C# WinForm 检查目标IP端口是否可连接

namespace IPPort_CheckTool
{
    partial class MainForm
    {
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (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 - 不要修改
        /// 使用代码编辑器修改此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.txt_Time = new System.Windows.Forms.Label();
            this.txt_CoreNum = new System.Windows.Forms.Label();
            this.txt_Active = new System.Windows.Forms.Label();
            this.txt_NoActive = new System.Windows.Forms.Label();
            this.btn_Start = new System.Windows.Forms.Button();
            this.label3 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label1 = new System.Windows.Forms.Label();
            this.txt_PortEnd = new System.Windows.Forms.TextBox();
            this.txt_PortStart = new System.Windows.Forms.TextBox();
            this.txt_IP = new System.Windows.Forms.TextBox();
            this.listBox_NoActive = new System.Windows.Forms.ListBox();
            this.listBox_ActivePort = new System.Windows.Forms.ListBox();
            this.progressBar = new System.Windows.Forms.ProgressBar();
            this.groupBox1.SuspendLayout();
            this.SuspendLayout();
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.progressBar);
            this.groupBox1.Controls.Add(this.txt_Time);
            this.groupBox1.Controls.Add(this.txt_CoreNum);
            this.groupBox1.Controls.Add(this.txt_Active);
            this.groupBox1.Controls.Add(this.txt_NoActive);
            this.groupBox1.Controls.Add(this.btn_Start);
            this.groupBox1.Controls.Add(this.label3);
            this.groupBox1.Controls.Add(this.label2);
            this.groupBox1.Controls.Add(this.label1);
            this.groupBox1.Controls.Add(this.txt_PortEnd);
            this.groupBox1.Controls.Add(this.txt_PortStart);
            this.groupBox1.Controls.Add(this.txt_IP);
            this.groupBox1.Dock = System.Windows.Forms.DockStyle.Top;
            this.groupBox1.Location = new System.Drawing.Point(3, 3);
            this.groupBox1.Margin = new System.Windows.Forms.Padding(5);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Padding = new System.Windows.Forms.Padding(5);
            this.groupBox1.Size = new System.Drawing.Size(1058, 127);
            this.groupBox1.TabIndex = 0;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "配置：";
            // 
            // txt_Time
            // 
            this.txt_Time.AutoSize = true;
            this.txt_Time.ForeColor = System.Drawing.Color.Green;
            this.txt_Time.Location = new System.Drawing.Point(844, 101);
            this.txt_Time.Name = "txt_Time";
            this.txt_Time.Size = new System.Drawing.Size(74, 21);
            this.txt_Time.TabIndex = 10;
            this.txt_Time.Text = "耗时：0s";
            // 
            // txt_CoreNum
            // 
            this.txt_CoreNum.AutoSize = true;
            this.txt_CoreNum.ForeColor = System.Drawing.Color.Green;
            this.txt_CoreNum.Location = new System.Drawing.Point(610, 101);
            this.txt_CoreNum.Name = "txt_CoreNum";
            this.txt_CoreNum.Size = new System.Drawing.Size(120, 21);
            this.txt_CoreNum.TabIndex = 9;
            this.txt_CoreNum.Text = "CPU核心总数:0";
            // 
            // txt_Active
            // 
            this.txt_Active.AutoSize = true;
            this.txt_Active.ForeColor = System.Drawing.Color.Green;
            this.txt_Active.Location = new System.Drawing.Point(389, 101);
            this.txt_Active.Name = "txt_Active";
            this.txt_Active.Size = new System.Drawing.Size(119, 21);
            this.txt_Active.TabIndex = 8;
            this.txt_Active.Text = "激活端口总数:0";
            // 
            // txt_NoActive
            // 
            this.txt_NoActive.AutoSize = true;
            this.txt_NoActive.Location = new System.Drawing.Point(3, 101);
            this.txt_NoActive.Name = "txt_NoActive";
            this.txt_NoActive.Size = new System.Drawing.Size(135, 21);
            this.txt_NoActive.TabIndex = 7;
            this.txt_NoActive.Text = "未激活端口总数:0";
            // 
            // btn_Start
            // 
            this.btn_Start.Location = new System.Drawing.Point(915, 30);
            this.btn_Start.Name = "btn_Start";
            this.btn_Start.Size = new System.Drawing.Size(123, 56);
            this.btn_Start.TabIndex = 6;
            this.btn_Start.Text = "开始测试端口是否激活";
            this.btn_Start.UseVisualStyleBackColor = true;
            this.btn_Start.Click += new System.EventHandler(this.btn_Start_Click);
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(530, 41);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(78, 21);
            this.label3.TabIndex = 5;
            this.label3.Text = "结束端口:";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(252, 41);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(78, 21);
            this.label2.TabIndex = 4;
            this.label2.Text = "开始端口:";
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(23, 41);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(29, 21);
            this.label1.TabIndex = 3;
            this.label1.Text = "IP:";
            // 
            // txt_PortEnd
            // 
            this.txt_PortEnd.Location = new System.Drawing.Point(633, 41);
            this.txt_PortEnd.Name = "txt_PortEnd";
            this.txt_PortEnd.Size = new System.Drawing.Size(150, 29);
            this.txt_PortEnd.TabIndex = 2;
            // 
            // txt_PortStart
            // 
            this.txt_PortStart.Location = new System.Drawing.Point(355, 41);
            this.txt_PortStart.Name = "txt_PortStart";
            this.txt_PortStart.Size = new System.Drawing.Size(150, 29);
            this.txt_PortStart.TabIndex = 1;
            // 
            // txt_IP
            // 
            this.txt_IP.Location = new System.Drawing.Point(77, 41);
            this.txt_IP.Name = "txt_IP";
            this.txt_IP.Size = new System.Drawing.Size(150, 29);
            this.txt_IP.TabIndex = 0;
            // 
            // listBox_NoActive
            // 
            this.listBox_NoActive.Dock = System.Windows.Forms.DockStyle.Left;
            this.listBox_NoActive.ForeColor = System.Drawing.Color.Gray;
            this.listBox_NoActive.FormattingEnabled = true;
            this.listBox_NoActive.ItemHeight = 21;
            this.listBox_NoActive.Location = new System.Drawing.Point(3, 130);
            this.listBox_NoActive.Name = "listBox_NoActive";
            this.listBox_NoActive.Size = new System.Drawing.Size(383, 548);
            this.listBox_NoActive.TabIndex = 1;
            // 
            // listBox_ActivePort
            // 
            this.listBox_ActivePort.Dock = System.Windows.Forms.DockStyle.Fill;
            this.listBox_ActivePort.ForeColor = System.Drawing.Color.Green;
            this.listBox_ActivePort.FormattingEnabled = true;
            this.listBox_ActivePort.ItemHeight = 21;
            this.listBox_ActivePort.Location = new System.Drawing.Point(386, 130);
            this.listBox_ActivePort.Name = "listBox_ActivePort";
            this.listBox_ActivePort.Size = new System.Drawing.Size(675, 548);
            this.listBox_ActivePort.TabIndex = 2;
            // 
            // progressBar
            // 
            this.progressBar.Location = new System.Drawing.Point(798, 41);
            this.progressBar.Name = "progressBar";
            this.progressBar.Size = new System.Drawing.Size(100, 29);
            this.progressBar.TabIndex = 11;
            // 
            // MainForm
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(10F, 21F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(1064, 681);
            this.Controls.Add(this.listBox_ActivePort);
            this.Controls.Add(this.listBox_NoActive);
            this.Controls.Add(this.groupBox1);
            this.Font = new System.Drawing.Font("微软雅黑", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            this.Margin = new System.Windows.Forms.Padding(5);
            this.Name = "MainForm";
            this.Padding = new System.Windows.Forms.Padding(3);
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "Hello!";
            this.groupBox1.ResumeLayout(false);
            this.groupBox1.PerformLayout();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.TextBox txt_PortEnd;
        private System.Windows.Forms.TextBox txt_PortStart;
        private System.Windows.Forms.TextBox txt_IP;
        private System.Windows.Forms.Label label2;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.Button btn_Start;
        private System.Windows.Forms.ListBox listBox_NoActive;
        private System.Windows.Forms.ListBox listBox_ActivePort;
        private System.Windows.Forms.Label txt_NoActive;
        private System.Windows.Forms.Label txt_Active;
        private System.Windows.Forms.Label txt_CoreNum;
        private System.Windows.Forms.Label txt_Time;
        private System.Windows.Forms.ProgressBar progressBar;
    }
}

using System;
using System.Configuration;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace IPPort_CheckTool
{
    public partial class MainForm : Form
    {
        private Configuration config = ConfigurationManager.OpenExeConfiguration(Application.ExecutablePath);
        private DateTime startTime;
        private Task[] tasks;

        private NotifyIcon notifyIcon;

        public MainForm()
        {
            InitializeComponent();

            var now = DateTime.Now;
            this.Text = $"Hello 今天是{now.ToString("dddd")}哟 🤭";

            this.txt_IP.Text = ConfigurationManager.AppSettings["IP"].ToString();
            this.txt_PortStart.Text = ConfigurationManager.AppSettings["MinPortStart"].ToString();
            this.txt_PortEnd.Text = ConfigurationManager.AppSettings["MaxPortEnd"].ToString();
            this.txt_CoreNum.Text = $"CPU核心总数：{Environment.ProcessorCount}";

            this.components = new System.ComponentModel.Container();
            this.notifyIcon = new NotifyIcon(this.components);
            this.notifyIcon.Visible = true;
            this.notifyIcon.MouseClick += (sn, en) => { if (en.Button == MouseButtons.Left) this.Show(); };
            var menus = new ContextMenu();
            var menu1= new MenuItem("退出软件");
            menu1.Click += (s1, e1) => { this.Close(); };
            menus.MenuItems.Add(menu1);
            notifyIcon.ContextMenu= menus;
        }

        private void btn_Start_Click(object sender, EventArgs e)
        {
            string ip = this.txt_IP.Text.Trim();
            string min = this.txt_PortStart.Text.Trim();
            string max = this.txt_PortEnd.Text.Trim();

            if (string.IsNullOrWhiteSpace(ip) || string.IsNullOrWhiteSpace(min) || string.IsNullOrWhiteSpace(max))
            {
                MessageBox.Show("不能为空！");
                return;
            }

            if (!int.TryParse(min, out var minPort) || !int.TryParse(max, out var maxPort))
            {
                MessageBox.Show("端口不是整数！");
                return;
            }

            config.AppSettings.Settings["IP"].Value = ip;
            config.AppSettings.Settings["MinPortStart"].Value = min;
            config.AppSettings.Settings["MaxPortEnd"].Value = max;
            config.Save();
            ConfigurationManager.RefreshSection("appSettings");

            IPAddress targetIpAddress = IPAddress.Parse(ip);
            var ipadrlist = Dns.GetHostAddresses(Dns.GetHostName()).ToList();
            ipadrlist.Add(IPAddress.Parse("127.0.0.1"));
            ipadrlist.Add(IPAddress.Parse("0.0.0.0"));
            if (ipadrlist.Contains(targetIpAddress))
            {
                CheckLocalPort(minPort, maxPort);//本地IP
            }
            else
            {
                CheckRemotePort(ip, minPort, maxPort);//远程IP
            }
        }

        private void CheckLocalPort(int minPort, int maxPort)
        {
            btn_Start.Enabled = false;

            listBox_NoActive.Items.Clear();
            listBox_ActivePort.Items.Clear();
            startTime = DateTime.Now;
            int length = maxPort - minPort + 1;
            progressBar.Maximum = length;
            progressBar.Minimum = 0;

            var ips = IPGlobalProperties.GetIPGlobalProperties();
            var activeIps = ips.GetActiveTcpListeners().Select(p => p.Port).ToHashSet();

            Task.Factory.StartNew(new Action(() =>
            {
                for (int i = minPort; i <= maxPort; i++)
                {
                    int port = i;
                    this?.Invoke(new Action(() =>
                    {
                        if (activeIps.Contains(port))
                        {
                            listBox_ActivePort.Items.Insert(0, port);
                            txt_Active.Text = $"激活端口总数：{listBox_ActivePort.Items.Count}";
                        }
                        else
                        {
                            listBox_NoActive.Items.Insert(0, port);
                            txt_NoActive.Text = $"未激活端口总数：{listBox_NoActive.Items.Count}";
                        }
                        progressBar.Value = listBox_ActivePort.Items.Count + listBox_NoActive.Items.Count;
                        txt_Time.Text = $"耗时：{(DateTime.Now - startTime).TotalSeconds.ToString()}s";

                        //耗时操作卡死UI 处理方法
                        Application.DoEvents();
                    }));
                }

            })).ContinueWith(p => InitUI());

        }

        private void CheckRemotePort(string ip, int minPort, int maxPort)
        {
            btn_Start.Enabled = false;

            listBox_NoActive.Items.Clear();
            listBox_ActivePort.Items.Clear();
            startTime = DateTime.Now;
            int length = maxPort - minPort + 1;
            tasks = new Task[length];
            progressBar.Maximum = length;
            progressBar.Minimum = 0;

            Task.Run(() =>
            {
                for (int i = minPort; i <= maxPort; i++)
                {
                    int port = i;
                    var task = Task.Factory.StartNew(new Action(() =>
                    {
                        var res = CheckRemotePortCanConnect(ip, port);
                        this?.Invoke(new Action(() =>
                        {
                            if (res.Item1)
                            {
                                listBox_ActivePort.Items.Insert(0, res.Item2);
                                txt_Active.Text = $"激活端口总数：{listBox_ActivePort.Items.Count}";
                            }
                            else
                            {
                                listBox_NoActive.Items.Insert(0, res.Item2);
                                txt_NoActive.Text = $"未激活端口总数：{listBox_NoActive.Items.Count}";
                            }
                            progressBar.Value = listBox_ActivePort.Items.Count + listBox_NoActive.Items.Count;
                            txt_Time.Text = $"耗时：{(DateTime.Now - startTime).TotalSeconds.ToString()}s";

                            //耗时操作卡死UI 处理方法
                            Application.DoEvents();
                        }));
                    }));
                    tasks[i - minPort] = task;
                }

                Task.WaitAll(tasks);

            }).ContinueWith(p => InitUI());
        }

        private void InitUI()
        {
            this?.Invoke(new Action(() => { btn_Start.Enabled = true; }));
        }

        private (bool,int) CheckRemotePortCanConnect(string ipString, int port)
        {
            IPAddress ip = IPAddress.Parse(ipString);

            bool isConnect = false;

            TcpClient tcp = new TcpClient();
            try
            {
                tcp.Connect(ip, port);
                isConnect = tcp.Connected;
            }
            catch (Exception)
            {
                isConnect = false;
            }
            finally
            {
                tcp?.Close();
                tcp?.Dispose();
            }
            return (isConnect, port);
        }
    }
}