Get PID of process using some port [duplicate]

This question already has answers here: 开发者_JAVA百科 How do I get process name of an open port in C#? (4 answers) Closed 10 months ago.

I need a way of, given a tcp port number, discover if there's some process using that port (and get the process id).

Something like netstat does but programmatically.

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This is probably too late for the original poster but someone else may find it useful. You can use the PowerShell class in the System.Management.Automation namespace.

private static IEnumerable<uint> ProcessesUsingPorts(uint id)
{
    PowerShell ps = PowerShell.Create();
    ps.AddCommand("Get-NetTCPConnection").AddParameter("LocalPort", id);
    return ps.Invoke().Select(p => (uint)p.Properties["OwningProcess"].Value);
}