MyBank（自助银行）

今天我来给大家说说说C#这东西的用处吧。

就拿MyBank系统来讲解吧，望大家好好看将会得到不少的收获哦。

那么这个MyBank系统我们应该怎样来写呢？请看看下面的详细解答。

首先先看一些部分功能的效果图：

想要实现以上的功能以及页面我们改怎么操作呢？

关键时候到了，看清楚了哟：

1.帐户类 User

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

namespace MyBank
{
    /// <summary>
    /// 帐户类
    /// </summary>
    public class User
    {
        #region 成员变量
        /// <summary>
        /// 帐户姓名
        /// </summary>
        private string _name;

        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        /// <summary>
        /// 密码
        /// </summary>
        private string _password;

        public string Password
        {
            get { return _password; }
            set { _password = value; }
        }

        /// <summary>
        /// 身份证号
        /// </summary>
        private string _identityNum;

        public string IdentityNum
        {
            get { return _identityNum; }
            set { _identityNum = value; }
        }

        /// <summary>
        /// 帐户余额
        /// </summary>
        private double _balance;

        public double Balance
        {
            get { return _balance; }
            set { _balance = value; }
        }

        /// <summary>
        /// 帐号
        /// </summary>
        private string _account;

        public string Account
        {
            get { return _account; }
            set { _account = value; }
        }
        #endregion

        #region 取款
        /// <summary>
        /// 取款操作
        /// </summary>
        /// <param name="money">要取的金额</param>
        /// <returns>返回余额，输入有误返回-1</returns>
        public double MinusMoney(double money)
        {
            if (money > 0)
            {
                if (money <= _balance)
                {
                    _balance -= money;
                    return _balance;
                }
                else
                {
                    return -1;
                }

            }
            else
            {
                return -1;
            }
        }
        #endregion

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

                _balance += money;
                return _balance;
            }
            else
            {
                return -1;
            }       
        }
        #endregion

    }
}

2.银行类 Bank

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

namespace MyBank
{
    public class Bank
    {
        #region 成员变量的定义
        User user = new User();  //实例化User对象并赋值
        User[] _userGroup = new User[3];
        const string MESSAGE = "操作成功！";
        #endregion

        #region 初始化三个帐户
        /// <summary>
        /// 初始化三个帐户
        /// </summary>
        public void Initial()
        {
            _userGroup[0] = new User();
            _userGroup[0].Account = "179708064356";
            _userGroup[0].Name = "王丽丽";
            _userGroup[0].Password = "1234";
            _userGroup[0].IdentityNum = "210050619890808185";
            _userGroup[0].Balance = 1000.1111;

            _userGroup[1] = new User();
            _userGroup[1].Account = "179708064359";
            _userGroup[1].Name = "张颖颖";
            _userGroup[1].Password = "4321";
            _userGroup[1].IdentityNum = "510010619891231127";
            _userGroup[1].Balance = 2000;

            _userGroup[2] = new User();
            _userGroup[2].Account = "179708064368";
            _userGroup[2].Name = "刘华";
            _userGroup[2].Password = "4567";
            _userGroup[2].IdentityNum = "410207198904051271";
            _userGroup[2].Balance = 8000;
        }
        #endregion

        #region 显示所有帐户信息
        /// <summary>
        /// 显示所有帐户的帐号、姓名、密码、身份证号、帐户余额
        /// </summary>
        public void ShowAllUser()
        {
            foreach (User userItem in _userGroup)
            {
                Console.WriteLine("帐户姓名:" + userItem.Name + " 帐号：" + userItem.Account + " 存款余额：" + userItem.Balance + " 密码：" + userItem.Password + " 身份证号：" + userItem.IdentityNum);
            }
        }
        #endregion

        #region 显示菜单
        /// <summary>
        /// 显示菜单
        /// </summary>
        public void ShowCustomMenu()
        {
            string option = "";
            do
            {
                Console.WriteLine();
                Console.WriteLine("==================欢迎使用自动银行服务==================");
                Console.WriteLine("1:开户 2:存款 3:取款 4:转帐 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":
                        Deposit();
                        continue;
                    case "3":
                        WithDraw();
                        continue;
                    case "4":
                        InputTransferData();
                        continue;
                    case "5":
                        ShowBalance();
                        continue;
                    case "6":
                        ModifyPwd();
                        continue;
                    case "0":
                        break;      //结束switch
                    default:
                        Console.WriteLine("输入无效！");
                        continue;
                }

                break;              //结束do-while循环
            } while (true);
        }
        #endregion

        #region 开户
        /// <summary>
        /// 开户
        /// </summary>
        public void CreateAccount()
        {
            //接受输入的数据
            Console.WriteLine("请输入帐户名");
            user.Name = Console.ReadLine();
            user.Account = "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.IdentityNum = Console.ReadLine();
            Console.WriteLine("请输入帐户存款金额");
            user.Balance = double.Parse(Console.ReadLine());

            Console.WriteLine("帐户：{0}，帐户名：{1}，存款金额：{2}创建成功!", user.Account, user.Name, user.Balance);
            //Console.ReadLine();
        }
        #endregion

         #region 取款
        /// <summary>
        /// 取款
        /// </summary>
        public void WithDraw()
        {
            string account = "";             //帐号
            string pwd;                      //密码

            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;
            }


            //接收帐户密码，并验证
            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);
            }
        }
        #endregion
   

        #region 存款
        /// <summary>
        /// 存款
        /// </summary>
        public void Deposit()
        {
            string account = "";               //帐号
            double money = 0;                //存款金额

            Console.WriteLine("请输入帐号:");
            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("您输入的帐号不存在!");
            }

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

        }
        #endregion

        #region 判断帐户是否存在
        /// <summary>
        /// 通过帐号判断帐户是否存在
        /// </summary>
        /// <param name="account">帐号</param>
        /// <returns>存在返回user对象，不存在返回null</returns>
        private User CheckUserByAccount(string account)
        {
            foreach (User user in _userGroup)
            {
                if (user.Account == account)
                {
                    return user;
                }
            }
            return null;
        }
  
        /// <summary>
        /// 根据帐号和密码判定帐户是否存在
        /// </summary>
        /// <param name="account">帐号</param>
        /// <param name="pwd">密码</param>
        /// <returns>User & null</returns>
        private User CheckUser(string account,string pwd)
        {
            foreach (User user in _userGroup)
            {
                if (user.Account == account && user.Password ==pwd)
                {
                    return user;
                }
            }
            return null;
        }
        #endregion

        #region 转帐
        /// <summary>
        /// 转帐输入输出信息
        /// </summary>
        public void InputTransferData()
        {
            Console.WriteLine("请输入转出帐号：");
            string fromAccount = Console.ReadLine();
            Console.WriteLine("请输入转出帐户密码：");
            string fromPwd = Console.ReadLine();
            Console.WriteLine("请输入转入帐号：");
            string toAccount = Console.ReadLine();
            Console.WriteLine("请输入转帐金额：");
            double money = double.Parse(Console.ReadLine());
            double fbalance = 0, tbalance = 0;

            // 执行转帐操作
            int iRet = Transfer(fromAccount, fromPwd, toAccount, money, ref fbalance, ref tbalance);
            if (iRet == 1)
            {
                Console.WriteLine("转帐成功，转出帐号{0}的余额为：{1}，转入帐号{2}的余额为：{3}", fromAccount, fbalance, toAccount, tbalance);
            }
            else if (iRet == -1)
            {
                Console.WriteLine("转出帐户的帐号或密码输入错误！");
            }
            else if (iRet == -2)
            {
                Console.WriteLine("转入帐号不正确！");
            }
            else if (iRet == -3)
            {
                Console.WriteLine("转帐操作失败！");
            }

        }

        /// <summary>
        /// 执行转帐操作
        /// </summary>
        /// <param name="fAccount">当前帐号</param>
        /// <param name="fPwd">帐号密码</param>
        /// <param name="tAccount">转帐帐号</param>
        /// <param name="money">转帐金额</param>
        /// <param name="fBalance">当前帐号余额</param>
        /// <returns>-1：帐号或密码输入错误；1：转帐成功；0：转帐帐号不存在</returns>
        private int Transfer(string fAccount, string fPwd, string tAccount, double money, ref double fBalance, ref double tBalance)
        {
            //检查转出帐号和密码
            User userfrom = CheckUser(fAccount, fPwd);
            if (userfrom == null)   //转出帐户和密码不正确
            {
                return -1;
            }
            //检查转入帐号
            User userTo = CheckUserByAccount(tAccount);
            if (userTo == null)     //转入帐号不正确
            {
                return -2;
            }

            //取款
            if (userfrom.MinusMoney(money) == -1)   //转帐操作失败
            {
                return -3;
            }
            //取得余额
            fBalance = userfrom.Balance;

            //存款
            if (userTo.SaveMoney(money) == -1)     //转帐操作失败
            {
                return -3;
            }

            tBalance = userTo.Balance;

            return 1;

        }
        #endregion
   

        #region 显示帐户余额
        /// <summary>
        /// 显示帐户余额
        /// </summary>
        public void ShowBalance()
        {
            string accountName = "";    //当前帐号
            string password = "";       //当前帐户密码
            Console.WriteLine("请输入帐号");
            accountName = Console.ReadLine();
            Console.WriteLine("请输入密码");
            password = Console.ReadLine();
            User user = CheckUser(accountName, password);
            if (user == null)
            {
                Console.WriteLine("当前帐号不存在");
            }
            else
            {
                Console.WriteLine("帐户的余额是:" + user.Balance.ToString ("0.00"));
            }
        }
        #endregion

        #region 修改密码
        public void ModifyPwd()
        {
            string accountName = "";    //当前帐号
            string password = "";       //当前帐户密码
            Console.WriteLine("请输入帐号");
            accountName = Console.ReadLine();
            Console.WriteLine("请输入原密码");
            password = Console.ReadLine();
            
            string newPwd1, newPwd2;
            Console.WriteLine("请输入新密码");
            newPwd1 = Console.ReadLine();
            Console.WriteLine("请再次输入新密码");
            newPwd2 = Console.ReadLine();

            if(CheckPwd(accountName, password, newPwd1, newPwd2)==true)
                Console.WriteLine("帐户密码修改成功！");
            else
                Console.WriteLine("帐户密码修改失败！");

        }

        public bool CheckPwd(string accountName, string password, string newPwd1, string newPwd2)
        {
            User user = CheckUser(accountName, password);
            if (user == null)
            {
                Console.WriteLine("当前帐号不存在");
                return false;
            }

            if (newPwd1 != newPwd2)
            {
                Console.WriteLine("两只输入的帐户密码不一致！");
                return false;
            }
            else
            {
                user.Password = newPwd1;
                return true;
            }            
        }
        #endregion
    }

}

3.最关键的也是最后的了，Program类， 关于系统运行

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

namespace MyBank
{
    class Program
    {
        static void Main(string[] args)
        {
            Bank myBank = new Bank();

            //开户
            //myBank.CreateAccount();

            //初始化数据
            myBank.Initial();

            //显示所有帐户
            myBank.ShowAllUser();

            //显示菜单
            myBank.ShowCustomMenu();

            //取款
            //myBank.WithDraw();
        }
    }
}

好了，以上就是MyBank银行管理系统了哟