在C#中使用递归获取嵌套用户

本文关键字：获取 嵌套 用户 递归 | 更新日期: 2023-09-27 18:22:11

我有一个User类，它有两个属性UserID和ParentUserID。这意味着用户具有自我参照关系。这是类的定义：

public class User
{
    public User() { }
    public User(string userid, string parentuserid)
    {
        this.UserID = userid;
        this.ParentUserID = parentuserid;
    }
    public string UserID;
    public string ParentUserID;
}

我需要实现一个方法，该方法应该根据UserID返回完整层次结构中存在的用户列表。我相信使用递归代码会简单得多，但我无法独自完成它。

public List<User> SubUsersHierarchy(List<User> users, string userid, int currentIndex)
    {
        List<User> subUsers = new List<User>();
        if (currentIndex >= users.Count)
        { }
        else
        {
        }
        return users;
    }

示例客户端如下：

List<User> users = new List<User>();
User user1 = new User("User2","User1");
User user2 = new User("User3", "User1");
User user3 = new User("User4", "User3");
User user4 = new User("User5", "User2");
users.Add(user1);
users.Add(user2);
users.Add(user3);
users.Add(user4);
List<User> subUsers = SubUsersHierarchy(users, "User1", 0);

上述调用的输出应为：

User2, User3, User4, User5

在C#中使用递归获取嵌套用户

我能够使用以下代码实现我的目标。我想这并不太复杂。

static List<User> users = null;
    static void Main(string[] args)
    {
        users = new List<User>();
        User user1 = new User("User2","User1");
        User user2 = new User("User3", "User1");
        User user3 = new User("User4", "User3");
        User user4 = new User("User5", "User2");
        users.Add(user1);
        users.Add(user2);
        users.Add(user3);
        users.Add(user4);
        List<User> subUsersList = new List<User>();
        SubUsersHierarchy("User1", subUsersList, 1, 10);
        foreach (User user in subUsersList)
        {
            Console.WriteLine(user.UserID);
        }
    }
    public static void SubUsersHierarchy(string userid, List<User> subUsersList, int currentLevel, int maxLevel)
    {
        if (currentLevel > maxLevel)
            return;
        List<User> subUsers = GetSubUsers(userid);
        if (subUsers.Count == 0)
            return;
        int index = 0;
        for (index = 0; index < subUsers.Count; index++)
        {
            User user = subUsers[index];
            subUsersList.Add(user);
            SubUsersHierarchy(user.UserID, subUsersList, currentLevel + 1, maxLevel);
        }
    }
    public static List<User> GetSubUsers(string userid)
    {
        List<User> subusers = new List<User>();
        foreach (User user in users)
        {
            if (user.ParentUserID == userid)
                subusers.Add(user);
        }
        return subusers;
    }
}
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