设计模式实例-抽象工厂模式

using System;
namespace Ahoo.Demo.DesignPatterns.Patterns.AbstractFactory
{
/*######抽象工厂模式#######
* 提供创建一系列相关/项目依赖对象的接口，
* 无需指定具体子类。
*/
public class Department { }
interface IDepartmentDAL
{
void Insert(Department entity);
Department GetEntity(long Id);
}
/// <summary>
/// 3....
/// </summary>
public class SqlServerDepartment : IDepartmentDAL
{
public void Insert(Department entity)
{
Console.WriteLine("在MS-SQL中插入一条Department记录！");
}
public Department GetEntity(long Id)
{
Console.WriteLine("在MS-SQL中获得一条Department记录！");
return new Department();
}
}
public class MySqlDepartment : IDepartmentDAL
{
public void Insert(Department entity)
{
Console.WriteLine("在MySql中插入一条Department记录！");
}
public Department GetEntity(long Id)
{
Console.WriteLine("在MySql中获得一条Department记录！");
return new Department();
}
}
/// <summary>
/// 1....
/// 抽象工厂接口，包含所有产品创建的抽象方法
/// </summary>
interface IFactory
{
IDepartmentDAL CreateDepartmentDAL();
//IUserDAL CreateUserDAL();
}

/// <summary>
/// 2....
/// 具体实现工厂
/// </summary>
public class SqlServerFactory : IFactory
{
public IDepartmentDAL CreateDepartmentDAL()
{
return new SqlServerDepartment();
}
}

public class Client
{
public static void Excute()
{
IFactory factory = new SqlServerFactory();
IDepartmentDAL dal = factory.CreateDepartmentDAL();
dal.Insert(new Department { });
}
}

/// <summary>
/// 反射技术的改善
/// </summary>
public class DataAccess
{
private static readonly string AssemblyName = "抽象工厂模式";
private static readonly string DB = "SqlServer";
public static IDepartmentDAL CreateDepartmentDal()
{
string className = String.Format("{0}.{1}.{2}", AssemblyName, DB, "DepartmentDAL");
IDepartmentDAL dal = (IDepartmentDAL)Assembly.Load(AssemblyName).CreateInstance(className);
return dal;
}
}
}