利用接口实现动态加载类以及 Activator.CreateInstance用法

接口机制实现动态加载类，其中包含 Activator.CreateInstance基本用法示例，有反射的味道

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace InterFaceCreateInstanceDemo
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
            this.cbClass.Items.Add（“InterFaceCreateInstanceDemo.Teacher“）;
            this.cbClass.Items.Add（“InterFaceCreateInstanceDemo.Student“）;
            this.cbClass.SelectedIndex = 0;
        }

        private void btnExe_Click（object sender EventArgs e）
        {
            IPerson p = InitPerson（null）;
            MessageBox.Show（p.GetHello（））;
        }
        public IPerson InitPerson（object objArr）
        {
    

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-01-06 21:10  InterFaceCreateInstanceDemo\
     目录           0  2013-01-06 21:16  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\
     目录           0  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\bin\
     目录           0  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\bin\Debug\
     文件       10240  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\bin\Debug\InterFaceCreateInstanceDemo.exe
     文件       24064  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\bin\Debug\InterFaceCreateInstanceDemo.pdb
     文件       22472  2013-01-06 21:11  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\bin\Debug\InterFaceCreateInstanceDemo.vshost.exe
     文件         490  2010-03-17 22:39  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\bin\Debug\InterFaceCreateInstanceDemo.vshost.exe.manifest
     文件        1209  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Form1.cs
     文件        3181  2013-01-06 21:15  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Form1.Designer.cs
     文件        5817  2013-01-06 21:15  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Form1.resx
     文件        3881  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo.csproj
     文件         943  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo.sln
     文件       36864  2013-01-06 21:30  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo.v11.suo
     文件         212  2013-01-06 21:18  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\IPerson.cs
     目录           0  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\
     目录           0  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\
     文件         863  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6899  2013-01-06 21:16  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件        1010  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.csproj.FileListAbsolute.txt
     文件         975  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.csproj.GenerateResource.Cache
     文件        2209  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.csprojResolveAssemblyReference.cache
     文件       10240  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.exe
     文件         180  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.Form1.resources
     文件       24064  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.pdb
     文件         180  2013-01-06 21:22  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\InterFaceCreateInstanceDemo.Properties.Resources.resources
     目录           0  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\obj\Debug\TempPE\
     文件         508  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Program.cs
     目录           0  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Properties\
     文件        1392  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Properties\AssemblyInfo.cs
     文件        2906  2013-01-06 21:10  InterFaceCreateInstanceDemo\InterFaceCreateInstanceDemo\Properties\Resources.Designer.cs
............此处省略5个文件信息