简单的 TCP 聊天应用程序 c#

Question

我尝试制作局域网聊天应用程序，使用 C# 中的 Send() 和 Receive() 函数来发送和接收消息。但问题是，当用户在控制台中输入消息并按 Enter 键盘时，此内容突然出现在控制台屏幕中，然后 WriteLine 我的表单出现（例如：我期望的是 You: hello）

我怎样才能删除行“你好”。我期待的是：
客户：嗨
你：你好

服务器代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;

namespace SimpleTcpSrvr
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;

            int recv;

            byte[] data = new byte[1024];

            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"),9050);

            Socket newsock = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

            newsock.Bind(ipep);

            newsock.Listen(10);

            Console.WriteLine("Waiting for a client...");

            Socket client = newsock.Accept();

            IPEndPoint clientep = (IPEndPoint)client.RemoteEndPoint;

            Console.WriteLine("Connected with {0} at port {1}",clientep.Address,clientep.Port);

            string welcome = "Welcome to my test server";

            data = Encoding.UTF8.GetBytes(welcome);

            client.Send(data,data.Length,SocketFlags.None);

            string input;

            while (true)
            {

                data = new byte[1024];

                recv = client.Receive(data);

                if (recv == 0)

                    break;

                Console.WriteLine("Client: "+Encoding.UTF8.GetString(data, 0, recv));

                input = Console.ReadLine();

                Console.WriteLine("You: " + input);

                client.Send(Encoding.UTF8.GetBytes(input));
            }

            Console.WriteLine("Disconnected from {0}", clientep.Address);

            client.Close();

            newsock.Close();

            Console.ReadLine();

        }
    }
}

客户代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.Sockets;

namespace SimpleTcpClient
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;

            byte[] data = new byte[1024];

            string input, stringData;

            IPEndPoint ipep = new IPEndPoint(IPAddress.Parse("127.0.0.1"),9050);

            Socket server = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);

            try
            {
                server.Connect(ipep);

            }
            catch(SocketException e)
            {
                Console.WriteLine("Unable to connect to server.");

                Console.WriteLine(e.ToString());

                return;
            }

            int recv = server.Receive(data);

            stringData = Encoding.UTF8.GetString(data, 0, recv);

            Console.WriteLine(stringData);

            while (true)
            {
                input = Console.ReadLine();

                if (input == "exit")

                    break;

                Console.WriteLine("You: " + input);

                server.Send(Encoding.UTF8.GetBytes(input));

                data = new byte[1024];

                recv = server.Receive(data);

                stringData = Encoding.UTF8.GetString(data, 0, recv);

                byte[] utf8string = System.Text.Encoding.UTF8.GetBytes(stringData);

                Console.WriteLine("Server: "+stringData);
            }

            Console.WriteLine("Disconnecting from server...");

            server.Shutdown(SocketShutdown.Both);

            server.Close();

            Console.WriteLine("Disconnected!");

            Console.ReadLine();

        }
    }
}

谢谢大家！

Answer 1

您可以试试这个，在 ReadLine 之后将光标位置设置回上一行的开头，然后用您的文本覆盖该行 - 在您的情况下，当您在前面加上“您：”时，您的输出字符串将比输入字符串 - 如果它更小，您可以用空格覆盖以清除任何多余的字符。

  input = Console.ReadLine();
  Console.SetCursorPosition(0, Console.CursorTop-1);
  Console.WriteLine("You: " + input);