BlogEngine.Core.Providers.XmlRoleProvider.AddUsersToRoles C# (CSharp) Method

        public override void AddUsersToRoles(string[] usernames, string[] roleNames)
        {
            ReadRoleDataStore();

            var currentRoles = new List<string>(this.GetAllRoles());
            if (usernames.Length != 0 && roleNames.Length != 0)
            {
                foreach (var rolename in roleNames.Where(rolename => !currentRoles.Contains(rolename) && !rolename.Equals(BlogConfig.AnonymousRole, StringComparison.OrdinalIgnoreCase)))
                {
                    this.roles[Blog.CurrentInstance.Id].Add(new Role(rolename, new List<string>(usernames)));
                }

                foreach (var role in this.roles[Blog.CurrentInstance.Id])
                {
                    var role1 = role;
                    foreach (var s in from name in roleNames
                                      where role1.Name.Equals(name, StringComparison.OrdinalIgnoreCase)
                                      from s in usernames
                                      where !role1.Users.Contains(s)
                                      select s)
                    {
                        role.Users.Add(s);
                    }
                }
            }

            this.Save();
        }