async socket telnet

MySolution/ConsoleApp/TelnetSamples/AsyncSocketTelnetClient.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp.TelnetSamples
+{
+	internal class AsyncSocketTelnetClient : IAsyncTelnetClient
+	{
+		private readonly CancellationTokenSource CTS = new CancellationTokenSource();
+
+		public event EventHandler<string> MessageCallback;
+
+		private Socket _socket;
+
+		public async void Connect(string ip, int port = 23)
+		{
+			try
+			{
+				Close();
+
+				_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+				_socket.ReceiveTimeout = 1000;
+
+				IPAddress ipAddress = Dns.GetHostAddresses(ip)[0];
+				IPEndPoint iPEndPoint = new IPEndPoint(ipAddress, port);
+				await _socket.ConnectAsync(iPEndPoint);
+
+				Task.Run(ReadAsync);
+			}
+			catch (Exception)
+			{
+				throw;
+			}
+		}
+
+		private async void ReadAsync()
+		{
+			try
+			{
+
+				StringBuilder sb = new StringBuilder();
+				byte[] readBuffer = new byte[1024];
+				while (true)
+				{
+					int bytesRead = await _socket.ReceiveAsync(readBuffer);
+					if (bytesRead < 1)
+						break;
+
+					string data = Encoding.ASCII.GetString(readBuffer, 0, bytesRead);
+					sb.Append(data);
+
+					if (!data.EndsWith("\r\n>"))
+						continue;
+
+					// 에코 삭제
+					string read = sb.ToString();
+					int rnIdx = read.IndexOf("\r\n");
+					read = read.Substring(rnIdx + 1);
+
+					if (this.MessageCallback != null)
+						this.MessageCallback(this, read);
+
+					sb.Clear();
+				}
+			}
+			catch (Exception)
+			{
+				throw;
+			}
+		}
+
+		public async void SendCommand(string command)
+		{
+			try
+			{
+				command += "\r\n";
+				byte[] sendBytes = Encoding.ASCII.GetBytes(command);
+				await _socket.SendAsync(sendBytes);
+			}
+			catch (Exception)
+			{
+				throw;
+			}
+		}
+
+		public void Close()
+		{
+			try
+			{
+				if (_socket == null)
+					return;
+
+				_socket.Shutdown(SocketShutdown.Both);
+				_socket.Close();
+				_socket.Dispose();
+			}
+			catch (Exception)
+			{
+				throw;
+			}
+		}
+	}
+}