C#指定指定端口是否已經被占用的代碼

下面的C#代碼定義了一個函數用于判斷指定的端口是否已經被占用。
代碼轉自： http://www.cnblogs.com/smiler/

public static bool PortInUse(int port)
{
    bool inUse = false;


IPGlobalProperties ipProperties = IPGlobalProperties.GetIPGlobalProperties();
IPEndPoint[] ipEndPoints = ipProperties.GetActiveTcpListeners();

foreach (IPEndPoint endPoint in ipEndPoints)
{
    if (endPoint.Port == port)
    {
        inUse = true;
        break;
    }
}

return inUse;

}</pre> 

 下面的范例代碼占用了8080端口，然后用上面定義的函數檢測端口是否被占用
static void Main(string[] args)
{
    HttpListener httpListner = new HttpListener();
    httpListner.Prefixes.Add("http://*:8080/&quot;);
    httpListner.Start();


Console.WriteLine("Port: 8080 status: " + (PortInUse(8080) ? "in use" : "not in use"));

Console.ReadKey();

httpListner.Close();

}</pre>