C# 根据ip扫描端口

【核心代码】

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

namespace PortCheck
{
	/// <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 textBox1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.NumericUpDown numericUpDown1;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.NumericUpDown numericUpDown2;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.RichTextBox richTextBox1;
		private System.Windows.Forms.ProgressBar progressBar1;
		/// <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 );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.textBox1 = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			this.numericUpDown1 = new System.Windows.Forms.NumericUpDown();
			this.label3 = new System.Windows.Forms.Label();
			this.numericUpDown2 = new System.Windows.Forms.NumericUpDown();
			this.button1 = new System.Windows.Forms.Button();
			this.richTextBox1 = new System.Windows.Forms.RichTextBox();
			this.progressBar1 = new System.Windows.Forms.ProgressBar();
			((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.numericUpDown2)).BeginInit();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 16);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(80, 16);
			this.label1.TabIndex = 0;
			this.label1.Text = "目标主机名：";
			// 
			// textBox1
			// 
			this.textBox1.Location = new System.Drawing.Point(88, 8);
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new System.Drawing.Size(72, 21);
			this.textBox1.TabIndex = 1;
			this.textBox1.Text = "127.0.0.1";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(168, 16);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(80, 16);
			this.label2.TabIndex = 2;
			this.label2.Text = "起始端口号：";
			// 
			// numericUpDown1
			// 
			this.numericUpDown1.Location = new System.Drawing.Point(248, 8);
			this.numericUpDown1.Maximum = new System.Decimal(new int[] {
																		   65536,
																		   0,
																		   0,
																		   0});
			this.numericUpDown1.Name = "numericUpDown1";
			this.numericUpDown1.Size = new System.Drawing.Size(80, 21);
			this.numericUpDown1.TabIndex = 3;
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(8, 40);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(80, 16);
			this.label3.TabIndex = 4;
			this.label3.Text = "结束端口号：";
			// 
			// numericUpDown2
			// 
			this.numericUpDown2.Location = new System.Drawing.Point(88, 32);
			this.numericUpDown2.Maximum = new System.Decimal(new int[] {
																		   65536,
																		   0,
																		   0,
																		   0});
			this.numericUpDown2.Name = "numericUpDown2";
			this.numericUpDown2.Size = new System.Drawing.Size(72, 21);
			this.numericUpDown2.TabIndex = 5;
			this.numericUpDown2.Value = new System.Decimal(new int[] {
																		 50,
																		 0,
																		 0,
																		 0});
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(248, 32);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(80, 23);
			this.button1.TabIndex = 6;
			this.button1.Text = "开始扫描";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// richTextBox1
			// 
			this.richTextBox1.Location = new System.Drawing.Point(8, 56);
			this.richTextBox1.Name = "richTextBox1";
			this.richTextBox1.Size = new System.Drawing.Size(320, 168);
			this.richTextBox1.TabIndex = 7;
			this.richTextBox1.Text = "";
			// 
			// progressBar1
			// 
			this.progressBar1.Location = new System.Drawing.Point(8, 224);
			this.progressBar1.Name = "progressBar1";
			this.progressBar1.Size = new System.Drawing.Size(320, 23);
			this.progressBar1.Step = 1;
			this.progressBar1.TabIndex = 10;
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(336, 254);
			this.Controls.Add(this.progressBar1);
			this.Controls.Add(this.richTextBox1);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.numericUpDown2);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.numericUpDown1);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.textBox1);
			this.Controls.Add(this.label1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示端口扫描";
			((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.numericUpDown2)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

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

		private void button1_Click(object sender, System.EventArgs e)
		{//扫描端口
			int iStart=(int)this.numericUpDown1.Value;
			int iEnd=(int)this.numericUpDown2.Value;
			try
			{
				this.progressBar1.Minimum=iStart;
				this.progressBar1.Maximum=iEnd;
				this.richTextBox1.Text="程序开始扫描端口：\n";	
				this.richTextBox1.Update();
				for(int i=iStart ;i<iEnd;i  )
				{
					this.progressBar1.Value=i;
					TcpClient MyTCP=null;						
					try
					{
						MyTCP = new TcpClient(this.textBox1.Text,i);
						this.richTextBox1.Text ="端口 "   i.ToString()   " 开放!\n";
						this.richTextBox1.Update();
					}			
					catch
					{
					}			
				}
				this.richTextBox1.Text ="扫描端口结束！\n";			
			}
			catch(Exception Err)
			{
				MessageBox.Show("扫描端口操作发生错误，错误信息是：" Err.Message,"信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}
	}
}