看了一段时间的#develop,首先接触到的就是程序的插件架构。园子里也有许多不错的资料可以学习。随时把自己的认识写下来和大家交流,无疑会有很大帮助。闲话就不说了,进入正题。
说到插件架构,首先要有一个整体印象,到底什么才是插件架构?这个问题的答案很好找,找个插件架构的程序看看就可以了,比如VS,MyIE,再比如千千静听。我们可以开发不同功能的插件,加载到宿主程序上,功能就能发挥作用。宿主程序呢,完全不知道我们到底什么样的功能,怎么实现的。这里呢,我想从我们平常写程序时引用一些类库说起。我们经常会把一些功能封装到一个dll中,然后在其他项目中引用,引用时,直接调用其中的方法就ok了。Dll是编译过的,方法名是我们自己知道的,无论是自己写的dll,还是引用别人的,总之,我们一定知道我们调用的什么方法。试想一下,如果我们加一个约定,约定了这个dll中的方法名,那这个时候,这个dll的客户程序是不是不用管是什么dll,只要调用约定的方法就可以了?那再想一下,这个dll非得引用吗?动态加载行不行?当然行,加载之后,去调用约定的方法,完全可以。到这里,我们发现,其实只要一个约定,客户程序完全不需要去在意它的服务者是什么样的状态,exe也好dll也好,只要能提供契约里的方法就ok了,它只关心有没有这么一个方法可以调用。至此,发现这不就是最最简单的一个插件架构的样子吗?
接下来,赶紧动手写个例子试一下:
首先,定义一个契约,这里采用了接口,那最好再来一个实现该接口的抽象类,如下
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接下来,写宿主程序,宿主程序肯定要先加载实现了IPlugIn的插件,然后调用其约定的方法。在.Net里无非就是反射一下就ok了,看代码:
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代码地址:https://files.cnblogs.com/Pcant/SimplePlug-in.rar (待续)
园子里相关资源推荐:
http://www.cnblogs.com/guanjinke/archive/2007/03/14/675109.html
http://www.cnblogs.com/wayfarer/articles/28537.html