HttpListener关闭抛异常问题

问题:http关闭后，task估计还在运行，断点打不到，
异常信息：System.Net.HttpListenerException (0x80004005): 由于线程退出或应用
程序请求，已中止 I/O 操作。在 System.Net.HttpListener.GetContext()
代码：
方法调用
static void Main(string[]args){
HttpServer.Start();
Thread.Sleep(2000);
HttpServer.Stop();
Console.ReadKey();
}
public class HttpServer{
private static HttpListener httpListener;
private static CancellationTokenSource cancelToken;
public static void Start(){
httpListener = new HttpListener();
httpListener.Prefixes.Add("http://+:8048/");
httpListener.Start();
cancelToken = new CancellationTokenSource();
Task.Run(() => { handlehttp(); }, cancelToken.Token);
}
public static void Stop(){
httpListener.Stop();
httpListener.Close();
cancelToken.Cancel();
}
private void handlehttp(){
while(true){
try{
if (cancelToken.IsCancellationRequested)
{
break;
}
if(!httpListener.IsListening){break;}
var context = httpListener.GetContext();//结束这句一直报错
}catch(Exception ex){
}
}
}
}