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I have done many search in this forum and StackOverflow but I wanted to know if I am doing thing properly or is there a better way to manage permission in C#. In my database, I have entities that are assigned either to a User or a Group of users, giving them rights to do things on the entity based on their role. My User class is something like this :

public class User {     private Role role;     public Role Role; } 

and my group class is this :

public class Group {     private List<Tuple<User, GroupRole>> members;     private IReadOnlyList<Tuple<User, GroupRole>> Members => this.members; } 

I have a PermissionManager class in my Application that handle this side of the application :

public class PermissionManager {     private List<User> users;     public IReadOnlyList<User> Users => this.users;      private List<Group> groups;     public IReadOnlyList<Group> Groups => this.groups;      public User AuthenticatedUser { private set; get; }      public User Authenticate(String login, String password)     {         this.AuthenticatedUser = null;         foreach (User user in this.Users)         {             if (user.CompareCredentials(login, Hash(password)))             {                 this.AuthenticatedUser = user;                 break;             }         }         return this.AuthenticatedUser;     }      public void Demand(Role requiredRole, Group group = null, GroupRole? requiredGroupRole = null)     {         if (AuthenticatedUser == null)             throw new PermissionDeniedException("Action needs authentication.");         if ((group == null) && (AuthenticatedUser.Role < requiredRole))             throw new PermissionDeniedException("Insufficient rights.");         else if (group != null)         {             var foundUsers = from member in @group.Members                          where member.Item1 == AuthenticatedUser                          select member;             if (foundUsers.Count() == 0)             {                 throw new PermissionDeniedException("Authenticated user is not a member of the group.");             }             else             {                 if ((requiredGroupRole != null) &&                     (foundUsers.First().Item2 < requiredGroupRole))                 {                     throw new PermissionDeniedException("Insufficient group rights.");                 }             }         }     } } 

And when I need to ask for permission, I use it like this :

public class User {     public readonly Application Application;      private String name;     public String Name     {         set         {             Application.PermissionManager.Demand(Role.ADMINISTRATOR);             this.name = value;         }         get         {             Application.PermissionManager.Demand(Role.VIEWER);             return this.name;         }     } } 

I feel like I am not doing something right, so I came here to ask your opinions about this. Thank you.

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