一个简单的插件框架示例

闲言不讲，直接上代码，如下三个文件，分属三个项目。

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Runtime.Remoting.Lifetime;

using System.Text;

using Contract;

namespace Application

{

    class Program

    {

        /// <summary>  

        /// 构建一个AppDomainSetup实例  

        /// 用于启用卷影复制并设置基本路径  

        /// </summary>  

        public static AppDomainSetup CreateAppDomainSetup()

        {

            AppDomainSetup setup = new AppDomainSetup();

            setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;

            setup.ShadowCopyFiles = "true";

            return setup;

        }

        /// <summary>  

        /// 从当前目录下的指定的程序集文件中加载指定的类型  

        /// </summary>  

        public static object CreateAndUnwrap(AppDomain appDomain, string assemblyFile, string typeName)

        {

            string fullName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, assemblyFile);

            return appDomain.CreateInstanceFromAndUnwrap(fullName, typeName);

        }

        static void Main()

        {

            Console.WriteLine("Current AppDomain:{0}",

                AppDomain.CurrentDomain.FriendlyName);

            AppDomainSetup setup = CreateAppDomainSetup();

            //建立准备加载插件的AppDomain  

            AppDomain secAppDomain = AppDomain.CreateDomain("SecAppDomain", null, setup);

            //忽略新建立的AppDomain里面的调用租约管理  

            secAppDomain.DoCallBack(delegate

            {

                LifetimeServices.LeaseTime = TimeSpan.Zero;

            });

            IAddin addinOne = (IAddin)CreateAndUnwrap(

                                           secAppDomain, "Implement.dll", "Implement.AddinOne");

            Console.WriteLine(addinOne.Run("Test"));

            //卸载装入插件的AppDomain  

            AppDomain.Unload(secAppDomain);

            //由于插件所在的AppDmain已被卸载，所以以下的执行会出现异常  

            try

            {

                Console.WriteLine(addinOne.Run("Test"));

            }

            catch (Exception ex)

            {

                Console.WriteLine("发生调用异常：" + ex.Message);

            }

            Console.ReadLine();

        }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Contract

{

        public interface IAddin

        {

            string Run(string paramString);

        }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Contract;

namespace Implement

{

  

 

 

    public class AddinOne:MarshalByRefObject,IAddin  

    {  

        public string Run(string paramString)  

        {  

            const string resultString =  

                "Current AppDomain:{0},Param String:{1}!";  

 

            return string.Format(  

                resultString,  

                AppDomain.CurrentDomain.FriendlyName,  

                paramString);  

        }  

    }  

 

}