From be99c8d3f92e80527b3b230761c64d9dabf4aec2 Mon Sep 17 00:00:00 2001
From: Sem van der Hoeven <semmer99@gmail.com>
Date: Wed, 21 Oct 2020 22:18:37 +0200
Subject: [PATCH] [FIX] fixed equals operators

---
 SharedClientServer/User.cs | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/SharedClientServer/User.cs b/SharedClientServer/User.cs
index 4a1a36c..8d45dc2 100644
--- a/SharedClientServer/User.cs
+++ b/SharedClientServer/User.cs
@@ -1,11 +1,12 @@
 using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Text;
 
 namespace SharedClientServer
 {
-    class User
+    class User : IEquatable<User>
     {
         private string _username;
         private int _score;
@@ -29,12 +30,20 @@ namespace SharedClientServer
 
         public static bool operator ==(User u1, User u2)
         {
-            return u1.Username == u2.Username;
+            if (object.ReferenceEquals(u1, null))
+            {
+                return object.ReferenceEquals(u2, null);
+            }
+            return u1.Equals(u2 as object);
         }
 
         public static bool operator !=(User u1, User u2)
         {
-            return u1.Username != u2.Username;
+            if (object.ReferenceEquals(u1, null))
+            {
+                return object.ReferenceEquals(u2, null);
+            }
+            return u1.Equals(u2 as object);
         }
 
         public override bool Equals(object obj)
@@ -45,11 +54,15 @@ namespace SharedClientServer
             }
             else
             {
-                User other = obj as User;
-                return other.Username == this.Username;
+                return this.Equals(obj as User);
+                
             }
         }
-            
+
+        public bool Equals([AllowNull] User other)
+        {
+            return other.Username == this.Username;
+        }
 
         public string Username
         {