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Encapsulate an array into a class

2022-07-27 21:52:00 【51CTO】

Elements in a class , It can also be int And other data types

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Day07
{
    class User
    {
	private string loginId;
        private string password;
        public string LoginId
        {
            set { loginId = value; }
            get { return loginId; }
        }
        public string Password
        {
            set { password = value; }
            get { return password; }
        }
        public User() { }
        public User(string loginId,string password) {
            this.loginId = loginId;
            this.password = password;
        }
        public void PrintUser() {
            Console.WriteLine(" account number ：{0}, password ：{1}",loginId,password);
        }
    }


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Encapsulate an array into a class , So that we can use

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Day07
{
    /// <summary>
    ///  User collection class 
    /// </summary>
    class UserList
    {
        // Field 
        private User[] user;
        private int i = 0;
        // attribute 
        public int Count
        {
            get { return i; }
        }
        // Constructors 
        public UserList() : this(8)
        {

        }
        public UserList(int capcity)
        {
            user = new User[capcity];
        }
        // Method 
        public void Add(User user1)
        {
            Expansion();
            user[i++] = user1;
        }
        private void Expansion()
        {
            if (i >= user.Length)
            {
                User[] userNew = new User[user.Length * 2];
                for (int j = 0; j < user.Length; j++)
                    userNew[j] = user[j];
                user = userNew;
            }
        }
        public User GetElement(int index)
        {
            return user[index];
        }
    }
}


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Class in the main method

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Day07
{
    class Program
    {
        static void Main(string[] args)
        {            UserList userList = new UserList(3);
            userList.Add(new User());
            userList.Add(new User());
            userList.Add(new User());
            userList.Add(new User());
            for (int i = 0;i<userList.Count ;i++ ) {
                User user = userList.GetElement(i);
                user.PrintUser();
            }
        }
    }
}

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The final debugging results are shown in the figure ：

Encapsulate an array into a class _ Wrapper class
Add ： Usually we use generic sets 、 Dictionary sets store elements instead of arrays , Instead of writing a class to hold elements