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}"
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.
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>
(You can of course refactor the style into a resource if you wish.)