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This article mainly introduces how to achieve socket sending and receiving data in C#, which has a certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let the editor take you to know it.

The details are as follows

Server side

Namespace TestServer {public partial class ServerForm: Form {Socket socketSend; / / stores the IP address and socket of remotely connected clients in the collection Dictionary dicSocket = new Dictionary (); public ServerForm () {InitializeComponent () } private void btnStart_Click (object sender, EventArgs e) {try {/ / when you click to start listening, create a socket Socket socketWatch = new Socket (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) on the server to listen for the IP address and port number; IPAddress ip = IPAddress.Any;// IPAddress.Parse (txtServer.Text) IPEndPoint point = new IPEndPoint (ip, Convert.ToInt32 (txtPort.Text)); / / Monitoring socketWatch.Bind (point); ShowMsg ("listening successfully"); socketWatch.Listen (10); Thread th = new Thread (Listen); th.IsBackground = true Th.Start (socketWatch);} catch {}} void Listen (object o) {/ / wait for the client to connect and create a Socket Socket socketWatch = o as Socket; while (true) {socketSend = socketWatch.Accept () responsible for communication DicSocket.Add (socketSend.RemoteEndPoint.ToString (), socketSend); cboUsers.Items.Add (socketSend.RemoteEndPoint.ToString ()); ShowMsg (socketSend.RemoteEndPoint.ToString () + ":" + "connection successful"); Thread th = new Thread (Recive); th.IsBackground = true; th.Start (socketSend) }} void Recive (object o) {socketSend = o as Socket; while (true) {/ / after the client connects successfully, the server should accept the message byte [] buffer = new byte [1024 * 1024 * 2] from the client. / / actual received valid bytes int r = socketSend.Receive (buffer); if (r = 0) {break;} string str = Encoding.UTF8.GetString (buffer, 0, r); ShowMsg (socketSend.RemoteEndPoint + ":" + str) }} void ShowMsg (string str) {txtLog.AppendText (str + "\ r\ n");} private void Form1_Load (object sender, EventArgs e) {Control.CheckForIllegalCrossThreadCalls = false;} private void btnSend_Click (object sender, EventArgs e) {string str = txtMsg.Text Byte [] buffer = Encoding.UTF8.GetBytes (str); string ip = cboUsers.SelectedItem.ToString (); Dicket [IP] .send (buffer); / / socketSend.Send (buffer); txtMsg.Text = "";} private void btnSendUser_Click (object sender, EventArgs e) {string json = JsonConvert.SerializeObject (UserList ()) Byte [] buffer = Encoding.UTF8.GetBytes (json); socketSend.Send (buffer);} private List UserList () {List userList = new List (); User user = null; string sql = "select * from user_table"; SqlCommand cmd = SqlUtils.ConnectSql (sql); SqlDataReader sdr = cmd.ExecuteReader () While (sdr.Read ()) {user = new User (sdr.GetInt32 (0), sdr.GetString (1), sdr.GetString (2), sdr.GetInt32 (3)); userList.Add (user);} return userList;} client

Namespace TestClient {public partial class ClientForm: Form {Socket socketSend; public ClientForm () {InitializeComponent ();} private void btnStart_Click (object sender, EventArgs e) {try {/ / create socket socketSend = new Socket (AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp) responsible for communication IPAddress ip = IPAddress.Parse (txtServer.Text); IPEndPoint point = new IPEndPoint (ip,Convert.ToInt32 (txtPort.Text)); socketSend.Connect (point); ShowMsg ("connected successfully"); Thread th = new Thread (Recive); th.IsBackground = true; th.Start () } catch {} void Recive () {while (true) {/ / after the client connection is successful, the server should accept the message byte [] buffer = new byte [1024 * 1024 * 2] from the client. / / actual received valid bytes int r = socketSend.Receive (buffer); if (r = 0) {break;} string str = Encoding.UTF8.GetString (buffer, 0, r); ShowMsg (socketSend.RemoteEndPoint + ":" + str) }} void ShowMsg (string str) {txtLog.AppendText (str + "\ r\ n");} private void Form1_Load (object sender, EventArgs e) {Control.CheckForIllegalCrossThreadCalls = false;} private void btnSend_Click (object sender, EventArgs e) {string str = txtMsg.Text.Trim () Byte [] buffer = Encoding.UTF8.GetBytes (str); socketSend.Send (buffer); txtMsg.Text = "";}

Effect.

Send json data

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