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;
}