C＃ - 发送和接收TCP / IP消息发送到IP地址和端口 [英] C# - Sending and Receiving a TCP/IP message to an IP Address and Port

问题描述

我有以下代码发送一个TCP / IP消息发送到一个特定的IP地址和端口：

I have the following code to send a TCP/IP message to a specific IP Address and Port:

public bool sendTCPMessage(string ip_address, string port, string transaction_id, string customer_username, DateTime date)
        {
            bool success = false;

            try
            {
                int converted_port = Convert.ToInt32(port);
                string converted_date = date.ToString("dd/MM/yyyy HH:mm:ss", CultureInfo.InvariantCulture);

                JObject obj = new JObject();
                obj["Transaction_Status"] = "Paid";
                obj["Transaction_ID"] = transaction_id;
                obj["Processed_Date"] = converted_date;
                obj["Customer_Username"] = customer_username;

                JSONMobile json_mobile = new JSONMobile();
                string json = json_mobile.SerializeToString(obj);

                TcpClient client = new TcpClient(ip_address, converted_port);
                Byte[] message = System.Text.Encoding.ASCII.GetBytes(json);
                NetworkStream stream = client.GetStream();
                stream.Write(message, 0, message.Length);
                stream.Close();
                client.Close();

                success = true;
            }
            catch (Exception)
            {
                success = false;
            }
            return success;
        }

现在，让我们假设我通过IP_ADDRESS为127.0.0.1及端口为'1'。当方法执行，我得到了以下异常：

Now, let us assume that I pass the ip_address as '127.0.0.1' and the port as '1'. When the method executes, I am getting the following exception:

这是因为happenning有没有人在另一端听吗？如果是的话，我怎么能建立一个服务器在该IP地址（好吧，不0.0.0.45但127.0.0.1）和端口号来接受和回复信息呢？谢谢：）

Is this happenning because there is no one listening at the other end? If yes, how can I set up a server at that ip address (ok, not 0.0.0.45 but 127.0.0.1) and port number to accept the message and reply to it? Thank you :)

推荐答案

您会需要的 的TcpListener 对象作为服务器行事。在的TcpListener 对象将侦听指定端口上的连接。您可以使用 。 AcceptTcpClient 方法来建立一个新的连接。 （如果你想多个客户端，你不得不考虑多线程）

You'd need a TcpListener object to act as the server. The TcpListener object would listen for incoming connections on the specified port. You can use the .AcceptTcpClient method to establish a new connection. (If you wanted multiple clients you'd have to look into multithreading)

此外，使用端口1将是不好的做法一个侧面说明，低端口号通常保留给系统的东西或标准协议，如远程登录， FTP ， HTTP 等

Also as a side note using Port 1 would be bad practice, low port numbers are usually reserved for system stuff or standard protocols such as telnet, ftp, http etc.

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