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