附件

    通过访问配置文件，根据抽象类型动态加载实体类型实例 ：

///C# 测试用的抽象类型
    interface IPerson { }
///C# 测试用的实体类型
    class Student : IPerson { }
class Employee : IPerson { }
///App.Config
///在配置文件中增加独立的配置节，并登记相关的实体类型信息
QualifiedTypeName方式：  Quanlified Class Name, Assembly Name
<configuration>
<configSections>
<section name ="DemoSection" type="System.Configuration.NameValueSectionHandler, 
   System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
</configSections>
<DemoSection>
<add key="student" value="VisionTask.Training.ServicePattern.ConfigurationDynamics.
  UnitTest.Student, ConfigurationDynamics.UnitTest"/>
<add key="employee" value="VisionTask.Training.ServicePattern.ConfigurationDynamics.
  UnitTest.Employee, ConfigurationDynamics.UnitTest"/>
</DemoSection>
</configuration>
///C# UnitTest
using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Configuration;
using System.Diagnostics;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace VisionTask.Training.ServicePattern.ConfigurationDynamics.UnitTest
{
[TestClass]
public class TestLoadConfiguration
{
[TestMethod]
public void Test()
{
NameValueCollection items =
(NameValueCollection)(ConfigurationManager.GetSection("DemoSection"));
Assert.IsNotNull(items);
IPerson person;
foreach (string key in items.Keys)
{
string typeName = items[key];
person = (IPerson)(Activator.CreateInstance(Type.GetType(typeName)));
}
}
}
}