C# "Sometimes"客户端断开连接后，套接字监听器出现错误

Question

很难说出这里问的是什么。这个问题是模棱两可的、模糊的、不完整的、过于宽泛的或修辞的，无法以目前的形式得到合理的回答。如需帮助澄清这个问题以便重新打开它，visit the help center .




9年前关闭。




我是 C# 新手，之所以选择它，是因为我必须为客户端编写服务器监听器……我将构建一个带有线程的服务器，它可以毫无问题地监听多个客户端，但有时当客户端断开连接时，服务器会出错。

System.InvalidOperationException: the operation is not allowed non-connected

这是我接收数据包的代码:

NetworkStream networkStream = clientSocket.GetStream();
networkStream.Read(bytesFrom, 0, 312);
dataFromClient = Encoding.ASCII.GetString(bytesFrom);

string hex = BitConverter.ToString(bytesFrom).Replace("-","");
Console.WriteLine("\n " + hex + "\n_______________()()()______________");

这是带有错误的控制台屏幕截图:
Screenshot Link

Answer 1

TcpClient.GetStream()如果套接字未连接或不再连接，将抛出异常。

将代码包装在 try..catch block 中:

try
{
    NetworkStream networkStream = clientSocket.GetStream();
    networkStream.Read(bytesFrom, 0, 312);
    dataFromClient = Encoding.ASCII.GetString(bytesFrom);

    string hex = BitConverter.ToString(bytesFrom).Replace("-","");
    Console.WriteLine("\n " + hex + "\n_______________()()()______________");
} 
catch (InvalidOperationException ioex)
{       
    // The TcpClient is not connected to a remote host.
}
catch (ObjectDisposedException odex)
{
    // The TcpClient has been closed.
}