自动获取本机IP和空闲端口_手写自动获取空闲ip-优快云博客

本文链接：https://blog.youkuaiyun.com/lz806009150/article/details/77009108

该博客介绍了一种方法来获取本机的IPv4地址和寻找可用的UDP端口。通过Dns.GetHostEntry获取主机名的IP地址列表，筛选出InterNetwork类型的IP。同时，使用System.Net.NetworkInformation库查找从指定起始端口开始的下一个可用UDP端口，确保在IPEndPoint的最大端口范围内。

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//获取本机IP

void GetAddressIP()
        {
            ///获取本地的IP地址
            string AddressIP = string.Empty;
            foreach (IPAddress _IPAddress in  Dns.GetHostEntry(Dns.GetHostName()).AddressList)
            {
                if (_IPAddress.AddressFamily.ToString() == "InterNetwork")
                {
                    AddressIP = _IPAddress.ToString();
                }
            }
            txtLocalIP.Text = AddressIP;
        }

//获取端口号

using System.Net.NetworkInformation;
 private const string PortReleaseGuid = "8875BD8E-4D5B-11DE-B2F4-691756D89593";
          public void FindNextAvailableUDPPort(int startPort) 
          { 
              port = startPort; 
              bool isAvailable = true;

              var mutex = new Mutex(false, 
                  string.Concat("Global/", PortReleaseGuid)); 
              mutex.WaitOne(); 
              try 
              { 
                  IPGlobalProperties ipGlobalProperties = 
                      IPGlobalProperties.GetIPGlobalProperties(); 
                  IPEndPoint[] endPoints = 
                      ipGlobalProperties.GetActiveUdpListeners();

                  do 
                  { 
                      if (!isAvailable) 
                      { 
                          port++; 
                          isAvailable = true; 
                      }

                      foreach (IPEndPoint endPoint in endPoints) 
                      { 
                          if (endPoint.Port != port) 
                              continue; 
                          isAvailable = false; 
                          break; 
                      }

                  } while (!isAvailable && port < IPEndPoint.MaxPort);

                  if (!isAvailable) 
                      throw new ApplicationException("Not able to find a free TCP port.");
                  
                // return port; 
              } 
              finally 
              { 
                  mutex.ReleaseMutex(); 
              }
              servePORT.Text=port.ToString();
          
          }