将用户的 ICollection 列表添加到 C# 中的现有角色列表

Question

我有 User 和 Role 类，每个类都有 List 定义。现在我想将用户列表添加到特定角色，换句话说，我想将用户引用列表放入 ICollection 角色中。

用户

 public class User
{
    public int UserID { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public  bool ActiveStatus { get; set; }

     public List<User> Users = new List<User>();

  public List<User> BuildUserRepository()
    {
        Users.Add(new User { UserID = 01, Name = "Khurram", Address = "London", ActiveStatus = true });
        Users.Add(new User { UserID = 02, Name = "Sana", Address = "London", ActiveStatus = true });
        Users.Add(new User { UserID = 03, Name = "Richard", Address = "London", ActiveStatus = false });
        Users.Add(new User { UserID = 04, Name = "Tracy", Address = "London", ActiveStatus = true });
        Users.Add(new User { UserID = 05, Name = "Laura", Address = "Manchester", ActiveStatus = true });
        Users.Add(new User { UserID = 06, Name = "James", Address = "London", ActiveStatus = false });

        return Users;
    }
}

角色

public class Role
{
    public int RoleID { get; set; }
    public string RoleTitle { get; set; }
    public ICollection<User> UsersInRole { get; set; }

    public List<Role> Roles = new List<Role>();

    public void BuildRoleRepository()
    {
        Roles.Add(new Role { RoleID = 01, RoleTitle = "Admin" });
        Roles.Add(new Role { RoleID = 02, RoleTitle = "Management" });
        Roles.Add(new Role { RoleID = 03, RoleTitle = "User" });
    }
 }

现在我想将 UserID 01 和 02 的两个用户添加到 Role ICollection where RoleID = 01，我该怎么做

Answer 1

无需对解决方案的设计进行一些重大更改，您可以通过以下代码 sn-p 来完成它。但请记住，hard coding 类中的实际/测试数据通常会进一步引入许多限制，并且通常被认为是反模式。使用外部数据存储（文件或数据库）和Repository Pattern 作为持久层可能会更好。希望对您有所帮助！

Role.Roles.First(x => x.RoleID == 01)
    .UsersInRole.AddRange(
        User.Users.Where(x => x.UserID == 01 || x.UserID == 02));

public class User
{
    public int UserID { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
    public bool ActiveStatus { get; set; }

    public static List<User> Users = new List<User>
    {
        new User {UserID = 01, Name = "Khurram", Address = "London", ActiveStatus = true},
        new User {UserID = 02, Name = "Sana", Address = "London", ActiveStatus = true},
        new User {UserID = 03, Name = "Richard", Address = "London", ActiveStatus = false},
        new User {UserID = 04, Name = "Tracy", Address = "London", ActiveStatus = true},
        new User {UserID = 05, Name = "Laura", Address = "Manchester", ActiveStatus = true},
        new User {UserID = 06, Name = "James", Address = "London", ActiveStatus = false}
    };
}

public class Role
{
    public int RoleID { get; set; }
    public string RoleTitle { get; set; }
    public List<User> UsersInRole { get; set; }

    public static List<Role> Roles = new List<Role>
    {
        new Role {RoleID = 01, RoleTitle = "Admin"},
        new Role {RoleID = 02, RoleTitle = "Management"},
        new Role {RoleID = 03, RoleTitle = "User"}
    };
}