C# udp 文本内容提取

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace udp
{
    public partial class Form1 : Form
    {
        private UdpClient sendUdpClient;
        private UdpClient receiveUpdClient;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            sendUdpClient = new UdpClient();
            receiveUpdClient = new UdpClient(9999);
            this.txtSendText.Focus();

            Control.CheckForIllegalCrossThreadCalls = false;
            Thread thread = new Thread(receive);
            thread.Start();
        }

        private void receive()
        {

            while (true)
            {
                Socket socket = receiveUpdClient.Client;
                byte[] b = new byte[1024];
                 socket.Receive(b);
                ////IPAddress ip = ((System.Net.IPEndPoint)socket.RemoteEndPoint).Port;
                //MessageBox.Show(((System.Net.IPEndPoint)socket.RemoteEndPoint).Port + "");
                string message = Encoding.Default.GetString(b);
                this.richTextBox1.Text += "\n" + message;

            }

        }
        private void btnsend_Click(object sender, EventArgs e)
        {
            byte[] sendbytes = Encoding.Default.GetBytes(this.txtSendText.Text);
            sendUdpClient.Send(sendbytes, sendbytes.Length, "192.168.23.138", 9999);
        }
        int a = 0;
        private void btnload_Click(object sender, EventArgs e)
        {
            FileStream fs = File.OpenRead("E:\\汤姆叔叔的小屋.txt");

            byte[] b = new byte[1024];
            fs.Position = 1024*a;
            fs.Read(b, 0, b.Length);

            string text = Encoding.Default.GetString(b);
            this.richTextBox1.Text = text;
            a++;
        }
    }
}

C# udp 文本内容提取