在.NET中使用域对象持续模式

public class Customer {

　// 私有数据成员

　String _customerId;

　String _companyName;

　String _contactName;

　String _contactTitle;

　public Customer() {}

　// Customer对象的属性

　public String CustomerId {

get { return _customerId; } 

set { _customerId = value;}

　}

　public String CompanyName {

get { return _companyName; } 

set { _companyName = value;}

　}

　public String ContactName {

get { return _contactName; } 

set { _contactName = value;}

　}

　public String ContactTitle {

get { return _contactTitle; } 

set { _contactTitle = value;}

　}

}

public interface ICustomerFactory {

　// 用于单行操作的标准事务方法

　void Load(Customer cust);

　void Insert(Customer cust);

　void Update(Customer cust);

　void Delete(Customer cust);

　// 返回集合的查询方法

　ArrayList FindCustomersByState(String state);

}

public class CustomerFactory : ICustomerFactory

{

　//用于单行操作的标准事务方法

　void Load(Customer cust) { /* Implement here */ }

　void Insert(Customer cust) { /* Implement here */ }

　void Update(Customer cust) { /* Implement here */ }

　void Delete(Customer cust) { /* Implement here */ }

　//返回集合的查询方法

　ArrayList FindCustomersByState(String state) { 

/* 此处是实现代码 */ 

　}

} 

public class NorthwindApp

{

　static void Main (string[] args) {

Customer cust = new Customer();

CustomerFactory custFactory = new CustomerFactory();

//从Northwind数据库载入客户

cust.CustomerId = "ALFKI";

custFactory.load(cust);

// 传递 Customer 对象

FooBar(cust);

// custList是Customer对象列表 

ArrayList custList = custFactory.FindCustomersByState("CA");

　}

}