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private void Listen(object obj) //建立与客户端的连接
{
	CancellationToken ct = (CancellationToken)obj;
	while (!ct.IsCancellationRequested) /*！此处问题！*/
	{
		try
		{
			......//省略
		}
		catch (SocketException) { }
	}
}

public int ListenPort
{
	get { return _listenPort; }
	set
	{
		try
		{
			if (listenThread != null)
				listenCTS.Cancel();  /*！此处问题！*/

			......//省略

			//开启线程Accept进行通信的客户端socket
			listenThread = new Thread(Listen)
			{
				IsBackground = true    //运行线程在后台执行
			};   //线程绑定Listen函数
			listenThread.Start(listenCTS.Token);  /*！此处问题！*/    //Start里面的参数是Listen函数所需要的参数 

			_listenPort = value;
		}
		catch (SocketException)
		{
			MessageBox.Show("监听程序启动失败，请尝试重新设置监听端口");
		}
	}
}

public class Server
{
	......//省略
	private readonly CancellationTokenSource? listenCTS;
	......//省略
}