将 Button 的可见性绑定到 ViewModel 中的 bool 值 [英] Binding a Button's visibility to a bool value in ViewModel

问题描述

如何将按钮的可见性绑定到 ViewModel 中的 bool 值?

How do I bind the visibility of a button to a bool value in my ViewModel?

<Button Height="50" Width="50" Style="{StaticResource MyButtonStyle}"
    Command="{Binding SmallDisp}" CommandParameter="{Binding}" Cursor="Hand"
    Visibility="{Binding Path=AdvancedFormat}" />

推荐答案

假设 AdvancedFormat 是一个 bool，你需要声明并使用一个 BooleanToVisibilityConverter:

Assuming AdvancedFormat is a bool, you need to declare and use a BooleanToVisibilityConverter:

<!-- In your resources section of the XAML -->
<BooleanToVisibilityConverter x:Key="BoolToVis" />

<!-- In your Button declaration -->
<Button
 Height="50" Width="50"
 Style="{StaticResource MyButtonStyle}"
 Command="{Binding SmallDisp}" CommandParameter="{Binding}" 
Cursor="Hand" Visibility="{Binding Path=AdvancedFormat, Converter={StaticResource BoolToVis}}"/>

注意添加的Converter={StaticResource BoolToVis}.

这是使用 MVVM 时非常常见的模式.从理论上讲，您可以自己在 ViewModel 属性上进行转换(即，只需将属性本身设为 Visibility 类型)，尽管我不希望这样做，因为现在您是搞乱关注点的分离.项目的可见性应该真正取决于视图.

This is a very common pattern when working with MVVM. In theory you could do the conversion yourself on the ViewModel property (i.e. just make the property itself of type Visibility) though I would prefer not to do that, since now you are messing with the separation of concerns. An item's visbility should really be up to the View.

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