问题描述
我必须包含在一个IEnumerable<对象的列表;>。
我想设置基于此列表的计数控制的可见性。我曾尝试:
I have a list of objects contained in an IEnumerable<>.I would like to set the visibility of a control based on the count of this list. I have tried:
Visibility="{Binding MyList.Count>0?Collapsed:Visible, Mode=OneWay}"
但是,这并不正常工作。我试着结合MyList.Count在文本块中的文本,以确保计数值是正确的,它是。它只是似乎没有正确设置的知名度。
But this doesn't work. I tried binding MyList.Count to the text in a text block to ensure that the count value was correct, and it is. It just doesn't seem to set the visibility correctly.
推荐答案
您不能使用绑定逻辑或代码表达式(它需要一个的)。无论是使用或触发器,这就是我这样做:
You cannot use logical or code-expressions in bindings (it expects a PropertyPath
). Either use a converter or triggers, which is what i would do:
<YourControl.Style>
<Style TargetType="YourControl">
<Setter Property="Visibility" Value="Collapsed" />
<Style.Triggers>
<DataTrigger Binding="{Binding MyList.Count}" Value="0">
<Setter Property="Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
</YourControl.Style>
的(当然你可以重构的风格融入了的如果你想。)的
(You can of course refactor the style into a resource if you wish.)
这篇关于绑定控件的可视性IEnumerable的“计数”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!