关于刘冬大侠Spring.NET系列学习笔记3的一点勘正

诚如他第22楼“只因渴求等待”提出的疑问一样，他的下面那一段代码是存在一点点问题的，

XElement root = XElement.Load(fileName);
            var objects = from obj in root.Elements("object") select obj;

如果照搬照抄刘冬大侠的这段代码那是不会成功读取数据的，窃以为这应该是刘冬大侠故意埋的一雷吧。

根据他的文章，我实践了一遍：

先创建了几个类，一个Person类; 一个Man类; 一个Woman类，一共3个类，后面会将根据这个三个类创建xml文档；

Person:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IocEasy
{
    public class Person
    {
        public string Name { get; set; }
        public string Sex { get; set; }

        public Person()
        {
        }

        public void Eat(string something)
        {
            Console.WriteLine(something);
        }

        public void MakeLove(Person person)
        {
            switch (person.Sex)
            {
                case "男": Console.WriteLine(this.Name + "和" + person.Name + "只能搞基"); break;
                case "女": Console.WriteLine(this.Name + "和" + person.Name + "可以相爱"); break;
                default: break;
            }
        }

    }
}

Man:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IocEasy
{
    public class Man : Person
    {
        public Man()
        {
        }

        public Man(string name, string sex)
        {
            base.Name = name;
            base.Sex = sex;
        }
    }
}

Woman:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IocEasy
{
    public class Woman : Person
    {
        public Woman()
        {
        }

        public Woman(string name, string sex)
        {
            base.Name = name;
            base.Sex = sex;
        }
    }
}

接下来就根据上面三个类(随手写的)创建xml文档,

Object.xml:

<?xml version="1.0" encoding="utf-8" ?>


<objects xmlns="http://www.springframework.net"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.net
        http://www.springframework.net/xsd/spring-objects.xsd">
  <object id="Person" type="IocEasy.Person,IocEasy" ></object>
  <object id="Man" type="IocEasy.Man,IocEasy" ></object>
  <object id="Woman" type="IocEasy.Woman,IocEasy" ></object>

</objects>

跟着就是XmlFcatory类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using System.Data;
using System.Xml;

namespace IocEasy
{
    public class XmlFactory
    {
        private IDictionary<string, object> objectDefine = new Dictionary<string, object>();

        public XmlFactory(string fileName) 
        {
            InstanceObjects(fileName);
        }

        private void InstanceObjects(string fileName)
        {
            XNamespace ns = "http://www.springframework.net";
            XName name = ns + "object";
            XElement root = XElement.Load(fileName);            
            var objects = from obj in root.Elements(name) select obj;
            objectDefine = objects.ToDictionary(
                k => k.FirstAttribute.Value,
                v =>
                {
                    string typeName = v.Attribute("type").Value;
                    Type type = Type.GetType(typeName);
                    return Activator.CreateInstance(type);
                }
            );
        }

        public object GetObject(string id)
        {
            object result = null;
            if (objectDefine.ContainsKey(id))
            {
                result = objectDefine[id];
            }
            return result;
        }

    }
}

最后在就是主程序入口处调用了：

Program类:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IocEasy
{
    class Program
    {
        static void Main(string[] args)
        {
            AppRegister();
            Console.ReadLine();
        }

        static void AppRegister()
        {
            XmlFactory ctx = new XmlFactory(@"C:Documents and SettingsAdministrator桌面IocEasyIocEasyObject.xml");
            Person p1 = ctx.GetObject("Man") as Person;
            p1.Name = "Euler";
            p1.Sex = "男";
            Person p2 = ctx.GetObject("Woman") as Person;
            p2.Name = "Echo";
            p2.Sex = "女";

            p1.Eat(p1.Name + "喜欢抽烟");
            p2.Eat(p2.Name + "喜欢旅行");

            p1.MakeLove(p2);
        }
    }
}

这是一个完整的实践，只不过其中的谬误稍作修改罢了。

修改的代码如下：

private void InstanceObjects(string fileName)
        {
            XNamespace ns = "http://www.springframework.net";
            XName name = ns + "object";
            XElement root = XElement.Load(fileName);            
            var objects = from obj in root.Elements(name) select obj;
            objectDefine = objects.ToDictionary(
                k => k.Attribute("id").Value,//k.FirstAttribute.Value,
                v =>
                {
                    string typeName = v.Attribute("type").Value;
                    Type type = Type.GetType(typeName);
                    return Activator.CreateInstance(type);
                }
            );
        }

如此才能正常读取数据。