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引言
接下来的是Commanding Demo的改造.
DelegateCommand
WPF本身提供了一个RoutedCommand,然而没什么卵用.在Prism框架中提供了个更人性化的ICommand的实现--DelegateCommand,如下
public class ArticleViewModel : NotificationObject { private readonly ICommand showArticleListCommand; public ArticleViewModel(INewsFeedService newsFeedService, IRegionManager regionManager, IEventAggregator eventAggregator) { this.showArticleListCommand = new DelegateCommand(this.ShowArticleList); } public ICommand ShowArticleListCommand { get { return this.showArticleListCommand; } } }
CompositeCommand
CompositeCommand是Prism提供的一个组合式命令实现.它可以在子命令都可用的情况下同时执行多个子命令.应用情况不是很多,但是可以了解一下.如下
public class MyViewModel : NotificationObject { private readonly CompositeCommand saveAllCommand; public ArticleViewModel(INewsFeedService newsFeedService, IRegionManager regionManager, IEventAggregator eventAggregator) { this.saveAllCommand = new CompositeCommand(); this.saveAllCommand.RegisterCommand(new SaveProductsCommand()); this.saveAllCommand.RegisterCommand(new SaveOrdersCommand()); } public ICommand SaveAllCommand { get { return this.saveAllCommand; } } }
示例源码
http://pan.baidu.com/s/1sjuWkod
小结
更多的Commandi用法可以在官方文档Prism 4.0的Chapter 9中查阅.
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原文地址:http://www.cnblogs.com/caizl/p/4676629.html