removed devexpress and refactoring

UserService.DatabaseLayer/DataModels/Node.cs

@@ -1,4 +1,4 @@
-#nullable enable
+using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
 
@@ -11,7 +11,6 @@ namespace UserService.DatabaseLayer.DataModels
 
     public class SecurityGroup : Member
     {
-
     }
 
     public class User : Member
@@ -23,8 +22,6 @@ namespace UserService.DatabaseLayer.DataModels
         public string FullName => $"{FirstName} {LastName}";
 
         public IEnumerable<UserMember> MemberOf { get; set; } = new List<UserMember>();
-
-        public User Clone() => (User)MemberwiseClone();
     }
 
     public class UserMember
@@ -45,7 +42,7 @@ namespace UserService.DatabaseLayer.DataModels
         public ICollection<UserMember> Members { get; set; } = new List<UserMember>();
     }
 
-    public abstract class Node
+    public abstract class Node : ICloneable
     {
         public int Id { get; set; }
         [Required] public string CommonName { get; set; } = null!;
@@ -58,5 +55,8 @@ namespace UserService.DatabaseLayer.DataModels
         {
             return $"[{GetType().Name}] {Id:D5} {CommonName}";
         }
+
+        /// <inheritdoc />
+        public virtual object Clone() => MemberwiseClone();
     }
 }