MyBankgon功能

.帐户类 User

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   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 > )
              {
                  if (money <= _balance)
                  {
                      _balance -= money;
                      return _balance;
                  }
                  else
                  {
                      return -;
                  }

              }
              else
              {
                  return -;
              }
          }
          #endregion

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

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

     }
 }
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.银行类 Bank

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   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[];
          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[] = new User();
              _userGroup[].Account = "";
              _userGroup[].Name = "王丽丽";
              _userGroup[].Password = "";
              _userGroup[].IdentityNum = "";
              _userGroup[].Balance = 1000.1111;

              _userGroup[] = new User();
              _userGroup[].Account = "";
              _userGroup[].Name = "张颖颖";
              _userGroup[].Password = "";
              _userGroup[].IdentityNum = "";
              _userGroup[].Balance = ;

              _userGroup[] = new User();
              _userGroup[].Account = "";
              _userGroup[].Name = "刘华";
              _userGroup[].Password = "";
              _userGroup[].IdentityNum = "";
              _userGroup[].Balance = ;
          }
          #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 "":
                          CreateAccount();
                          continue;
                      case "":
                          Deposit();
                          continue;
                      case "":
                          WithDraw();
                          continue;
                      case "":
                          InputTransferData();
                          continue;
                      case "":
                          ShowBalance();
                          continue;
                      case "":
                          ModifyPwd();
                          continue;
                      case "":
                          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 = "";
             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 == )
             {
                 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 == -)
             {
                 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 = ;                //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) > )
             {
                 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 = , tbalance = ;

             // 执行转帐操作
             int iRet = Transfer(fromAccount, fromPwd, toAccount, money, ref fbalance, ref tbalance);
             if (iRet == )
             {
                 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 == -)
             {
                 Console.WriteLine("转出帐户的帐号或密码输入错误！");
             }
             else if (iRet == -)
             {
                 Console.WriteLine("转入帐号不正确！");
             }
             else if (iRet == -)
             {
                 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 -;
             }
             //检查转入帐号
             User userTo = CheckUserByAccount(tAccount);
             if (userTo == null)     //转入帐号不正确
             {
                 return -;
             }

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

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

             tBalance = userTo.Balance;

             return ;

         }
         #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
     }

 }
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.最关键的也是最后的了，Program类， 关于系统运行

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  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();
         }
     }
 }