C# 根据端口关闭线程

        public static void StopProcess()
        {
            string port = "5000";
            Process pro = new Process();

            // 设置命令行、参数
            pro.StartInfo.FileName = "cmd.exe";
            pro.StartInfo.UseShellExecute = false;
            pro.StartInfo.RedirectStandardInput = true;
            pro.StartInfo.RedirectStandardOutput = true;
            pro.StartInfo.RedirectStandardError = true;
            pro.StartInfo.CreateNoWindow = true;
            // 启动CMD
            pro.Start();
            // 运行端口检查命令
            pro.StandardInput.WriteLine("netstat -ano");
            pro.StandardInput.WriteLine("exit");

            // 获取结果
            Regex reg = new Regex(@"\s ", RegexOptions.Compiled);
            string line = null;
            while ((line = pro.StandardOutput.ReadLine()) != null)
            {
                line = line.Trim();
                if (line.StartsWith("TCP", StringComparison.OrdinalIgnoreCase))
                {
                    line = reg.Replace(line, ",");

                    string[] arr = line.Split(',');
                    if (arr[2].EndsWith(":" + port))
                    {
                        KillProcess(Int32.Parse(arr[13]));
                    }

                }
            }
        }

        public static void KillProcess(int processName) //调用方法，传参
        {
            try
            {
                //    //  Process[] thisproc = Process.GetProcessesByName(processName);
                Process thisproc = Process.GetProcessById(processName);
                if (!thisproc.CloseMainWindow()) //尝试关闭进程 释放资源
                {
                    thisproc.Kill(); //强制关闭
                }
            }
            catch //出现异常，表明 kill 进程失败
            {
            }
            finally
            {

            }

        }