WPF触发器结合MVVM财产 [英] WPF Trigger binding to MVVM property

问题描述

我有一个包含我想隐藏如果在一个视图模型的一个的属性值是true图像一个DataTemplate。谁能告诉我，为什么下面的XAML不起作用？

 ＆lt;图像X：NAME =IMG来源=.. \\影像\\ List_16.png保证金=0,0,5,0＆GT;
  ＆LT; Image.Style＆GT;
    ＆LT;样式和GT;
      ＆LT; Style.Triggers＆GT;
        ＆LT; D​​ataTrigger绑定={结合CurrentListHasPendingChanges}VALUE =真＆GT;
          ＆LT; setter属性=Image.VisibilityVALUE =隐藏/＆GT;
        ＆LT; / DataTrigger＆GT;
        ＆LT; D​​ataTrigger绑定={结合CurrentListHasPendingChanges}VALUE =FALSE＆GT;
          ＆LT; setter属性=Image.VisibilityVALUE =可见/＆GT;
        ＆LT; / DataTrigger＆GT;
      ＆LT; /Style.Triggers>
    ＆LT; /样式和GT;
  ＆LT; /Image.Style>
＆LT; /图像＆GT;
 

解决方案

这不就是

 ＆LT; setter属性=能见度VALUE =隐藏/＆GT;
 

我假设你使用INotifyProptyChanged。

修改我做了一些谷歌搜索，我认为你需要使用某种模板，以使触发器的工作。

例如：的http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/ae2dbfb7-5dd6-4352-bfa1-53634289329d

<一个href=\"http://www.thejoyof$c$c.com/Help%5FWhy%5Fcant%5FI%5Fuse%5FDataTriggers%5Fwith%5Fcontrols%5Fin%5FWPF.aspx\" rel=\"nofollow\">http://www.thejoyof$c$c.com/Help%5FWhy%5Fcant%5FI%5Fuse%5FDataTriggers%5Fwith%5Fcontrols%5Fin%5FWPF.aspx

I have a datatemplate containing an image that I want to be hidden if the the value of a property in a ViewModel is true. Can anyone tell me why the the xaml below does not work?

<Image x:Name="img" Source="..\Images\List_16.png" Margin="0,0,5,0">
  <Image.Style>
    <Style>
      <Style.Triggers>
        <DataTrigger Binding="{Binding CurrentListHasPendingChanges}" Value="True">
          <Setter Property="Image.Visibility" Value="Hidden" />
        </DataTrigger>
        <DataTrigger Binding="{Binding CurrentListHasPendingChanges}" Value="False">
          <Setter Property="Image.Visibility" Value="Visible" />
        </DataTrigger>
      </Style.Triggers>
    </Style>
  </Image.Style>
</Image>

解决方案

isn't that

<Setter Property="Visibility" Value="Hidden" />

?

I assume you use INotifyProptyChanged.

EDIT I did some Googling and I think you need to use some sort of template in order to make the trigger work.

eg.: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/ae2dbfb7-5dd6-4352-bfa1-53634289329d

http://www.thejoyofcode.com/Help%5FWhy%5Fcant%5FI%5Fuse%5FDataTriggers%5Fwith%5Fcontrols%5Fin%5FWPF.aspx

这篇关于WPF触发器结合MVVM财产的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！