c# 判断端口是否被占用

这里主要用到：命名空间System.Net.NetworkInformation下定义了一个名为IPGlobalProperties的类

具体代码

    class PortHelper
    {

        #region 指定类型的端口是否已经被使用了
        /// <summary>
        /// 指定类型的端口是否已经被使用了
        /// </summary>
        /// <param name="port">端口号</param>
        /// <param name="type">端口类型</param>
        /// <returns></returns>
        public bool portInUse(int port,PortType type)
        {
            bool flag = false;
            IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
            IPEndPoint[] ipendpoints = null;
            if (type == PortType.TCP)
            {
                ipendpoints = properties.GetActiveTcpListeners();
            }
            else
            {
                ipendpoints = properties.GetActiveUdpListeners();
            }
            foreach (IPEndPoint ipendpoint in ipendpoints)
            {
                if (ipendpoint.Port == port)
                {
                    flag = true;
                    break;
                }
            }
            ipendpoints = null;
            properties = null;
            return flag;
        }
        #endregion

    }

    #region 端口枚举类型
    /// <summary>
    /// 端口类型
    /// </summary>
    enum PortType
    {
        /// <summary>
        /// TCP类型
        /// </summary>
        TCP,
        /// <summary>
        /// UDP类型
        /// </summary>
        UDP
    }
    #endregion