C#使用UdpClient發送和接收UDP數據示例 16進制與字符串互轉

1.服務器

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Server(10086); //監聽10086端口
        }

        /// <summary>
        /// 服務器端
        /// </summary>
        /// <param name="port"></param>
        static void Server(int port)
        {
            try
            {
                UdpClient udpclient = new UdpClient(port);
                while (true)
                {                    
                    IPEndPoint ipendpoint = null;
                    byte[] bytes = udpclient.Receive(ref ipendpoint); //停在這等待數據
                    string data = Encoding.Default.GetString(bytes, 0, bytes.Length);                    

                    Console.WriteLine("{0:HH:mm:ss}->接收數據(from {1}:{2})：{3}", DateTime.Now, ipendpoint.Address, ipendpoint.Port, data);
                }
                udpclient.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine("{0:HH:mm:ss}->{1}", DateTime.Now, ex.Message);
            }
            Console.ReadKey();
        }
    }
}

2.客戶端

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Client("127.0.0.1", 10086, "play"); //發送數據
        }

        /// <summary>
        /// 客戶端
        /// </summary>
        /// <param name="ip"></param>
        /// <param name="port"></param>
        /// <param name="message"></param>
        static void Client(string ip, int port, string message)
        {
            try
            {
                UdpClient udpclient = new UdpClient();
                IPEndPoint ipendpoint = new IPEndPoint(IPAddress.Parse(ip), port);
                byte[] data = Encoding.Default.GetBytes(message);
                udpclient.Send(data, data.Length, ipendpoint);
                udpclient.Close();

                Console.WriteLine("{0:HH:mm:ss}->發送數據(to {1})：{2}", DateTime.Now, ip, message);
            }
            catch (Exception ex)
            {
                Console.WriteLine("{0:HH:mm:ss}->{1}", DateTime.Now, ex.Message);
            }
            Console.ReadKey();
        }
    }
}

3. 字符串轉16進制，然後直接發送16進制。

public static byte[] HexStringToByteArray(string s)
        {
            if (s.Length = 0)
                throw new Exception("將16進制字符串轉換成字節數組時出錯，錯誤信息：被轉換的字符串長度爲0。");
            s = s.Replace(" ", "");
            byte[] buffer = new byte[s.Length / 2];
            for (int i = 0; i < s.Length; i += 2)
                buffer[i / 2] = Convert.ToByte(s.Substring(i, 2), 16);
            return buffer;
        }

4.16進制轉字符串，接收端用於識別顯示

        /// <summary>
        /// 字節數組轉換成十六進制字符串(不帶空格)
        /// </summary>
        /// <param name="data">要轉換的字節數組</param>
        /// <returns>轉換後的字符串</returns>
        public static string ByteArrayToHexStringNoBlank(byte[] data)
        {
            StringBuilder sb = new StringBuilder(data.Length * 3);
            foreach (byte b in data)
                sb.Append(Convert.ToString(b, 16).PadLeft(2, '0'));
            return sb.ToString().ToUpper();
        }

客戶端與服務器代碼轉載自：http://www.mzwu.com/article.asp?id=3775