AbstractFactory 模式

//问题描述：操作数据库。数据库可能是Access、SQL等。以操作用户信息、部门信息为例。
//可能在任意数据库中操作。
//User类；Department类； IUser，UserOperAccess，UserOperSQL；
//IDep，DepOperAccess，DepOperSQL；
//DataAccess：创建出操作类型
//通过配置文件来管理（通过反射机制动态加载）要创建的操作类型。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Configuration;

namespace AbstractFactory
{
    public class User                //user info
    {
        private string name;
        private int id;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        public int Id
        {
            get { return id; }
            set { id = value; }
        }
    }
    public class Department          //department info
    {
        private string depName;
        private int num;

        public string DepName
        {
            get { return depName; }
            set { depName = value; }
        }
        public int Num
        {
            get { return num; }
            set { num = value; }
        }
    }

    public interface IUserOper      //user operation
    {
        void Insert(User user);
        void GetName(int id);
    }
    public class UserOperSQL : IUserOper
    {
        public void Insert(User user)
        {
            Console.WriteLine("Insert  user info into SQL ");
        }
        public void GetName(int id)
        {
            Console.WriteLine("Get user info from SQL");
        }
    }
    public class UserOperAccess : IUserOper
    {
        public void Insert(User user)
        {
            Console.WriteLine("Insert user info into Access");
        }
        public void GetName(int id)
        {
            Console.WriteLine("Get user info from Access");
        }
    }
    public interface IDepartOper   //department operation
    {
        void Insert(Department dep);
        void GetName(int num);
    }
    public class DepOperSQL : IDepartOper
    {
        public void Insert(Department dep)
        {
            Console.WriteLine("Insert department info into SQL ");
        }
        public void GetName(int num)
        {
            Console.WriteLine("Get department info from SQL ");
        }
    }
    public class DepOperAccess : IDepartOper
    {
        public void Insert(Department dep)
        {
            Console.WriteLine("Insert department info into Access ");
        }
        public void GetName(int num)
        {
            Console.WriteLine("Get department info from Access ");
        }
    }
    public class DataAccess
    {
        public static readonly string AssemblyName = "AbstractFactory";
        public static readonly string dbName = ConfigurationManager.AppSettings["DB"];

        public static IUserOper CreateUserOper()       //创建用户操作：  Access、 SQL 等
        {
            string userName = AssemblyName + "." + "UserOper" + dbName;
            return (IUserOper)Assembly.Load(AssemblyName).CreateInstance(userName);
        }
        public static IDepartOper CreateDepOper()      //创建部门操作：  Access、 SQL 等
        {
            string depName = AssemblyName + "." + "DepOper" + dbName;
            return (IDepartOper)Assembly.Load(AssemblyName).CreateInstance(depName);
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            User u1 = new User();
            Department d1 = new Department();

            IUserOper iu = DataAccess.CreateUserOper();
            iu.Insert(u1);
            iu.GetName(1);

            IDepartOper id = DataAccess.CreateDepOper();
            id.Insert(d1);
            id.GetName(1);

            Console.Read();
        }
    }
}
//配置文件内容：App.config
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="DB" value="SQL"/>         //可更换
  </appSettings>
</configuration>