C# Mybank

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

namespace ConsoleApplication2
{
    class User
    {

        private string name;
        public string _name //姓名
        {
            get { return name; }
            set { name = value; }
        }
        private string password;
        public string _password //密码
        {
            get { return password; }
            set { password = value; }
        }

        private double yue;
        public double yu//余额
        {
            get { return yue; }
            set { yue = value; }
        }
        private string hao1;
        public String hao//账号
        {
            get { return hao1; }
            set { hao1 = value; }
        }
        private string sh1;
        public string sh//身份证号
        {
            get { return sh1; }
            set { sh1 = value; }
        }
        /// <summary>
        /// 取款操作
        /// </summary>
        public double MinusMoney(double money)
        {
            if (money > 0)
            {
                if (money <= yu)
                {
                    yu -= money;
                    return yu;
                }
                else
                {
                    return -1;
                }

            }
            else
            {
                return -1;
            }
        }

        /// <summary>
        /// 存款
        /// </summary>
        /// <param name="money">存款金额</param>
        public double SaveMoney(double money)
        {
            if (money > 0)
            {

                yu += money;
                return yu;
            }
            else
            {
                return -1;
            }
        }
    }
}

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

namespace ConsoleApplication2
{
    class Bank
    {
        User user = new User();
        User[] _userGroup = new User[3];
        const string MESSAGE = "操作成功！";
        public void zong()
        {
            _userGroup[0] = new User();
            _userGroup[0].hao = "12";
            _userGroup[0]._name = "王丽丽";
            _userGroup[0]._password = "1234";
            _userGroup[0].sh = "210050619890808185";
            _userGroup[0].yu = 1000;

            _userGroup[1] = new User();
            _userGroup[1].hao = "13";
            _userGroup[1]._name = "张颖颖";
            _userGroup[1]._password = "4321";
            _userGroup[1].sh = "510010619891231127";
            _userGroup[1].yu = 2000;

            _userGroup[2] = new User();
            _userGroup[2].hao = "179708064368";
            _userGroup[2]._name = "刘华";
            _userGroup[2]._password = "4567";
            _userGroup[2].sh = "410207198904051271";
            _userGroup[2].yu = 8000;
        }
        public void show1()
        {
            foreach (User userItem in _userGroup)
            {
                Console.WriteLine("帐户姓名:" + userItem._name + " 帐号：" + userItem.hao + " 存款余额：" + userItem.yu);
                //Console.WriteLine("帐户姓名:" + userItem._name);
            }
        }
        public void show2()
        {
            string option = "";
            do
            {
                Console.WriteLine("==================欢迎使用自动银行服务==================");
                Console.WriteLine("1:开户 2:存款 3:取款 4:转账 5:查询余额 6:修改密码 0:退出");
                Console.WriteLine("========================================================");
                option = Console.ReadLine();
                switch (option)
                {
                    case "1":
                        CreateAccount();
                        continue;
                    case "2":
                        cunkuan();
                        continue;
                    case "3":
                        qukuan();
                        continue;
                    case "4":
                        Indklhyeibn();
                        continue;
                    case "5":
                        continue;
                    case "6":
                        continue;
                    case "0":
                        break;
                    default:
                        Console.WriteLine("输入无效！");
                        continue;
                }

                break;
            } while (true);
        }
        //开户
        public void CreateAccount()
        {

            Console.WriteLine("请输入帐户姓名");
            user._name = Console.ReadLine();
            user.hao = "179708064356";
            Console.WriteLine("请输入帐户密码");
            user._password = Console.ReadLine();
            Console.WriteLine("请输入帐户身份证号");
            user.sh = Console.ReadLine();
            Console.WriteLine("请输入帐户存款金额");
            user.yu = double.Parse(Console.ReadLine());

            Console.WriteLine("帐号：{0}，帐户姓名：{1}，存款金额：{2} {3}", user.hao, user._name, user.yu, MESSAGE);

        }
        //取款
        public void qukuan()
        {
            string account = "";

            string pwd;

            Console.WriteLine("请输入帐号:");
            account = Console.ReadLine();
            if (account.Length == 0)
            {
                Console.WriteLine("输入的帐号不正确！");
                return;
            }
            // 新增：在3个帐户中查找指定的帐户
            User user = CheckUserByAccount(account);
            if (user == null)
            {
                Console.WriteLine("输入的帐号不正确！");
                return;
            }



            Console.WriteLine("请输入帐户密码:");
            pwd = Console.ReadLine();

            if (user._password != pwd)
            {
                Console.WriteLine("密码有误!");
                return;
            }

            Console.WriteLine("请输入取款金额");
            double money = double.Parse(Console.ReadLine());
            double result = user.MinusMoney(money);
            if (result == -1)
            {
                Console.WriteLine("取款失败");
            }
            else
            {
                Console.WriteLine("取款成功!当前余额:" + result);
            }
        }
        //存款
        public void cunkuan()
        {
            string account = "";
            double money = 0;

            Console.WriteLine("请输入账号:");
            account = Console.ReadLine();
            Console.WriteLine("请输入存入金额:");
            money = double.Parse(Console.ReadLine());


            User user;
            if ((user = CheckUserByAccount(account)) == null)
            {
                Console.WriteLine("您输入的账号不存在!");
            }

            if (user.SaveMoney(money) > 0)
            {
                Console.WriteLine(MESSAGE + "当前余额：" + user.yu);
            }
            else
            {
                Console.WriteLine("存款失败！");
            }

        }



       
        //
         public void Indklhyeibn()
        {
            Console.WriteLine("请输入转出账号:");
            string fromaccount = Console.ReadLine();
            Console.WriteLine("请输入转出账号密码:");
            string frompwd = Console.ReadLine();
            Console.WriteLine("请输入转出账号:");
            string toaccount = Console.ReadLine();
            Console.WriteLine("请输入转账金额:");
            double money = double.Parse(Console.ReadLine());
            double fbalance = 0, tbalance = 0;
            //执行转账操作 参数分别为转出账号,密码   转入账号 ,密码 初始化俩个值
            int iRet = Transfer(fromaccount, frompwd, toaccount, money, ref fbalance, ref tbalance);
            if (iRet==1)
            {
                Console.WriteLine("转账成功，转出账号{0}余额为：{1}，转入账号{2}余额为：{3}", fromaccount, fbalance, toaccount, tbalance);
            }
            else if (iRet == -1)
            {
                Console.WriteLine("转出账户的账号或密码输入错误！");

            }
            else if (iRet == -2)
            {
                Console.WriteLine("转入账号错误！");


            }
            else if (iRet == -3)
            {
                Console.WriteLine("转账失败！");

            }
        }
        public User checkUser(string account, string pwd)
        {
            foreach (User s in _userGroup)
            {
                if (account.Equals(s.hao) && pwd.Equals(s._password))
                {
                    return s;
                }
            }
            return null;
        }
        //用户是否存在
        private User CheckUserByAccount(string account)
        {
            foreach (User user in _userGroup)
            {
                if (user.hao == account)
                {
                    return user;
                }
            }
            return null;
        }
        public User checkUserbyaccount(string toaccount)
        {
            foreach (User s in _userGroup)
            {
                if (toaccount.Equals(s.hao))
                {
                    return s;
                }
            }
            return null;
        }
        //访问修饰符 返回值 方法名 (参数类型  参数列表)

        public int Transfer(string fromaccount, string frompwd, string toaccount, double money, ref double fbalance, ref double tbalance)
        { 
            //检查转出账号和密码]

            User userfrom = checkUser(fromaccount, frompwd);
            if (userfrom == null)
            {//转出账号或密码不正确
                return -1;
            }
            //检查转入账号
             User userto = checkUserbyaccount(toaccount);
            if (userto == null)
            {//转入账号不正确
                return -2;
            }
            //取款
            if (userfrom.MinusMoney(money) == 1)
            {
                return -3;

            }
            fbalance = userfrom.yu;
            if (userto.SaveMoney( money) == 1)
            {
                return -3;
            }
            tbalance = userto.yu;
            return 1;
        }
      
      
        
            
    }
}

调用:

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
             
            Bank u = new Bank();
            u.zong();

           
            u.show1();
            u.show2();
            Console.ReadLine();
           

               
        }
    }
}