using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace CommonTypes
{//定义一个接口public interface IAppDll{void DoThing();          }//自定义特性类
    [AttributeUsage(AttributeTargets.Class)]public sealed class CarInfoAttribute : System.Attribute {public string name{ get; set;}       }}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;using System.Windows.Forms;
using CommonTypes;namespace CsharpDll
{[CarInfo(name="这是第三方生产的插件")]public class CsharpModule:IAppDll{public void DoThing()//实现接口中的函数
        {MessageBox.Show("正在调用的是Csharp插件模块");} }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;using System.Reflection;
using CommonTypes;namespace WindowsFormsApplication1
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void openToolStripMenuItem_Click(object sender, EventArgs e){//选择一个插件加载OpenFileDialog OFD = new OpenFileDialog();if (OFD.ShowDialog() == DialogResult.OK) {if (!LoadModule(OFD.FileName))MessageBox.Show("没有成功加载第三方的插件！");}}private bool LoadModule(string path) {bool FindModule = false;Assembly asm = null;try{//加载指定路径下的程序集asm = Assembly.LoadFrom(path);}catch (Exception ex) {MessageBox.Show(ex.Message);return FindModule;}//得到程序集中所有的IAppDll接口兼容的累var ClassTypes = from t in asm.GetTypes()where t.IsClass &&(t.GetInterface("IAppDll") != null)select t;//创建对象，并调用类中的方法foreach (Type t in ClassTypes) {FindModule = true;//使用晚期绑定建立类型,强制转换为接口类型IAppDll someApp =(IAppDll)asm.CreateInstance(t.FullName, true);someApp.DoThing();listBox1.Items.Add(t.FullName);//显示插件的相关信息
                DisplayCarinfo(t);}return FindModule;}//显示插件的信息private void DisplayCarinfo(Type t) {var info = from carAtr in t.GetCustomAttributes(false)where (carAtr.GetType() == typeof(CarInfoAttribute))select carAtr;//显示特性的属性foreach (CarInfoAttribute cia in info) {MessageBox.Show(cia.name);            }}}
}