炸弹和土匪引用(转)

it2022-05-09  32

   我来设计一个例子,我在D目录运行程序A(土匪)。然后望D目录丢文件(炸弹)过去,土匪判断该文件是否炸弹(包含实现了接口IBomb的类),如果是,则执行IBomb的Explode方法让炸弹爆炸,当然炸了以后就没有了,文件将被删除。     接口定义--编译为Interface.dll供炸弹和土匪引用。

C# code using System; namespace Interface { public interface IBomb { void Explode(); } }

炸弹定义--编译为ClassLibrary1.dll,准备交给土匪

C# code using System; namespace ClassLibrary1 { public class Class1:Interface.IBomb { public void Explode() { Console.WriteLine( " bo~~~ " ); } } }

那么程序A,引爆炸弹而且能把炸弹扔掉的土匪--编译为AppDomainTest.exe

C# code using System; using System.Reflection; namespace AppDomainTest { /// <summary> /// 动态装卸dll程序集示例 /// 这里用一个有趣的例子: /// /// 我把一个dll看作是炸弹,执行如下操作 /// 1、炸弹扔到程序运行目录中 /// 2、引爆炸弹 /// 3、炸弹消失 /// /// /// </summary> class Program { /// <summary> /// 使用FileSystemWatcher监视炸弹,如果有则引爆 /// </summary> /// <param name="args"></param> static void Main( string [] args) { Console.WriteLine( " Press Any Key To Exit ... " ); System.IO.FileSystemWatcher fsWatcher = new System.IO.FileSystemWatcher(); fsWatcher.Path = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location); fsWatcher.Filter = " *.dll " ; fsWatcher.EnableRaisingEvents = true ; fsWatcher.Created += new System.IO.FileSystemEventHandler(fsWatcher_Created); Console.ReadKey(); } /// <summary> /// 如果有炸弹丢过来则引爆 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> static void fsWatcher_Created( object sender, System.IO.FileSystemEventArgs e) { InvokeExplode(e.FullPath); } /// <summary> /// 不能炸着自己,创建一个AppDomain... /// </summary> /// <param name="fileName"></param> public static void InvokeExplode( string fileName) { try { System.AppDomain app = System.AppDomain.CreateDomain(System.IO.Path.GetFileNameWithoutExtension(fileName)); System.Runtime.Remoting.ObjectHandle objLoader = app.CreateComInstanceFrom(System.Reflection.Assembly.GetExecutingAssembly().Location, " AppDomainTest.RemoteLoader " ); RemoteLoader loader = objLoader.Unwrap() as RemoteLoader; loader.InvokeExplode(fileName); System.AppDomain.Unload(app); System.IO.File.Delete(fileName); } catch (Exception ex) { Console.WriteLine(ex.Message); } } } /// <summary> /// 在这里爆炸,注意这里的Assembly不能被外面访问 /// </summary> class RemoteLoader : MarshalByRefObject { public void InvokeExplode( string fileName) { Assembly assembly = Assembly.LoadFile(fileName); foreach (System.Type type in assembly.GetTypes()) { if (type.GetInterface( typeof (Interface.IBomb).FullName) != null ) { object obj = assembly.CreateInstance(type.FullName, true ); ((Interface.IBomb)obj).Explode(); } } } } }

--这三个文件怎么呢?第一个不能玩,是给第二个和第三个引用的。 运行AppDomainTest.exe,然后把ClassLibrary1.dll扔到该运行目录。你应该看到如下输出之后ClassLibrary1.dll会自动消失。

Assembly code Press Any Key To Exit ... bo~~~

如果把ClassLibrary1.dll改为

C# code using System; namespace ClassLibrary1 { public class Class1:Interface.IBomb { public void Explode() { Console.WriteLine( " bo~~~ " ); } } public class Class2 : Interface.IBomb { public void Explode() { Console.WriteLine( " 乒~~~~乓~~~ " ); } } }

扔到正在运行AppDomainTest.exe的目录中,AppDomainTest.exe将会输出

Assembly code Press Any Key To Exit ... bo~~~ bo~~~ 乒~~~~乓~~~

感兴趣就玩玩吧,注意assembly这玩艺可是请神容易送神难:p

转载于:https://www.cnblogs.com/hengbo/archive/2009/08/12/2232489.html

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