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 Settings\Administrator\桌面\IocEasy\IocEasy\Object.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。