一个端口操作类PortHelper

　　此操作类主要使用了系统命令行来实现的，详细的命令可参照微软文档《如何使用"netsh advfirewall firewall"上下文而非“netsh firewall”上下文来控制 Windows Server 2008 和 Windows Vista 中的 Windows 防火墙行为》，而检查端口部分则利用Socket判断端口是否被占用，但是在也会有判断失灵的时候。

    public static class PortHelper
    {
        #region 命令原型
        //netsh firewall delete allowedprogram [AppPath]

        //netsh firewall add allowedprogram [appPath] [portName] ENABLE 

        //netsh firewall add portopening [ALL|TCP|UDP] [portID] [portName]

        //netsh firewall delete portopening [ALL|TCP|UDP] [portID]
        #endregion

        /// <summary>
        /// 判定指定端口号有否被占用
        /// </summary>
        /// <param name="portId">端口号</param>
        /// <returns></returns>
        public static bool IsAvaliable(int portId)
        {
            bool result;
            IPEndPoint point = new IPEndPoint(IPAddress.Parse("127.0.0.1"), portId);
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            try
            {
                socket.Bind(point);
                result = true;
            }
            catch (Exception ex)
            {
                result = false;
            }
            finally
            {
                socket.Close();
                socket.Dispose();
                socket = null;
            }
            return result;
        }

        #region 指定端口号

        /// <summary>
        /// 开放指定端口
        /// </summary>
        /// <param name="portName">端口名称</param>
        /// <param name="portId">端口号</param>
        /// <param name="type">协议类型</param>
        /// <returns></returns>
        public static bool OpenPortByID(string portName, int portId,ProtocolTypeName type)
        {
            string arg = string.Format("firewall add portopening {0} {1} {2}", type, portId, portName);
            string cmdResult = RunCMD("netsh", arg);
            if (cmdResult.Contains("确定"))
                return true;
            return false;
        }

        /// <summary>
        /// 开放指定的所有类型端口
        /// </summary>
        /// <param name="portName">端口名称</param>
        /// <param name="portId">端口号</param>
        /// <returns></returns>
        public static bool OpenPortByID(string portName, int portId)
        {
            return OpenPortByID(portName, portId, ProtocolTypeName.ALL);
        }

        /// <summary>
        /// 删除指定的所有类型端口
        /// </summary>
        /// <param name="portId">端口号</param>
        /// <returns></returns>
        public static bool DeletePortByID(int portId)
        {
            return DeletePortByID(portId, ProtocolTypeName.ALL);
        }

        /// <summary>
        /// 删除指定的端口
        /// </summary>
        /// <param name="portId">端口号</param>
        /// <param name="type">协议类型</param>
        /// <returns></returns>
        public static bool DeletePortByID(int portId, ProtocolTypeName type)
        {
            string arg = string.Format("firewall delete portopening {0} {1}", type, portId);
            string cmdResult = RunCMD("netsh", arg);
            if (cmdResult.Contains("确定"))
                return true;
            return false;
        }

        #endregion

        #region 指定应用程序

        /// <summary>
        /// 为指定应用程序开放端口
        /// </summary>
        /// <param name="appPath">应用程序路径</param>
        /// <param name="portName">端口名称</param>
        /// <returns></returns>
        public static bool OpenPortAppName(string appPath,string portName)
        {
            string arg = string.Format("firewall add allowedprogram {0} {1} ENABLE",appPath,portName);
            string cmdResult = RunCMD("netsh", arg);
            if (cmdResult.Contains("确定"))
                return true;
            return false;
        }

        /// <summary>
        /// 删除指定应用程序的端口
        /// </summary>
        /// <param name="appPath">应用程序路径</param>
        /// <returns></returns>
        public static bool DeletePortByAppName(string appPath)
        {
            string arg = string.Format("firewall delete allowedprogram {0}",appPath);
            string cmdResult = RunCMD("netsh", arg);
            if (cmdResult.Contains("确定"))
                return true;
            return false;
        }

        #endregion

        /// <summary>
        /// 执行命令
        /// </summary>
        /// <param name="cmd">命令名称</param>
        /// <param name="arg">参数</param>
        /// <returns></returns>
        private static string RunCMD(string cmd, string arg)
        {
            Process pro = new Process();
            pro.StartInfo = new ProcessStartInfo(cmd, arg);
            pro.StartInfo.UseShellExecute = false;
            pro.StartInfo.RedirectStandardOutput = true;
            pro.Start();
            pro.WaitForExit();
            string outputText = pro.StandardOutput.ReadToEnd();
            return outputText;
        }
    }

    public enum ProtocolTypeName
    { 
        ALL,
        TCP,
        UDP
    }