Asp.Net工厂模式--工厂类的获取

工厂模式是基本的设计模式之一，我们在开发XueBa UI的过程中，对BLL层进行了工厂化的包装

namespace XueBa.SqlServer
{
    public class Factory
    {
        public DocumentManager DocumentManager { get; private set; }
        public QuestionManager QuestionManager { get; private set; }
        public TagManager TagManager { get; private set; }
        private static Factory instance = null;

        private static object loc = new object();

        private Factory() 
        {
            DocumentManager = new DocumentManager();
            QuestionManager = new QuestionManager();
            TagManager = new TagManager();
        }

        public static Factory getInstance()
        {
            lock (loc)
            {
                if (instance == null)
                {
                    instance = new Factory();
                }
            }
            return instance;
        }
    }
}

那么，该如何使得每个Asp.Net页面都能够获得Factory类呢？我采用了重载System.Web.UIControls.Page基类的方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using XueBa.SqlServer;

/// <summary>
/// 所有asp.net页面的基类
/// </summary>
public class BasePage : System.Web.UI.Page
{

    public Factory Factory
    {
        get
        {
            return Factory.getInstance();
        }
    }
}

这样，让每个页面继承BasePage类，就可以实现对工厂类的访问了