TCP Small Instant Chat message program, C #-based program, server-side code

namespacesyncchatserver{classUser { PublicTcpClient client{Get;Private Set;}  PublicBinaryReader br{Get;Private Set;}  PublicBinaryWriter bw{Get;Private Set;}  Public stringUserName {Get;Set; }  PublicUser (TcpClient client) { This. Client =client; NetworkStream NetworkStream=client.            GetStream (); BR=NewBinaryReader (NetworkStream); Bw=NewBinaryWriter (NetworkStream); }         Public voidClose () {br.            Close (); Bw.            Close (); Client.        Close (); }}}//Declares a customer's class user

Using system;using system.collections.generic;using system.windows.forms;//added namespace reference using System.net;using system.net.sockets;using system.threading;namespace syncchatserver{public partial class Mainform:form {//        /<summary> Save all users connected </summary> private list<user> userlist = new list<user> ();        <summary> native IP address used by </summary> IPAddress localaddress;        <summary> Listening port </summary> Private Const int port = 51888;        Private TcpListener MyListener;        <summary> whether to exit all receive threads normally </summary> bool Isnormalexit = false;            Public MainForm () {InitializeComponent ();            Listboxstatus.horizontalscrollbar = true;            ipaddress[] Addrip = dns.gethostaddresses (Dns.gethostname ());            localaddress = addrip[0];        buttonstop.enabled = false; }///<summary> Start listening button's Click event </summary> private void buttonStart_click (object sender, EventArgs e) {mylistener = new TcpListener (localaddress, Port);            Mylistener.start (); Call a static method of string to specify the format of the output Additemtolistbox (string.            Format ("Start monitoring client connection at {0}:{1}", localaddress, Port));            Create a thread to listen for client connection requests Thread MyThread = new Thread (listenclientconnect);            Mythread.start ();            buttonstart.enabled = false;        Buttonstop.enabled = true; }///<summary> receive client connection </summary> private void Listenclientconnect () {Tcpclien            T newclient = null; while (true) {try {//In the server, the TcpClient object must be accepttcpclient ();                Method Get newclient = Mylistener.accepttcpclient (); } catch {//When you click Stop listening or exit this form accepttcpclient () will produce an exception//                Therefore, this exception can be used to exit the loop break; }                Each time a client connection is received, a corresponding thread is created to loop over the information sent by the client user user = new user (newclient);                Thread threadreceive = new Thread (receivedata);                Threadreceive.start (user);                Userlist.add (user); Additemtolistbox (String.                Format ("[{0}] enter", NewClient.Client.RemoteEndPoint)); Additemtolistbox (String.            Format ("Current number of connected users: {0}", Userlist.count)); }}///<summary>//Processing client data Received///</summary>//<param name= "UserState" &            gt; client information </param> private void Receivedata (object userState) {User user = (user) userState;            TcpClient client = user.client;                while (Isnormalexit = = False) {string receivestring = null; try {///reads the string from the network stream, this method automatically determines the string length prefix and reads the string receivestring = user based on the length prefix. Br.                ReadString (); } catch               {if (Isnormalexit = = False) {Additemtolistbo X (String. Format ("with [{0}] lost contact, terminated receiving this user information", client.                        Client.remoteendpoint));                    Removeuser (user);                } break; } additemtolistbox (String.                Format ("from [{0}]:{1}", User.client.Client.RemoteEndPoint, receivestring));                string[] splitstring = Receivestring.split (', '); Switch (splitstring[0]) {case "Login": User.username = Splitstri                        NG[1];                        Sendtoallclient (user, receivestring);                    Break                        Case "Logout": sendtoallclient (user, receivestring);                        Removeuser (user);                    Return Case "Talk": string talkstring = Receivestring.substring (splitstring[0]. Length+ splitstring[1].                        Length + 2); Additemtolistbox (String.                        Format ("{0} to {1} said: {2}", User.username, splitstring[1], talkstring));                        Sendtoclient (User, "talk," + User.username + "," + talkstring); foreach (User target in userlist) {if (Target.username = = Splitstring[1 ] && User.username! = splitstring[1]) {sendtoclient (tar                                Get, "talk," + User.username + "," + talkstring);                            Break                    }} break;                        Default:additemtolistbox ("What do you mean:" + receivestring);                Break }}}///<summary>//Send message to User///</summary>//&LT;PA Ram name= "User" > Specify which user to send </param>            <param name= "message" > Information content </param> private void sendtoclient (user user, String message) {                try {//writes a string to the network stream, this method automatically appends the string length prefix user.bw.Write (message);                User.bw.Flush (); Additemtolistbox (String.            Format ("Send to [{0}]: {1}", User.username, message)); } catch {Additemtolistbox (string.            Format ("Sending information to [{0}] failed", user.username));        }}///<summary> send information to all customers </summary>//<param name= "User" > Specify which user to send </param>        <param name= "message" > Information content </param> private void sendtoallclient (user user, String message) {string command = message. Split (', ') [0].                ToLower ();///////////////////////////////////////////////////////////////if (Command = = "Login") { for (int i = 0; i < userlist. Count; i++) {sendtoclient (userlist[i], message),//If the login information is sent to each user this information if (U Serlist[i].username! = user.username)//If it is the login information, it will also be sent to the user who will be logged on the user's name {SENDTOCL                    Ient (User, "login," + userlist[i].username);                }}} else if (command== "logout")//If it is logged out, it is sent to each of the remaining user log-out information {                     for (int i = 0; i < Userlist.count; i++) {if (userlist[i].username! = user.username)                    {sendtoclient (userlist[i], message); }}}}///<summary> Remove users </summary>//<param name= "user" &G            t; Specify the user to delete </param> private void Removeuser (user user) {userlist.remove (user); User.            Close (); Additemtolistbox (String.        Format ("Current number of connected users: {0}", Userlist.count)); }        Private delegate void Additemtolistboxdelegate (String str); <summary> Append status information to the ListBox </summary>//<param name= "str" > Information to append </param> private void Additemtolistbox (String str) {if (listboxstatus.invokerequired) {Addite                Mtolistboxdelegate d = additemtolistbox;            Listboxstatus.invoke (d, str);                } else {listBoxStatus.Items.Add (str);                Listboxstatus.selectedindex = listboxstatus.items.count-1;            Listboxstatus.clearselected (); }}///<summary> "Stop Listening" button for click event </summary> private void ButtonStop_Click (object sender,            EventArgs e) {Additemtolistbox ("Start to stop the service and let the user exit in turn!");            Isnormalexit = true;            for (int i = userlist.count-1; I >= 0; i--) {Removeuser (userlist[i]); }//By stopping the monitoring let MyliStener.            AcceptTcpClient () generates an abnormal exit listener thread mylistener.stop ();            Buttonstart.enabled = true;        buttonstop.enabled = false; }///<summary> event triggered when the window is closed </summary> private void Mainform_formclosing (object sender, FormClosing                EventArgs e) {if (MyListener! = null) {//Raises the Buttonstop click event            Buttonstop.performclick (); }        }    }}

　　

TCP Small Instant Chat message program, C #-based program, server-side code