tcpipSocket/Echo/Client/Client.cs

using System.Net;
using System.Net.Sockets;
using System.Text;

namespace Client;

internal class Client
{
	static void Main(string[] args)
	{
		using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
		{
			IPEndPoint endPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 20000);
			socket.Connect(endPoint);

			while (true)
			{
				string str = Console.ReadLine();
				if (str == "exit")
					return;

				byte[] buffer = Encoding.UTF8.GetBytes(str);
				socket.Send(buffer);

				byte[] buffer2 = new byte[256];
				int byteRead = socket.Receive(buffer2);
				if (byteRead < 1)
				{
					Console.WriteLine("Disconnecting server...");
					return;
				}

				string str2 = Encoding.UTF8.GetString(buffer2);
				Console.WriteLine($"[Receive] {str2}");
			}
		}
	}
}