Drawing.Point(8, 80);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(64, 23);
this.label2.TabIndex = 5;
this.label2.Text = "结束端口";
//
// label3
//
this.label3.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.label3.Location = new System.Drawing.Point(8, 48);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(64, 23);
this.label3.TabIndex = 6;
this.label3.Text = "起始端口";
//
// splitter1
//
this.splitter1.Dock = System.Windows.Forms.DockStyle.Right;
this.splitter1.Location = new System.Drawing.Point(221, 0);
this.splitter1.Name = "splitter1";
this.splitter1.RightToLeft = System.Windows.Forms.RightToLeft.Yes;
this.splitter1.Size = new System.Drawing.Size(3, 273);
this.splitter1.TabIndex = 7;
this.splitter1.TabStop = false;
//
// btnScan
//
this.btnScan.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.btnScan.Location = new System.Drawing.Point(72, 200);
this.btnScan.Name = "btnScan";
this.btnScan.TabIndex = 8;
this.btnScan.Text = "扫描";
this.btnScan.Click += new System.EventHandler(this.btnScan_Click);
//
// progressBar1
//
this.progressBar1.Location = new System.Drawing.Point(8, 112);
this.progressBar1.Name = "progressBar1";
this.progressBar1.Size = new System.Drawing.Size(200, 23);
this.progressBar1.Step = 1;
this.progressBar1.TabIndex = 9;
//
// lblStart
//
this.lblStart.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblStart.Location = new System.Drawing.Point(8, 144);
this.lblStart.Name = "lblStart";
this.lblStart.Size = new System.Drawing.Size(48, 23);
this.lblStart.TabIndex = 10;
//
// lblStop
//
this.lblStop.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblStop.Location = new System.Drawing.Point(160, 144);
this.lblStop.Name = "lblStop";
this.lblStop.Size = new System.Drawing.Size(48, 23);
this.lblStop.TabIndex = 11;
//
// lblNow
//
this.lblNow.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
this.lblNow.Location = new System.Drawing.Point(84, 144);
this.lblNow.Name = "lblNow";
this.lblNow.Size = new System.Drawing.Size(48, 23);
this.lblNow.TabIndex = 12;
this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
this.ClientSize = new System.Drawing.Size(488, 273);
this.Controls.Add(this.lblNow);
this.Controls.Add(this.lblStop);
this.Controls.Add(this.lblStart);
this.Controls.Add(this.progressBar1);
this.Controls.Add(this.btnScan);
this.Controls.Add(this.splitter1);
this.Controls.Add(this.label3);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Controls.Add(this.txtEnd);
this.Controls.Add(this.txtStart);
this.Controls.Add(this.txtAddr);
this.Controls.Add(this.lbResult);
this.Font = new System.Drawing.Font("Tahoma", 9F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((