上一篇介绍了Web Parts基础,如果两个Web Part之间不能通讯,那就相当郁闷的,所以Asp.Net提供了两种方式来使得Web Part之间可以互相通讯,一种是静态通讯方式,另一种时使用ConnectionZone进行动态通讯。(这里所谓的“Web Part通讯”是指多个WebPart中用户控件之间的通讯)。下面是Web Parts直接进行通讯的模型:
我在学习过程中,通过实例--根据我的Blog的RSS来搜索文章--来演示Web Part之间的静态通讯。运行结果如下所示(没有进行界面美化^_^):
起始页面:
以"struct"作为关键字搜索的结果页面:
页面中放了两个Web Part,第一个WebPart中包含一个由文本框和按钮组成的用户控件Search(这里用的是用户控件,而不是直接在WebPart放置文本框和按钮,如果直接放的话每个控件都有个标题条TitleBar,感觉太别扭);第二个WebPart中负责显示搜索结果,也是包含一个用户控件Content,Content控件包含0个或多个动态添加的Label。下面是设计Web Parts间进行通讯的步骤:
1. 创建消息接口:定义一个IMessage接口
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2. 通讯提供者(Provider):
这个示例中,第一个WebPart中的用户控件Search作为通讯提供者,因此我们定义Search控件的代码如下:
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3. 通讯订阅者(Consumer):
这个示例中,第而个WebPart中的用户控件Content作为消息订阅者,因此我们定义该控件的代码如下:
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4. 在页面*.aspx的WebPartManager中注册提供者和订阅者:
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附:完整源码下载https://files.cnblogs.com/happyhippy/WebPartDemo.rar