Null check instead of initilizing empty work

CLI/ClientExample.cs

@@ -12,7 +12,11 @@ class clientExample {
     }
     
     void onClientConnected(mUDPClient user) {
-        Console.WriteLine("User connected with username: " + user.UserName);
+        Console.WriteLine("User connected to server with username: " + user.UserName);
+    }
+
+    void onClientJoined(mUDPClient user) {
+        Console.WriteLine("User is now in range of you and UDP connections started with user : " + user.UserName);
     }
 
     void onReceive(mUDPClient? user, dynamic data) {
@@ -29,8 +33,12 @@ class clientExample {
         }
     }
 
+    void onClientLeft(mUDPClient user) {
+        Console.WriteLine("User is no longer in range of you and UDP connections ended with user : " + user.UserName);
+    }
+
     void onClientDisconnected(mUDPClient user) {
-        Console.WriteLine("User disconnected with username: " + user.UserName);
+        Console.WriteLine("User disconnected from server with username: " + user.UserName);
     }
 
     void onServerDisconnected() {
@@ -42,7 +50,9 @@ class clientExample {
         if (clientObject == null) return;
         clientObject.onServerConnected += onServerConnected;
         clientObject.onUserConnected += onClientConnected;
+        clientObject.onUserJoined += onClientJoined;
         clientObject.onDataReceived += onReceive;
+        clientObject.onUserLeft += onClientLeft;
         clientObject.onUserDisconnected += onClientDisconnected;
         clientObject.onServerDisconnected += onServerDisconnected;
     }

MistoxServer/Client/MistoxClient.cs

@@ -36,14 +36,6 @@ namespace Mistox.Client {
             UserName = userName;
             ConnectionKey = connectionKey;
 
-            onServerConnected += () => {};
-            onUserConnected += (_) => {};
-            onUserJoined += (_) => {};
-            onDataReceived += (_,_) => {};
-            onUserLeft += (_) => {};
-            onUserDisconnected += (_) => {};
-            onServerDisconnected += () => {};
-
             // Create and connect to server on TCP
             Console.WriteLine( "The client is initilized and trying to connect to the server at ip : " + Server.Address );
             try {
@@ -95,13 +87,17 @@ namespace Mistox.Client {
                 if (!clientConnections.ContainsKey(remoteHost)) {
                     mUDPClient newConnection = new mUDPClient(this, remoteHost);
                     clientConnections[remoteHost] = newConnection;
+                    InvokeOnUserJoined(newConnection);
                 }
             }
 
             // Remove users that left
             foreach (IPEndPoint key in clientConnections.Keys) {
                 if (!activeIps.Contains(key.Address)) {
-                    clientConnections.TryRemove(key, out _);
+                    mUDPClient? user;
+                    clientConnections.TryRemove(key, out user);
+                    if (user == null) return;
+                    InvokeOnUserLeft(user);
                 }
             }
             
@@ -143,7 +139,7 @@ namespace Mistox.Client {
 /////////////////////////////
 
         // When (self) connects to the server
-        public event Action onServerConnected;
+        public event Action? onServerConnected;
         public void InvokeOnServerConnected(){
             Alive = true;
             Task.Run(async () => {
@@ -155,19 +151,19 @@ namespace Mistox.Client {
         }
 
         // When any user connects to the server (self) hasn't seen yet
-        public event Action<string> onUserJoined;
-        public void InvokeOnUserJoined(string UserName){
-            onUserJoined?.Invoke(UserName);
+        public event Action<mUDPClient>? onUserJoined;
+        public void InvokeOnUserJoined(mUDPClient User){
+            onUserJoined?.Invoke(User);
         }
 
         // When user is within range of (self) and network rendering starts
-        public event Action<mUDPClient> onUserConnected;
-        public void InvokeOnUserConnected(mUDPClient ConnectedUser){
-            onUserConnected?.Invoke(ConnectedUser);
+        public event Action<mUDPClient>? onUserConnected;
+        public void InvokeOnUserConnected(mUDPClient User){
+            onUserConnected?.Invoke(User);
         }
 
         // When generic data is received
-        public event Action<mUDPClient?, dynamic> onDataReceived;
+        public event Action<mUDPClient?, dynamic>? onDataReceived;
         public void InvokeOnReceived(dynamic DataPacket, mUDPClient? remote = null){
             switch (DataPacket as object)  {
                 case HeartbeatPacket packet:
@@ -188,19 +184,19 @@ namespace Mistox.Client {
         }
 
         // When user is no longer in range of (self) and network rendering stops
-        public event Action<mUDPClient> onUserDisconnected;
-        public void InvokeOnUserDisconnected(mUDPClient DisconnectedUser){
-            onUserDisconnected?.Invoke(DisconnectedUser);
+        public event Action<mUDPClient>? onUserDisconnected;
+        public void InvokeOnUserDisconnected(mUDPClient User){
+            onUserDisconnected?.Invoke(User);
         }
 
         // When any user disconnects from the server that isn't (self)
-        public event Action<string> onUserLeft;
-        public void InvokeOnUserLeft(string UserName){
-            onUserLeft?.Invoke(UserName);
+        public event Action<mUDPClient>? onUserLeft;
+        public void InvokeOnUserLeft(mUDPClient User){
+            onUserLeft?.Invoke(User);
         }
 
         // When (self) disconnects to the server
-        public event Action onServerDisconnected;
+        public event Action? onServerDisconnected;
         public void InvokeOnServerDisconnected(){
             Alive = false;
             onServerDisconnected?.Invoke();

MistoxServer/Server/MistoxServer.cs

@@ -22,9 +22,6 @@ namespace Mistox.Server {
         public MistoxServer(IPEndPoint ListenerAddress, string serverName) {
             ServerName = serverName;
             Listener = new ServerListener(ListenerAddress, this);
-            onUserConnected += (_) => {};
-            onDataReceived += (_, _) => {};
-            onUserDisconnected += (_) => {};
             Console.WriteLine( "The Server is initilized and waiting for clients to connect at port : " + ListenerAddress.Port );
         }
 
@@ -75,13 +72,13 @@ namespace Mistox.Server {
 // Events
 /////////////////////////////
 
-        public event Action<ServerConnection> onUserConnected;
+        public event Action<ServerConnection>? onUserConnected;
         public void InvokeUserConnected( ServerConnection user ){
             Connections[user.UserName] = user;
             onUserConnected?.Invoke( user );
         }
 
-        public event Action<ServerConnection, object> onDataReceived;
+        public event Action<ServerConnection, object>? onDataReceived;
         public void InvokeDataReceived( ServerConnection user, dynamic data ){
             switch (data) {
                 case UserAuthPacket packet when !user.IsAuthenticated:
@@ -104,7 +101,7 @@ namespace Mistox.Server {
             }
         }
 
-        public event Action<ServerConnection> onUserDisconnected;
+        public event Action<ServerConnection>? onUserDisconnected;
         public void InvokeUserDisconnected( ServerConnection user ){
             Connections.Remove(user.UserName, out _);
             onUserDisconnected?.Invoke( user );