银行系统心得

最近用的无线上网,网速很慢,而且要改注册表伪装才能上,网页上的一些功能会有点问题,没办法,只能尽量写点儿重要的了:(

这个系统写了一半,核心的是写完了,还剩几个客户层的.可惜我的ATM模拟系统总是有点出错,一直检查不出在哪里,可能我太菜吧:)

系统采用的是客户端, 业务逻辑层(采用COM+组件技术), 和数据库层的三层结构. 实际中的银行系统至少要5层机构. 这也是比较规范项目的一种通用分层方法, 做这个当中我学会了如何使用类库, 如何注册组件, 如何有效的进行分层, 真正的逻辑层到底是什么含义等等. 印象深刻,收获彼多.

1.类库的使用.
类库实际上是一个包含各种类,接口,值类型组成的库.它本身就是一个项目,通过编辑和注册后供同解决方案中的其他程序集调用.所以,他也主要用来实现逻辑层.
比如我的系统,就是在类库的命名空间里定义了一个接口,然后再定义一个类来实现这个接口.
去除接口函数和类中相应实现的定义,我把主要的贴出来:

using  System;
using  System.EnterpriseServices;     // COM+组件服务
using  System.Data;
using  System.Data.SqlClient;
using  System.Collections;     // 链表
using  System.Windows.Forms;

// 配置Bank组件的安全性,并且说明组件的激活方式是服务器激活
[assembly:ApplicationAccessControl(
AccessChecksLevel  =  AccessChecksLevelOption.ApplicationComponent,
Authentication  =  AuthenticationOption.Call,
ImpersonationLevel  =  ImpersonationLevelOption.Delegate
)]

[assembly:ApplicationActivation(ActivationOption.Server)]

namespace  Bank
{
     // 定义所需的所有操作
    
     // BankOperation 接口定义
     public   interface  BankOperation
    {
.. .. ..
    }

     // 支持事务
    [Transaction(TransactionOption.Supported)]
    
     // 使用对象池,最小共享容量是10,最大共享容量是50,创建时限是30秒
    [ObjectPooling( true ,  10 ,  50 , CreationTimeout  =   30000 )]

     // 使用及时激活JITA
    [JustInTimeActivation]

     // 定义构造字符串
    [ConstructionEnabled(
         Default  =   " data source=localhost;initial catalog=bank;user id=sa;password=; "
    )]

     // 定义安全角色
    [SecurityRole( " bank " ,  true )]
    [ComponentAccessControl]

     // Bank类的定义
     public   class  Bank : ServicedComponent, BankOperation
    {
.. .. ..
    }

}

2.要使类库能够正常使用,必需要配置组件的安全性,这样组件注册时才不会有警告.
上面的AccessChecksLevel, Authentication, ImpersonationLevel 都是定义各个方面的值.

3.也许初学者看着上面的说明会提出这个接口定义的没有必要?
实际上是大大有必要的.我们要养成对复杂的程序定义接口的习惯,先在分析报告里把所有要实现的功能都列举出来,然后定义接口,再用类实现.这样就不会遗漏,也利于长时间的开发周期.

4.上面使用了Transaction等等的一系列支持.
做这个系统时,我最大的感受就是太缺乏其他的系统和网络方面的知识.比如上面的对象池,JITA,安全角色等等,我都不太懂,做这个的时候逼迫自己去学.
这种感觉很好.这是一种编程到一定阶段自己迫切需要去吸收某种知识的状态.就象一个VB程序员要去学VC,不应该是听别人说VC怎么怎么好而去学,而是明显的感觉到VB已经不能满足自己的编程要求了而去学.这才是正确的道路.
而我以前,只是自己"想去学什么",而不是"需要去学什么".我觉得,这算是真正进入电脑殿堂的一个入门吧:)

5.要使用组件,必须先编译该组件,并为该组件生成一个强名(Strong Name).然后在类库的说明文件AssemblyInfo.cs里面引用.
强名实际上就是一个用于签名的密钥,用来给程序集签名.这是使用COM+组件的必备条件.同时,所有使用COM+组件的程序集必须引用System.EnterpriseServices,这样才能使用COM+服务.所有的COM+中的类也必须继承ServicedComponent ,它是所有COM+类的基类.

6.三层结构的真正含义.
我以前理解的比较不正确,以为应用层可以不放置代码.这个是错误的.所谓应用层和逻辑层,主要是我们要把核心的逻辑,需要经常改动的逻辑等等放入逻辑层,应用层里的代码核心部分必须调用逻辑层的方法来实现.如果应用层里有一个重要实现是用自己的代码实现的,那么这个方法可能要放到逻辑层中.

7.应用层里的细微实现代码多种多样,但是在.NET这种真正面向对象的语言里,我们要尽量减少全局变量,多用方法返回对象赋予局部变量来实现.

这里贴出逻辑层核心文件:

using  System;
using  System.EnterpriseServices;     // COM+组件服务
using  System.Data;
using  System.Data.SqlClient;
using  System.Collections;     // 链表
using  System.Windows.Forms;

// 配置Bank组件的安全性,并且说明组件的激活方式是服务器激活
[assembly:ApplicationAccessControl(
AccessChecksLevel  =  AccessChecksLevelOption.ApplicationComponent,
Authentication  =  AuthenticationOption.Call,
ImpersonationLevel  =  ImpersonationLevelOption.Delegate
)]

[assembly:ApplicationActivation(ActivationOption.Server)]

namespace  Bank
{
     // 定义所需的所有操作
    
     // BankOperation 接口定义
     public   interface  BankOperation
    {
         bool  CreateAccount( string  accountNo,  string  customerID,  string  password,  decimal  balance);     // 生成新的账号

         bool  CreateCard( string  cardNo,  string  accountNo,  string  password);     // 生成新的卡号

         bool  CreateCustomer( string  customerID,  string  name,  string  gender, DateTime birthday,  string  address,  string  phone);     // 生成新的客户

         void  DeleteAccount( string  accountNo);     // 删除账号

         void  DeleteCard( string  cardNo);     // 删除卡号

         void  DeleteCustomer( string  customerID);     // 删除客户

         bool  DepositByAccountNo( string  accountNo,  decimal  amount);     // 利用账号存款

         bool  DepositByCardNo( string  cardNo,  decimal  amount);     // 利用卡号存款

        ArrayList GetAllAccounts();     // 获取所有的账号

        ArrayList GetAllAccountsByCustomerID( string  customerID);     // 获取指定客户的所有账号

        ArrayList GetAllCards();     // 获取所有的卡号

        ArrayList GetAllCardsByAccountNo( string  accountNo);     // 获取指定账号的所有卡号

        ArrayList GetAllCustomers();     // 获取所有的客户

         decimal  QueryByAccountNo( string  accountNo);     // 利用账号查询余额

         decimal  QueryByCardNo( string  cardNo);     // 利用卡号查询余额

         bool  TransferByAccountNo( string  fromAccountNo,  string  toAccountNo,  decimal  amount);     // 利用账号进行转账

         bool  TransferByCardNo( string  fromCardNo,  string  toCardNo,  decimal  amount);     // 利用卡号进行转账

         bool  UpdateAccountPassword( string  accountNo,  string  pwd);     // 更改账号口令

         bool  UpdateCardPassword( string  cardNo,  string  pwd);     // 更改卡号口令

         bool  VerifyAccountNo( string  accountNo,  string  pwd);     // 验证账号

         bool  VerifyCardNo( string  cardNo,  string  pwd);     // 验证卡号

         bool  WithdrawByAccountNo( string  accountNo,  decimal  amount);     // 利用账号取款

         bool  WithdrawByCardNo( string  cardNo,  decimal  amount);     // 利用卡号进行取款
    }

     // 支持事务
    [Transaction(TransactionOption.Supported)]
    
     // 使用对象池,最小共享容量是10,最大共享容量是50,创建时限是30秒
    [ObjectPooling( true ,  10 ,  50 , CreationTimeout  =   30000 )]

     // 使用及时激活JITA
    [JustInTimeActivation]

     // 定义构造字符串
    [ConstructionEnabled(
         Default  =   " data source=localhost;initial catalog=bank;user id=sa;password=; "
    )]

     // 定义安全角色
    [SecurityRole( " bank " ,  true )]
    [ComponentAccessControl]

     // Bank类的定义
     public   class  Bank : ServicedComponent, BankOperation
    {
         private   string  connString;

         public  Bank()
        {
        }

         // 重置 Construct() 方法
         protected   override   void  Construct( string  s)
        {
             base .Construct (s);
            connString  =  s;
        }

         // GetConnection() 方法用配置好的连接字符串从数据库获取数据库连接
         private  SqlConnection GetConnection()
        {
            SqlConnection conn  =   new  SqlConnection();
            conn.ConnectionString  =  connString;
             return  conn;
        }

         // 运行查询返回DataReader
         private  SqlDataReader GetDataReader( string  cmdString, SqlConnection conn)
        {
            SqlCommand comm  =   new  SqlCommand(cmdString, conn);
            SqlDataReader dr  =  comm.ExecuteReader();
             return  dr;
        }

         // 只执行语句,无返回
         private   void  Update( string  cmdString, SqlConnection conn)
        {
            SqlCommand comm  =   new  SqlCommand(cmdString, conn);
            comm.ExecuteNonQuery();
        }

         // 根据卡号查询账号
         private   string  QueryAccountNo( string  cardNo)
        {
             string  result;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             string  cmdString  =   " select AccountNo from Card where CardNo=' "   +  cardNo  +   " ' " ;
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
             if  (dr.Read())
            {
                result  =  dr.GetString( 0 );
            }
             else
            {
                result  =   " error " ;
            }
            dr.Close();
            conn.Close();
             return  result;
        }

         // 判断账号是否存在
         private   bool  AccountNoExists( string  accountNo)
        {
             bool  result;
             string  cmdString  =   " select AccountNo from Account where AccountNo=' "   +  accountNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
             if  (dr.Read())
            {
                result  =   true ;
            }
             else
            {
                result  =   false ;
            }
            dr.Close();
            conn.Close();
             return  result;
        }

         #region  BankOperation 成员

         public   bool  CreateAccount( string  accountNo,  string  customerID,  string  password,  decimal  balance)
        {
            ArrayList list  =   this .GetAllAccounts();
             if  (list.Contains(accountNo))
            {
                 return   false ;
            }
             string  cmdString  =   " insert into Account values(' "   +  accountNo  +   " ',' "   +  customerID  +   " ',' "   +  password  +   " ', "   +  balance  +   " ,' "   +  DateTime.Today  +   " ') " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
             return   true ;
        }

         public   bool  CreateCard( string  cardNo,  string  accountNo,  string  password)
        {
            ArrayList list  =   this .GetAllCards();
             if  (list.Contains(cardNo))
            {
                 return   false ;
            }
             string  cmdString  =   " insert into Card values(' "   +  cardNo  +   " ',' "   +  accountNo  +   " ',' "   +  password  +   " ') " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
             return   true ;
        }

         public   bool  CreateCustomer( string  customerID,  string  name,  string  gender, DateTime birthday,  string  address,  string  phone)
        {
            ArrayList list  =   this .GetAllCustomers();
             if  (list.Contains(customerID))
            {
                 return   false ;
            }
             string  cmdString  =   " insert into Customer values(' "   +  customerID  +   " ', " ;
             if  (name  !=   null )
            {
                cmdString  +=   " ' "   +  name  +   " ', " ;
            }
             else
            {
                cmdString  +=   " null, " ;
            }
             if  (gender  !=   null )
            {
                cmdString  +=   " ' "   +  gender  +   " ', " ;
            }
             else
            {
                cmdString  +=   " null, " ;
            }
             if  (birthday  ==  DateTime.MinValue)
            {
                cmdString  +=   " null, " ;
            }
             else
            {
                cmdString  +=   " ' "   +  birthday  +   " ', " ;
            }
             if  (address  !=   null )
            {
                cmdString  +=   " ' "   +  address  +   " ', " ;
            }
             else
            {
                cmdString  +=   " null, " ;
            }
             if  (phone  !=   null )
            {
                cmdString  +=   " ' "   +  phone  +   " ' " ;
            }
             else
            {
                cmdString  +=   " null " ;
            }
            cmdString  +=   " ) " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
             return   true ;
        }

         public   void  DeleteAccount( string  accountNo)
        {
             string  cmdString  =   " delete from Account where AccountNo=' "   +  accountNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
        }

         public   void  DeleteCard( string  cardNo)
        {
             string  cmdString  =   " delete from Card where CardNo=' "   +  cardNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
        }

         public   void  DeleteCustomer( string  customerID)
        {
             string  cmdString  =   " delete from Customer where CustomerID=' "   +  customerID  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
        }

         public   bool  DepositByAccountNo( string  accountNo,  decimal  amount)
        {
             if  ( ! this .AccountNoExists(accountNo))
            {
                 return   false ;
            }
             string  cmdString  =   " update Account set balance=balance+ "   +  amount  +   "  where AccountNo=' "   +  accountNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
             return   true ;
        }

         public   bool  DepositByCardNo( string  cardNo,  decimal  amount)
        {
             string  accountNo  =   this .QueryAccountNo(cardNo);
             if  (accountNo  ==   " error " )
            {
                 return   false ;
            }
             return   this .DepositByAccountNo(accountNo, amount);
        }

         public  ArrayList GetAllCustomers()
        {
            ArrayList arrayCustomers  =   new  ArrayList();
            SqlConnection conn  =   this .GetConnection();
             string  cmdString  =   " select CustomerID from Customer " ;
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
             while  (dr.Read())
            {
                 string  customerID  =  dr.GetString( 0 );
                arrayCustomers.Add(customerID);
            }
            dr.Close();
            conn.Close();
             return  arrayCustomers;
        }

         public  ArrayList GetAllAccounts()
        {
             string  cmdString  =   " select AccountNo from Account " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
            ArrayList list  =   new  ArrayList();
             while  (dr.Read())
            {
                list.Add(dr.GetString( 0 ));
            }
            dr.Close();
            conn.Close();
             return  list;
        }

         public  ArrayList GetAllAccountsByCustomerID( string  customerID)
        {
             string  cmdString  =   " select AccountNo from Account where CustomerID=' "   +  customerID  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
            ArrayList list  =   new  ArrayList();
             while  (dr.Read())
            {
                list.Add(dr.GetString( 0 ));
            }
            dr.Close();
            conn.Close();
             return  list;
        }

         public  ArrayList GetAllCards()
        {
             string  cmdString  =   " select CardNo from Card " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
            ArrayList list  =   new  ArrayList();
             while  (dr.Read())
            {
                list.Add(dr.GetString( 0 ));
            }
            dr.Close();
            conn.Close();
             return  list;
        }

         public  ArrayList GetAllCardsByAccountNo( string  accountNo)
        {
             string  cmdString  =   " select CardNo from Card where AccountNo=' "   +  accountNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
            ArrayList list  =   new  ArrayList();
             while  (dr.Read())
            {
                list.Add(dr.GetString( 0 ));
            }
            dr.Close();
            conn.Close();
             return  list;
        }

         public   decimal  QueryByAccountNo( string  accountNo)
        {
             string  cmdString  =   " select Balance from Account where AccountNo=' "   +  accountNo  +   " ' " ;
             decimal  balance  =   - 1 ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
             if  (dr.Read())
            {
                balance  =  dr.GetDecimal( 0 );
            }
             else
            {
                balance  =   - 1 ;
            }
            dr.Close();
            conn.Close();
             return  balance;
        }

         public   decimal  QueryByCardNo( string  cardNo)
        {
             decimal  balance  =   - 1 ;
             string  accountNo;
            accountNo  =   this .QueryAccountNo(cardNo);
             if  (accountNo  ==   " error " )
            {
                balance  =   - 1 ;
            }
             else
            {
                balance  =   this .QueryByAccountNo(accountNo);
            }
             return  balance;
        }

         public   bool  TransferByAccountNo( string  fromAccountNo,  string  toAccountNo,  decimal  amount)
        {
             bool  result;
             if  ( this .AccountNoExists(fromAccountNo)  &&   this .AccountNoExists(toAccountNo))
            {
                 string  cmdString  =   " select balance from Account where AccountNo=' "   +  fromAccountNo  +   " ' " ;
                SqlConnection conn  =   this .GetConnection();
                conn.Open();
                SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
                dr.Read();
                 decimal  balance  =  dr.GetDecimal( 0 );
                dr.Close();
                 if (balance  <  amount)
                {
                    result  =   false ;
                }
                 else
                {
                    cmdString  =   " update Account set balance=balance- "   +  amount  +   "  where AccountNo=' "   +  fromAccountNo  +   " ' " ;
                     this .Update(cmdString, conn);
                    cmdString  =   " update Account set balance=balance+ "   +  amount  +   "  where AccountNo=' "   +  toAccountNo  +   " ' " ;
                     this .Update(cmdString, conn);
                    result  =   true ;
                }
                conn.Close();
            }
             else
            {
                result  =   false ;
            }
             return  result;
        }

         public   bool  TransferByCardNo( string  fromCardNo,  string  toCardNo,  decimal  amount)
        {
             bool  result;
             string  fromAccountNo  =   this .QueryAccountNo(fromCardNo);
             string  toAccountNo  =   this .QueryAccountNo(toCardNo);
             if  (fromAccountNo  ==   " error "   ||  toAccountNo  ==   " error " )
            {
                result  =   false ;
            }
             else
            {
                result  =   this .TransferByAccountNo(fromAccountNo, toAccountNo, amount);
            }
             return  result;
        }

         public   bool  UpdateAccountPassword( string  accountNo,  string  pwd)
        {
             if  ( ! this .AccountNoExists(accountNo))
            {
                 return   false ;
            }
             string  cmdString  =   " update Account set Password=' "   +  pwd  +   " ' where AccountNo=' "   +  accountNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
             return   true ;
        }

         public   bool  UpdateCardPassword( string  cardNo,  string  pwd)
        {
             if  ( this .QueryAccountNo(cardNo)  ==   " error " )
            {
                 return   false ;
            }
             string  cmdString  =   " update Card set Password=' "   +  pwd  +   " ' where CardNo=' "   +  cardNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
             this .Update(cmdString, conn);
            conn.Close();
             return   true ;
        }

         public   bool  VerifyAccountNo( string  accountNo,  string  pwd)
        {
             bool  result;
             string  cmdString  =   " select AccountNo from Account where AccountNo=' "   +  accountNo  +   " ' and password=' "   +  pwd  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
             if  (dr.Read())
            {
                result  =   true ;
            }
             else
            {
                result  =   false ;
            }
            dr.Close();
            conn.Close();
             return  result;                
        }

         public   bool  VerifyCardNo( string  cardNo,  string  pwd)
        {
             bool  result;
             string  cmdString  =   " select CardNo from Card where CardNo=' "   +  cardNo  +   " ' and password=' "   +  pwd  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
             if  (dr.Read())
            {
                result  =   true ;
            }
             else
            {
                result  =   false ;
            }
            dr.Close();
            conn.Close();
             return  result;
        }

         public   bool  WithdrawByAccountNo( string  accountNo,  decimal  amount)
        {
             bool  result;
             string  cmdString  =   " select balance from Account where AccountNo=' "   +  accountNo  +   " ' " ;
            SqlConnection conn  =   this .GetConnection();
            conn.Open();
            SqlDataReader dr  =   this .GetDataReader(cmdString, conn);
            dr.Read();
             decimal  balance  =  dr.GetDecimal( 0 );
            dr.Close();
             if  (amount  >  balance)
            {
                result  =   false ;
            }
             else
            {
                cmdString  =   " update Account set balance=balance- "   +  amount  +   "  where AccountNo=' "   +  accountNo  +   " ' " ;
                 this .Update(cmdString, conn);
                result  =   true ;
            }
            conn.Close();
             return  result;
        }

         public   bool  WithdrawByCardNo( string  cardNo,  decimal  amount)
        {
             bool  result;
             string  accountNo  =   this .QueryAccountNo(cardNo);
             if  (accountNo  ==   " error " )
            {
                result  =   false ;
            }
             else
            {
                result  =   this .WithdrawByAccountNo(accountNo, amount);
            }
             return  result;
        }

         #endregion

    }

}

应用层一个比较高效的应用层:

using  System;
using  System.Drawing;
using  System.Collections;
using  System.ComponentModel;
using  System.Windows.Forms;
using  Bank;

namespace  ATM
{
     ///   <summary>
     ///  ATM 的摘要说明。
     ///   </summary>
     public   class  ATM : System.Windows.Forms.Form
    {
         private  System.Windows.Forms.Button btnQueryBalance;
         private  System.Windows.Forms.Button btnWithdraw;
         private  System.Windows.Forms.Button btnDeposit;
         private  System.Windows.Forms.Button btnTransfer;
         private  System.Windows.Forms.Button btnChangePassword;
         private  System.Windows.Forms.GroupBox groupBox1;
         private  System.Windows.Forms.Label label1;
         private  System.Windows.Forms.Label label2;
         private  System.Windows.Forms.TextBox txtCardNo;
         private  System.Windows.Forms.TextBox txtPassword;
         private  System.Windows.Forms.Button btnOkPassword;
         private  System.Windows.Forms.GroupBox groupBox2;
         private  System.Windows.Forms.Button btnOK;
         private  System.Windows.Forms.Button btnReInput;
         private  System.Windows.Forms.Button btnExit;
         private  System.Windows.Forms.TextBox txt;
         private  System.Windows.Forms.RichTextBox richTxt;
         private  System.Windows.Forms.Label label3;

         private   bool  isVerified;
         private   bool  isWithdraw;
         private   bool  isDeposit;
         private   bool  isTransfer;
         private   bool  isUpdatePassword;

         private   bool  isTransfering;
         // private string transferCardNo;
         // private decimal transferAmount;
         private  Bank.Bank bank;
         ///   <summary>
         ///  必需的设计器变量。
         ///   </summary>
         private  System.ComponentModel.Container components  =   null ;

         public  ATM()
        {
             //
             //  Windows 窗体设计器支持所必需的
             //
            InitializeComponent();
             this .isVerified  =   false ;
             this .isWithdraw  =   false ;
             this .isDeposit  =   false ;
             this .isTransfer  =   false ;
             this .isUpdatePassword  =   false ;
             this .isTransfering  =   false ;
             this .bank  =   new  Bank.Bank();
        }

         ///   <summary>
         ///  清理所有正在使用的资源。
         ///   </summary>
         protected   override   void  Dispose(  bool  disposing )
        {
             if ( disposing )
            {
                 if (components  !=   null )
                {
                    components.Dispose();
                }
            }
             base .Dispose( disposing );
        }

         static   void  Main()
        {
            Application.Run( new  ATM());
        }

         #region  Windows 窗体设计器生成的代码
         ///   <summary>
         ///  设计器支持所需的方法 - 不要使用代码编辑器修改
         ///  此方法的内容。
         ///   </summary>
         private   void  InitializeComponent()
        {
             this .btnQueryBalance  =   new  System.Windows.Forms.Button();
             this .btnWithdraw  =   new  System.Windows.Forms.Button();
             this .btnDeposit  =   new  System.Windows.Forms.Button();
             this .btnTransfer  =   new  System.Windows.Forms.Button();
             this .btnChangePassword  =   new  System.Windows.Forms.Button();
             this .groupBox1  =   new  System.Windows.Forms.GroupBox();
             this .label1  =   new  System.Windows.Forms.Label();
             this .label2  =   new  System.Windows.Forms.Label();
             this .txtCardNo  =   new  System.Windows.Forms.TextBox();
             this .txtPassword  =   new  System.Windows.Forms.TextBox();
             this .btnOkPassword  =   new  System.Windows.Forms.Button();
             this .groupBox2  =   new  System.Windows.Forms.GroupBox();
             this .btnOK  =   new  System.Windows.Forms.Button();
             this .btnReInput  =   new  System.Windows.Forms.Button();
             this .btnExit  =   new  System.Windows.Forms.Button();
             this .txt  =   new  System.Windows.Forms.TextBox();
             this .richTxt  =   new  System.Windows.Forms.RichTextBox();
             this .label3  =   new  System.Windows.Forms.Label();
             this .groupBox1.SuspendLayout();
             this .groupBox2.SuspendLayout();
             this .SuspendLayout();
             //  
             //  btnQueryBalance
             //  
             this .btnQueryBalance.Location  =   new  System.Drawing.Point( 24 ,  112 );
             this .btnQueryBalance.Name  =   " btnQueryBalance " ;
             this .btnQueryBalance.TabIndex  =   0 ;
             this .btnQueryBalance.Text  =   " 查询余额 " ;
             this .btnQueryBalance.Click  +=   new  System.EventHandler( this .btnQueryBalance_Click);
             //  
             //  btnWithdraw
             //  
             this .btnWithdraw.Location  =   new  System.Drawing.Point( 24 ,  160 );
             this .btnWithdraw.Name  =   " btnWithdraw " ;
             this .btnWithdraw.TabIndex  =   1 ;
             this .btnWithdraw.Text  =   " 取款 " ;
             this .btnWithdraw.Click  +=   new  System.EventHandler( this .btnWithdraw_Click);
             //  
             //  btnDeposit
             //  
             this .btnDeposit.Location  =   new  System.Drawing.Point( 24 ,  208 );
             this .btnDeposit.Name  =   " btnDeposit " ;
             this .btnDeposit.TabIndex  =   2 ;
             this .btnDeposit.Text  =   " 存款 " ;
             this .btnDeposit.Click  +=   new  System.EventHandler( this .btnDeposit_Click);
             //  
             //  btnTransfer
             //  
             this .btnTransfer.Location  =   new  System.Drawing.Point( 24 ,  256 );
             this .btnTransfer.Name  =   " btnTransfer " ;
             this .btnTransfer.TabIndex  =   3 ;
             this .btnTransfer.Text  =   " 转账 " ;
             this .btnTransfer.Click  +=   new  System.EventHandler( this .btnTransfer_Click);
             //  
             //  btnChangePassword
             //  
             this .btnChangePassword.Location  =   new  System.Drawing.Point( 24 ,  304 );
             this .btnChangePassword.Name  =   " btnChangePassword " ;
             this .btnChangePassword.TabIndex  =   4 ;
             this .btnChangePassword.Text  =   " 修改口令 " ;
             this .btnChangePassword.Click  +=   new  System.EventHandler( this .btnChangePassword_Click);
             //  
             //  groupBox1
             //  
             this .groupBox1.Controls.Add( this .btnOkPassword);
             this .groupBox1.Controls.Add( this .txtPassword);
             this .groupBox1.Controls.Add( this .txtCardNo);
             this .groupBox1.Controls.Add( this .label2);
             this .groupBox1.Controls.Add( this .label1);
             this .groupBox1.Location  =   new  System.Drawing.Point( 152 ,  16 );
             this .groupBox1.Name  =   " groupBox1 " ;
             this .groupBox1.Size  =   new  System.Drawing.Size( 408 ,  112 );
             this .groupBox1.TabIndex  =   5 ;
             this .groupBox1.TabStop  =   false ;
             this .groupBox1.Text  =   " 卡号信息 " ;
             //  
             //  label1
             //  
             this .label1.AutoSize  =   true ;
             this .label1.Location  =   new  System.Drawing.Point( 24 ,  32 );
             this .label1.Name  =   " label1 " ;
             this .label1.Size  =   new  System.Drawing.Size( 35 ,  17 );
             this .label1.TabIndex  =   0 ;
             this .label1.Text  =   " 卡号: " ;
             //  
             //  label2
             //  
             this .label2.AutoSize  =   true ;
             this .label2.Location  =   new  System.Drawing.Point( 24 ,  72 );
             this .label2.Name  =   " label2 " ;
             this .label2.Size  =   new  System.Drawing.Size( 35 ,  17 );
             this .label2.TabIndex  =   1 ;
             this .label2.Text  =   " 口令: " ;
             //  
             //  txtCardNo
             //  
             this .txtCardNo.Location  =   new  System.Drawing.Point( 72 ,  30 );
             this .txtCardNo.Name  =   " txtCardNo " ;
             this .txtCardNo.Size  =   new  System.Drawing.Size( 304 ,  21 );
             this .txtCardNo.TabIndex  =   2 ;
             this .txtCardNo.Text  =   "" ;
             //  
             //  txtPassword
             //  
             this .txtPassword.Location  =   new  System.Drawing.Point( 72 ,  70 );
             this .txtPassword.Name  =   " txtPassword " ;
             this .txtPassword.Size  =   new  System.Drawing.Size( 200 ,  21 );
             this .txtPassword.TabIndex  =   3 ;
             this .txtPassword.Text  =   "" ;
             //  
             //  btnOkPassword
             //  
             this .btnOkPassword.Location  =   new  System.Drawing.Point( 296 ,  72 );
             this .btnOkPassword.Name  =   " btnOkPassword " ;
             this .btnOkPassword.TabIndex  =   4 ;
             this .btnOkPassword.Text  =   " 确认口令 " ;
             this .btnOkPassword.Click  +=   new  System.EventHandler( this .btnOkPassword_Click);
             //  
             //  groupBox2
             //  
             this .groupBox2.Controls.Add( this .label3);
             this .groupBox2.Controls.Add( this .richTxt);
             this .groupBox2.Controls.Add( this .txt);
             this .groupBox2.Location  =   new  System.Drawing.Point( 152 ,  144 );
             this .groupBox2.Name  =   " groupBox2 " ;
             this .groupBox2.Size  =   new  System.Drawing.Size( 408 ,  216 );
             this .groupBox2.TabIndex  =   6 ;
             this .groupBox2.TabStop  =   false ;
             //  
             //  btnOK
             //  
             this .btnOK.Location  =   new  System.Drawing.Point( 584 ,  216 );
             this .btnOK.Name  =   " btnOK " ;
             this .btnOK.TabIndex  =   7 ;
             this .btnOK.Text  =   " 确认 " ;
             this .btnOK.Click  +=   new  System.EventHandler( this .btnOK_Click);
             //  
             //  btnReInput
             //  
             this .btnReInput.Location  =   new  System.Drawing.Point( 584 ,  256 );
             this .btnReInput.Name  =   " btnReInput " ;
             this .btnReInput.TabIndex  =   8 ;
             this .btnReInput.Text  =   " 重新输入 " ;
             this .btnReInput.Click  +=   new  System.EventHandler( this .btnReInput_Click);
             //  
             //  btnExit
             //  
             this .btnExit.Location  =   new  System.Drawing.Point( 584 ,  296 );
             this .btnExit.Name  =   " btnExit " ;
             this .btnExit.TabIndex  =   9 ;
             this .btnExit.Text  =   " 操作结束 " ;
             this .btnExit.Click  +=   new  System.EventHandler( this .btnExit_Click);
             //  
             //  txt
             //  
             this .txt.Location  =   new  System.Drawing.Point( 24 ,  56 );
             this .txt.Name  =   " txt " ;
             this .txt.ReadOnly  =   true ;
             this .txt.Size  =   new  System.Drawing.Size( 360 ,  21 );
             this .txt.TabIndex  =   0 ;
             this .txt.Text  =   "" ;
             this .txt.TextChanged  +=   new  System.EventHandler( this .txt_TextChanged);
             //  
             //  richTxt
             //  
             this .richTxt.Location  =   new  System.Drawing.Point( 8 ,  88 );
             this .richTxt.Name  =   " richTxt " ;
             this .richTxt.Size  =   new  System.Drawing.Size( 392 ,  120 );
             this .richTxt.TabIndex  =   1 ;
             this .richTxt.Text  =   "" ;
             //  
             //  label3
             //  
             this .label3.AutoSize  =   true ;
             this .label3.Location  =   new  System.Drawing.Point( 24 ,  24 );
             this .label3.Name  =   " label3 " ;
             this .label3.Size  =   new  System.Drawing.Size( 0 ,  17 );
             this .label3.TabIndex  =   2 ;
             //  
             //  ATM
             //  
             this .AutoScaleBaseSize  =   new  System.Drawing.Size( 6 ,  14 );
             this .ClientSize  =   new  System.Drawing.Size( 672 ,  381 );
             this .Controls.Add( this .btnExit);
             this .Controls.Add( this .btnReInput);
             this .Controls.Add( this .btnOK);
             this .Controls.Add( this .groupBox2);
             this .Controls.Add( this .groupBox1);
             this .Controls.Add( this .btnChangePassword);
             this .Controls.Add( this .btnTransfer);
             this .Controls.Add( this .btnDeposit);
             this .Controls.Add( this .btnWithdraw);
             this .Controls.Add( this .btnQueryBalance);
             this .Name  =   " ATM " ;
             this .Text  =   " ATM " ;
             this .Load  +=   new  System.EventHandler( this .ATM_Load);
             this .groupBox1.ResumeLayout( false );
             this .groupBox2.ResumeLayout( false );
             this .ResumeLayout( false );

        }
         #endregion

         private   void  ATM_Load( object  sender, System.EventArgs e)
        {
        
        }

         private   void  btnQueryBalance_Click( object  sender, System.EventArgs e)
        {
             if  ( ! this .isVerified)
            {
                 this .richTxt.AppendText( " 请先验证卡号和口令! " );
            }
             else
            {
                 decimal  balance;
                 string  cardNo  =   this .txtCardNo.Text;
                balance  =  bank.QueryByCardNo(cardNo);
                 this .richTxt.AppendText( " 你的余额是: "   +  balance.ToString()  +   " \r\n " );
            }
        }

         private   void  btnWithdraw_Click( object  sender, System.EventArgs e)
        {
             if  ( this .isVerified)
            {
                label3.Text  =   " 请输入取款金额: " ;
                 this .txt.ReadOnly  =   false ;

                 this .isWithdraw  =   true ;
                 this .isTransfer  =   false ;
                 this .isDeposit  =   false ;
                 this .isUpdatePassword  =   false ;
            }
             else
            {
                 this .richTxt.AppendText( " 请先验证卡号和口令! " );
                label3.Text  =   "" ;
                 this .txt.ReadOnly  =   true ;
            }
        }

         private   void  btnDeposit_Click( object  sender, System.EventArgs e)
        {
             if  (isVerified)
            {
                label3.Text  =   " 请输入存款金额: " ;
                 this .txt.ReadOnly  =   false ;

                 this .isWithdraw  =   false ;
                 this .isTransfer  =   false ;
                 this .isDeposit  =   true ;
                 this .isUpdatePassword  =   false ;
            }
             else
            {
                 this .richTxt.AppendText( " 请先验证卡号和口令: " );
                 this .label3.Text  =   "" ;
                 this .txt.ReadOnly  =   true ;
            }
        }

         private   void  btnTransfer_Click( object  sender, System.EventArgs e)
        {
             if  (isVerified)
            {
                label3.Text  =   " 请输入账号: " ;
                 this .txt.ReadOnly  =   false ;

                 this .isWithdraw  =   false ;
                 this .isTransfer  =   true ;
                 this .isDeposit  =   false ;
                 this .isUpdatePassword  =   false ;
            }
             else
            {
                 this .richTxt.AppendText( " 请先验证卡号和口令: " );
                 this .label3.Text  =   "" ;
                 this .txt.ReadOnly  =   true ;
            }
        }

         private   void  btnChangePassword_Click( object  sender, System.EventArgs e)
        {
             if  (isVerified)
            {
                label3.Text  =   " 请输入新的口令: " ;
                 this .txt.ReadOnly  =   false ;

                 this .isWithdraw  =   false ;
                 this .isTransfer  =   false ;
                 this .isDeposit  =   false ;
                 this .isUpdatePassword  =   true ;
            }
             else
            {
                 this .richTxt.AppendText( " 请先验证卡号和口令: " );
                 this .label3.Text  =   "" ;
                 this .txt.ReadOnly  =   true ;
            }
        }

         private   void  btnOK_Click( object  sender, System.EventArgs e)
        {
             if  ( this .isWithdraw)
            {
                 string  cardNo  =   this .txtCardNo.Text;
                 decimal  amount  =   decimal .Parse( this .txt.Text);
                 if  (bank.WithdrawByCardNo(cardNo, amount))
                {
                     this .richTxt.AppendText( " 取款操作成功!您所取金额是: "   +  amount.ToString()  +   " \r\n " );
                }
                 else
                {
                     this .richTxt.AppendText( " 取款操作失败!\r\n " );
                     this .richTxt.AppendText( " 您的存款余额可能不足!\r\n " );
                }
                 this .isWithdraw  =   false ;
            }

             if  ( this .isDeposit)
            {
                 string  cardNo  =   this .txtCardNo.Text;
                 decimal  amount  =   decimal .Parse( this .txt.Text);
                 if  (bank.DepositByCardNo(cardNo, amount))
                {
                     this .richTxt.AppendText( " 存款操作成功!您所存金额是: "   +  amount.ToString()  +   " \r\n " );
                }
                 else
                {
                     this .richTxt.AppendText( " 存款操作失败!\r\n " );
                }
                 this .isDeposit  =   false ;
            }

             if  ( this .isTransfer)
            {
                 if  ( this .isTransfering)
                {

                }
            }

             if  ( this .isUpdatePassword)
            {
                 string  cardNo  =   this .txt.Text;
                 string  password  =   this .txt.Text;
                 if  (bank.UpdateCardPassword(cardNo, password))
                {
                     this .richTxt.AppendText( " 口令修改成功!\r\n " );
                }
                 else
                {
                     this .richTxt.AppendText( " 口令修改失败!\r\n " );
                }
                 this .isUpdatePassword  =   false ;
            }

            
        }

         private   void  btnReInput_Click( object  sender, System.EventArgs e)
        {
             if  ( ! this .txt.ReadOnly)
            {
                 this .txt.Text  =   "" ;
                 this .richTxt.AppendText( " 请重新输入您的信息!\r\n " );
            }
        }

         private   void  btnExit_Click( object  sender, System.EventArgs e)
        {
             this .richTxt.AppendText( " 谢谢您的使用,欢迎下次光临!\r\n " );
             this .txtCardNo.Text  =   "" ;
             this .txtPassword.Text  =   "" ;
             this .label3.Text  =   "" ;
             this .txt.Text  =   "" ;
             this .txt.ReadOnly  =   true ;

             this .isVerified  =   false ;
             this .isWithdraw  =   false ;
             this .isDeposit  =   false ;
             this .isTransfer  =   false ;
             this .isTransfering  =   false ;
             this .isUpdatePassword  =   false ;
        }

         private   void  btnOkPassword_Click( object  sender, System.EventArgs e)
        {
             string  cardNo  =   this .txtCardNo.Text;
             string  password  =   this .txtPassword.Text;
             if  (bank.VerifyCardNo(cardNo, password))
            {
                 this .richTxt.AppendText( " 卡号和口令正确,请执行其他操作!\r\n " );
                 this .isVerified  =   true ;
            }
             else
            {
                 this .richTxt.AppendText( " 卡号或口令错误,请重新输入!\r\n " );
                 this .isVerified  =   false ;
            }
        }

         private   void  txt_TextChanged( object  sender, System.EventArgs e)
        {
             if  ( this .txt.Text  !=   "" )
            {
                 if  ( this .isWithdraw  ||   this .isDeposit  ||   this .isTransfering)
                {
                     try
                    {
                         decimal .Parse( this .txt.Text);
                    }
                     catch  (Exception ex)
                    {
                        MessageBox.Show(ex.Message  +   "  请输入正确的数据格式!\r\n " );
                         this .richTxt.AppendText(ex.Message  +   "  请输入正确的数据格式!\r\n " );
                    }
                }
            }
             else
            {
                MessageBox.Show( " 数据不能为空,请输入数据! " );
                 this .richTxt.AppendText( " 数据不能为空,请输入数据!\r\n " );
            }
        }
    }
}