C# UDPを使ったメッセージ交換

UDPを使ったテストプログラム。

using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace TestChat
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            StartReceive();
            button1.Click += new EventHandler(SendMessage);
        }

        public class UdpState
        {
            public UdpClient UdpClient;
            public IPEndPoint IPEndPoint;
            public UdpState(UdpClient udpClient, IPEndPoint endPoint)
            {
                UdpClient = udpClient;
                IPEndPoint = endPoint;
            }
        }

        public class Message
        {
            private List<string> TextList = new List<string>();
            private static Message Instance = null;

            public static Message GetInstance()
            {
                if(Instance == null)
                {
                    Instance = new Message();
                }
                return Instance;
            }

            public void SetMessage(string text)
            {
                TextList.Add(text);
            }

            public string GetMessage()
            {
                return string.Join("\r\n", TextList.ToArray().Reverse());
            }

        }

        private void StartReceive()
        {
            IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 2002);
            UdpClient udpClient = new UdpClient(endPoint);
            udpClient.BeginReceive(ReceiveCallback, new UdpState(udpClient, endPoint));
        }

        private void ReceiveCallback(IAsyncResult ar)
        {
            UdpClient udpClient = ((UdpState)ar.AsyncState).UdpClient;
            IPEndPoint endPoint = ((UdpState)ar.AsyncState).IPEndPoint;

            byte[] receiveByte = udpClient.EndReceive(ar,ref endPoint);
            string receiveString = Encoding.UTF8.GetString(receiveByte);
            textBox1.BeginInvoke(new Action<string>(ShowReceive), receiveString);

            udpClient.BeginReceive(ReceiveCallback, new UdpState(udpClient, endPoint));
        }

        private void ShowReceive(string s)
        {
            Message message = Message.GetInstance();
            message.SetMessage(s);
            textBox1.Text = message.GetMessage();
        }

        private async void SendMessage(object sender, EventArgs e)
        {
            UdpClient udpClient = new UdpClient();
            udpClient.Connect(new IPEndPoint(IPAddress.Parse("192.168.11.18"), 2002));

            byte[] sendByte = Encoding.UTF8.GetBytes(textBox2.Text);
            await udpClient.SendAsync(sendByte, sendByte.Length);
            udpClient.Close();
        }
    }
}

using System;

using System.Text;

using System.Linq;

using System.Collections.Generic;

using System.Windows.Forms;

using System.Net;

using System.Net.Sockets;

namespace TestChat

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

StartReceive();

button1.Click += new EventHandler(SendMessage);

}

public class UdpState

{

public UdpClient UdpClient;

public IPEndPoint IPEndPoint;

public UdpState(UdpClient udpClient, IPEndPoint endPoint)

{

UdpClient = udpClient;

IPEndPoint = endPoint;

}

public class Message

{

private List<string> TextList = new List<string>();

private static Message Instance = null;

public static Message GetInstance()

{

if(Instance == null)

{

Instance = new Message();

}

return Instance;

}

public void SetMessage(string text)

{

TextList.Add(text);

}

public string GetMessage()

{

return string.Join("\r\n", TextList.ToArray().Reverse());

}

private void StartReceive()

{

IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 2002);

UdpClient udpClient = new UdpClient(endPoint);

udpClient.BeginReceive(ReceiveCallback, new UdpState(udpClient, endPoint));

}

private void ReceiveCallback(IAsyncResult ar)

{

UdpClient udpClient = ((UdpState)ar.AsyncState).UdpClient;

IPEndPoint endPoint = ((UdpState)ar.AsyncState).IPEndPoint;

byte[] receiveByte = udpClient.EndReceive(ar,ref endPoint);

string receiveString = Encoding.UTF8.GetString(receiveByte);

textBox1.BeginInvoke(new Action<string>(ShowReceive), receiveString);

udpClient.BeginReceive(ReceiveCallback, new UdpState(udpClient, endPoint));

}

private void ShowReceive(string s)

{

Message message = Message.GetInstance();

message.SetMessage(s);

textBox1.Text = message.GetMessage();

}

private async void SendMessage(object sender, EventArgs e)

{

UdpClient udpClient = new UdpClient();

udpClient.Connect(new IPEndPoint(IPAddress.Parse("192.168.11.18"), 2002));

byte[] sendByte = Encoding.UTF8.GetBytes(textBox2.Text);

await udpClient.SendAsync(sendByte, sendByte.Length);

udpClient.Close();

}