很多时候，我们的程序是通过网络通信（如TCP或者UDP协议+端口），而将制作好的程序安装包给客户用时，发现会出现不能通信的现象（或者在这台电脑是可以的，却在另一台不可以），原因是防火墙阻止了，需要添加防火墙例外。现在将代码记录下来，方便以后备用。

在Visual studio 项目引用右键里面添加引用，选中COM然后找到NetFwTypeLib，确认，然后新建类FireWallHelp.cs添加

using NetFwTypeLib;

代码如下

using System;
using System.Collections.Generic;
using System.Text;
using NetFwTypeLib;

namespace FireWallTest
{
    public  class FireWallHelp
    {
        /// <summary>
        /// 添加防火墙例外端口
        /// </summary>
        /// <param name="name">名称</param>
        /// <param name="port">端口</param>
        /// <param name="protocol">协议(TCP、UDP)</param>
        public static void NetFwAddPorts(string name, int port, string protocol)
        {
            //创建firewall管理类的实例
            INetFwMgr netFwMgr = (INetFwMgr)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwMgr"));

            INetFwOpenPort objPort = (INetFwOpenPort)Activator.CreateInstance(
                Type.GetTypeFromProgID("HNetCfg.FwOpenPort"));

            objPort.Name = name;
            objPort.Port = port;
            if (protocol.ToUpper() == "TCP")
            {
                objPort.Protocol = NET_FW_IP_PROTOCOL_.NET_FW_IP_PROTOCOL_TCP;
            }
            else
            {
                objPort.Protocol = NET_FW_IP_PROTOCOL_.NET_FW_IP_PROTOCOL_UDP;
            }
            objPort.Scope = NET_FW_SCOPE_.NET_FW_SCOPE_ALL;
            objPort.Enabled = true;

            bool exist = false;
            //加入到防火墙的管理策略
            foreach (INetFwOpenPort mPort in netFwMgr.LocalPolicy.CurrentProfile.GloballyOpenPorts)
            {

                if (objPort == mPort)
                {
                    exist = true;
                    break;
                }
            }
            if (exist)
            {
                System.Windows.Forms.MessageBox.Show("exist"); 
            }
            if (!exist) netFwMgr.LocalPolicy.CurrentProfile.GloballyOpenPorts.Add(objPort);
        }
        /// <summary>
        /// 将应用程序添加到防火墙例外
        /// </summary>
        /// <param name="name">应用程序名称</param>
        /// <param name="executablePath">应用程序可执行文件全路径</param>
        public static void NetFwAddApps(string name, string executablePath)
        {
            //创建firewall管理类的实例
            INetFwMgr netFwMgr = (INetFwMgr)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwMgr"));

            INetFwAuthorizedApplication app = (INetFwAuthorizedApplication)Activator.CreateInstance(
                Type.GetTypeFromProgID("HNetCfg.FwAuthorizedApplication"));

            //在例外列表里，程序显示的名称
            app.Name = name;

            //程序的路径及文件名
            app.ProcessImageFileName = executablePath;

            //是否启用该规则
            app.Enabled = true;

            //加入到防火墙的管理策略
            netFwMgr.LocalPolicy.CurrentProfile.AuthorizedApplications.Add(app);

            bool exist = false;
            //加入到防火墙的管理策略
            foreach (INetFwAuthorizedApplication mApp in netFwMgr.LocalPolicy.CurrentProfile.AuthorizedApplications)
            {
                if (app == mApp)
                {
                    exist = true;
                    break;
                }
            }
            if (!exist) netFwMgr.LocalPolicy.CurrentProfile.AuthorizedApplications.Add(app);
        }
        /// <summary>
        /// 删除防火墙例外端口
        /// </summary>
        /// <param name="port">端口</param>
        /// <param name="protocol">协议（TCP、UDP）</param>
        public static void NetFwDelApps(int port, string protocol)
        {
            INetFwMgr netFwMgr = (INetFwMgr)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwMgr"));
            if (protocol == "TCP")
            {
                netFwMgr.LocalPolicy.CurrentProfile.GloballyOpenPorts.Remove(port, NET_FW_IP_PROTOCOL_.NET_FW_IP_PROTOCOL_TCP);
            }
            else
            {
                netFwMgr.LocalPolicy.CurrentProfile.GloballyOpenPorts.Remove(port, NET_FW_IP_PROTOCOL_.NET_FW_IP_PROTOCOL_UDP);
            }
        }
        /// <summary>
        /// 删除防火墙例外中应用程序
        /// </summary>
        /// <param name="executablePath">程序的绝对路径</param>
        public static void NetFwDelApps(string executablePath)
        {
            INetFwMgr netFwMgr = (INetFwMgr)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwMgr"));

            netFwMgr.LocalPolicy.CurrentProfile.AuthorizedApplications.Remove(executablePath);

        }
    }
}