在C#中,如何检查TCP端口是否可用?
在C#中使用TcpClient或通常连接到套接字,如何首先检查计算机上某个端口是否空闲?
更多信息: 这是我使用的代码:
TcpClient c;//I want to check here if port is free.
c = new TcpClient(ip, port);
回答:
由于您使用TcpClient
,这意味着您正在检查打开的TCP端口。System.Net.NetworkInformation命名空间中有很多可用的好对象。
使用IPGlobalProperties
对象获取对象数组,TcpConnectionInformation
然后可以查询对象的端点IP和端口。
int port = 456; //<--- This is your value bool isAvailable = true;
// Evaluate current system tcp connections. This is the same information provided
// by the netstat command line application, just in .Net spanly-typed object
// form. We will look through the list, and if our port we would like to use
// in our TcpClient is occupied, we will set isAvailable to false.
IPGlobalProperties ipGlobalProperties = IPGlobalProperties.GetIPGlobalProperties();
TcpConnectionInformation[] tcpConnInfoArray = ipGlobalProperties.GetActiveTcpConnections();
foreach (TcpConnectionInformation tcpi in tcpConnInfoArray)
{
if (tcpi.LocalEndPoint.Port==port)
{
isAvailable = false;
break;
}
}
// At this point, if isAvailable is true, we can proceed accordingly.
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