關于劉冬大俠SPRing.NET系列學習筆記3的一點勘正

誠如他第22樓“只因渴求等待”提出的疑問一樣，他的下面那一段代碼是存在一點點問題的，

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

如果照搬照抄劉冬大俠的這段代碼那是不會成功讀取數據的，竊以為這應該是劉冬大俠故意埋的一雷吧。

根據他的文章，我實踐了一遍：

先創建了幾個類，一個Person類; 一個Man類; 一個Woman類，一共3個類，后面會將根據這個三個類創建xml文檔；

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 + "可以相愛"); 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;        }    }}

接下來就根據上面三個類(隨手寫的)創建xml文檔,

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>

跟著就是XmlFcatory類：

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處調用了：

Program類:

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 + "喜歡抽煙");            p2.Eat(p2.Name + "喜歡旅行");            p1.MakeLove(p2);        }    }}

這是一個完整的實踐，只不過其中的謬誤稍作修改罷了。

修改的代碼如下：

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);                }            );        }

如此才能正常讀取數據。