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.nethttp://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。