MVVM 路由和中继命令 [英] MVVM Routed and Relay Command

问题描述

RoutedCommand 和 RelayCommand ?什么时候使用 RoutedCommand 什么时候使用 RelayCommand 在 MVVM 模式中?

What is the Difference between the RoutedCommand and RelayCommand ? When to use RoutedCommand and when to use RelayCommand in MVVM pattern ?

推荐答案

RoutedCommand 是 WPF 的一部分，而 RelayCommand 是由 WPF 门徒 Josh Smith 创建的；)

RoutedCommand is part of WPF, while RelayCommand was created by a WPF Disciple, Josh Smith ;).

说真的，RS Conley 描述了一些差异.关键区别在于 RoutedCommand 是一个 ICommand 实现，它使用 RoutedEvent 路由通过树，直到找到命令的 CommandBinding，而 RelayCommand 不进行路由，而是直接执行某个委托.在 M-V-VM 场景中，RelayCommand(Prism 中的 DelegateCommand)可能是更好的选择.

Seriously, though, RS Conley described some of the differences. The key difference is that RoutedCommand is an ICommand implementation that uses a RoutedEvent to route through the tree until a CommandBinding for the command is found, while RelayCommand does no routing and instead directly executes some delegate. In a M-V-VM scenario a RelayCommand (DelegateCommand in Prism) is probably the better choice all around.

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