C#一键显示及杀死占用端口号进程

参照园友freeliver54代码而做的，再根据需求做的，菜鸟一只有问题尽管提出来
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        private void t_btn_kill_Click(object sender, EventArgs e)
        {
            int port;
            bool b = int.TryParse(t_txt_guardport.Text, out port);
            if (!b)
            {
                MessageBox.Show("请输入正确的监听端口");
                return;
            }
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.CreateNoWindow = true;
            List<int> list_pid = GetPidByPort(p, port);
            if (list_pid.Count == 0)
            {
                MessageBox.Show("操作完成");
                return;
            }
            List<string> list_process = GetProcessNameByPid(p, list_pid);
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("占用" + port + "端口的进程有:");
            foreach (var item in list_process)
            {
                sb.Append(item + "
");
            }
            sb.AppendLine("是否要结束这些进程？");

            if (MessageBox.Show(sb.ToString(), "系统提示", MessageBoxButtons.YesNo) == DialogResult.No)
                return;
            PidKill(p, list_pid);
            MessageBox.Show("操作完成");

        }

        private static void PidKill(Process p, List<int> list_pid)
        {
            p.Start();
            foreach (var item in list_pid)
            {
                p.StandardInput.WriteLine("taskkill /pid " + item + " /f");
                p.StandardInput.WriteLine("exit");
            }
            p.Close();
        }

        private static List<int> GetPidByPort(Process p, int port)
        {
            int result;
            bool b = true;
            p.Start();
            p.StandardInput.WriteLine(string.Format("netstat -ano|find "{0}"", port));
            p.StandardInput.WriteLine("exit");
            StreamReader reader = p.StandardOutput;
            string strLine = reader.ReadLine();
            List<int> list_pid = new List<int>();
            while (!reader.EndOfStream)
            {
                strLine = strLine.Trim();
                if (strLine.Length > 0 && ((strLine.Contains("TCP") || strLine.Contains("UDP"))))
                {
                    Regex r = new Regex(@"s+");
                    string[] strArr = r.Split(strLine);
                    if (strArr.Length >= 4)
                    {
                        b = int.TryParse(strArr[3], out result);
                        if (b && !list_pid.Contains(result))
                            list_pid.Add(result);
                    }
                }
                strLine = reader.ReadLine();
            }
            p.WaitForExit();
            reader.Close();
            p.Close();
            return list_pid;
        }

        private static List<string> GetProcessNameByPid(Process p, List<int> list_pid)
        {
            p.Start();
            List<string> list_process = new List<string>();
            foreach (var pid in list_pid)
            {
                p.StandardInput.WriteLine(string.Format("tasklist |find "{0}"", pid));
                p.StandardInput.WriteLine("exit");
                StreamReader reader = p.StandardOutput;//截取输出流
                string strLine = reader.ReadLine();//每次读取一行

                while (!reader.EndOfStream)
                {
                    strLine = strLine.Trim();
                    if (strLine.Length > 0 && ((strLine.Contains(".exe"))))
                    {
                        Regex r = new Regex(@"s+");
                        string[] strArr = r.Split(strLine);
                        if (strArr.Length > 0)
                        {
                            list_process.Add(strArr[0]);
                        }
                    }
                    strLine = reader.ReadLine();
                }
                p.WaitForExit();
                reader.Close();
            }
            p.Close();

            return list_process;
        }