Update ArgumentsManager.cs

Updated AddArguments method
Updated Argument class :
    - Changed _names get property into a _names readonly variable
    - Removed unused constructors
    - Removed Contains method
    - Adding Equals, GetHashCode, == operator and != operator methods

Author: ZPyrolink

ProgramArgumentsManager/ArgumentsManager.cs

@@ -1,5 +1,4 @@
 using System;
-using System.CodeDom;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -24,8 +23,8 @@ public ArgumentsManager(string name, string version)
 
         public void AddArguments(string format, string description)
         {
-            format = format.Trim();
-            
+            format = format.Replace(" ", string.Empty);
+
             if (!format.Contains("-") && !format.Contains("--"))
                 throw new ArgumentException("Le format '" + format + " n'est pas comaptible en tant que paramètre !",
                     nameof(format));
@@ -42,16 +41,40 @@ public void AddArguments(string format, string description)
 
         private class Argument
         {
-            private string[] _names { get; }
+            private readonly string[] _names;
 
-            public Argument(string name) : this(new []{name}) { }
-            public Argument(string name1, string name2) : this(new[] {name1, name2}) { }
             public Argument(string[] names)
             {
                 _names = names;
             }
 
-            public bool Contain(string name) => _names.Contains(name);
+            private bool Equals(Argument other) => other._names.Any(s => _names.Contains(s));
+
+            public override bool Equals(object obj)
+            {
+                if (obj is null)
+                    return false;
+                if (ReferenceEquals(this, obj))
+                    return true;
+
+                return obj.GetType() == GetType() && Equals((Argument) obj);
+            }
+
+            public override int GetHashCode()
+            {
+                // Same HashCode for each instance to force the use of the Equals method (for the Dictionnary key)
+                return 0;
+            }
+
+            public static bool operator ==(Argument left, Argument right)
+            {
+                return Equals(left, right);
+            }
+
+            public static bool operator !=(Argument left, Argument right)
+            {
+                return !Equals(left, right);
+            }
         }
     }
 }