C#获取Windows进程监听的TCP/UDP端口实例
1、在windows下用cmd netstat命令可以获得当前进程监听端口号的信息，如netstat -ano可以看到ip、port、状态和监听的pid。
那么可以执行cmd这个进程得到监听的端口号信息，c#代码如下：
//进程id
int pid = procinfo.processid;
//存放进程使用的端口号链表
list<int> ports = new list<int>();
process pro = new process();
pro.startinfo.filename = "cmd.exe";
pro.startinfo.useshellexecute = false;
pro.startinfo.redirectstandardinput = true;
pro.startinfo.redirectstandardoutput = true;
pro.startinfo.redirectstandarderror = true;
pro.startinfo.createnowindow = true;
pro.start();
pro.standardinput.writeline("netstat -ano");
pro.standardinput.writeline("exit");
regex reg = new regex("\\s+", regexoptions.compiled);
string line = null;
ports.clear();
while ((line = pro.standardoutput.readline()) != null)
{
line = line.trim();
if (line.startswith("tcp", stringcomparison.ordinalignorecase))
{
line = reg.replace(line, ",");
string[] arr = line.split(',');
if (arr[4] == pid.tostring())
{
string soc = arr[1];
int pos = soc.lastindexof(':');
int pot = int.parse(soc.substring(pos + 1));
ports.add(pot);
}
}
else if (line.startswith("udp", stringcomparison.ordinalignorecase))
{
line = reg.replace(line, ",");
string[] arr = line.split(',');
if (arr[3] == pid.tostring())
{
string soc = arr[1];
int pos = soc.lastindexof(':');
int pot = int.parse(soc.substring(pos + 1));
ports.add(pot);
}
}
}
pro.close();