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。