C# 获得空闲可用端口

迷南。 2022-05-28 03:52 127阅读 0赞

转自论坛：[http://topic.csdn.net/u/20100603/13/ef349c6e-66ee-4129-a884-61c9091a9a99.html][http_topic.csdn.net_u_20100603_13_ef349c6e-66ee-4129-a884-61c9091a9a99.html]

using System.Net.NetworkInformation;

/// <summary>  
/// 获取第一个可用的端口号  
/// </summary>  
/// <returns></returns>  
public static int GetFirstAvailablePort()  
\{  
int MAX\_PORT = 6000; //系统tcp/udp端口数最大是65535  
int BEGIN\_PORT = 5000;//从这个端口开始检测

for (int i = BEGIN\_PORT; i < MAX\_PORT; i++)  
\{  
if (PortIsAvailable(i)) return i;  
\}

return -1;  
\}

/// <summary>  
/// 获取操作系统已用的端口号  
/// </summary>  
/// <returns></returns>  
public static IList PortIsUsed()  
\{  
//获取本地计算机的网络连接和通信统计数据的信息  
IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();

//返回本地计算机上的所有Tcp监听程序  
IPEndPoint\[\] ipsTCP = ipGlobalProperties.GetActiveTcpListeners();

//返回本地计算机上的所有UDP监听程序  
IPEndPoint\[\] ipsUDP = ipGlobalProperties.GetActiveUdpListeners();

//返回本地计算机上的Internet协议版本4(IPV4 传输控制协议(TCP)连接的信息。  
TcpConnectionInformation\[\] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpConnections();

IList allPorts = new ArrayList();  
foreach (IPEndPoint ep in ipsTCP) allPorts.Add(ep.Port);  
foreach (IPEndPoint ep in ipsUDP) allPorts.Add(ep.Port);  
foreach (TcpConnectionInformation conn in tcpConnInfoArray) allPorts.Add(conn.LocalEndPoint.Port);

return allPorts;  
\}

/// <summary>  
/// 检查指定端口是否已用  
/// </summary>  
/// <param name="port"></param>  
/// <returns></returns>  
public static bool PortIsAvailable(int port)  
\{  
bool isAvailable = true;

IList portUsed = PortIsUsed();

foreach (int p in portUsed)  
\{  
if (p == port)  
\{  
isAvailable = false; break;  
\}  
\}

return isAvailable;  
\}

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